TRAN TAN VIET - Academia.edu (original) (raw)

Papers by TRAN TAN VIET

Science & Technology Development Journal - Engineering and Technology

The outbreak and prolonged COVID-19 pandemic has caused a population decline as well as a profoun... more The outbreak and prolonged COVID-19 pandemic has caused a population decline as well as a profound impact on the global economy, the COVID virus spreads highly in the air through the process of sneezing, contact leads to many dangers to the health and safety of people around the world. Many simulation studies have been carried out to predict the risk of spread, as well as to find solutions to limit the infection when spreading sneeze droplets in the air. In this study, the motion and distribution of droplets containing coronaviruses emitted by coughing or sneezing in the isolation room at Ho Chi Minh City, Vietnam National University were investigated using ANSYS Fluent software. The airflow in the isolation room was simulated by a 3D turbulence model and energy equation using the finite volume method (FVM) with a domain of isolation room solved for appropriate boundary conditions. The effect of ventilation airflow speed and the size of droplets on the distribution of particles in t...

IOP Conference Series: Earth and Environmental Science

In the present study, we conduct the numerical simulation for a large-scale tunnel drying kiln in... more In the present study, we conduct the numerical simulation for a large-scale tunnel drying kiln in a brick factory performance by Ansys Fluent software. The airflow in the dryer was simulated by three-dimensional turbulence model with a domain of tunnel drying kiln is solved for appropriate boundary conditions. The velocity and temperature distribution of the dryer using the Realizable k–ε model. The CFD model is used to simulate the steady stage heat transfer and airflow within the dryer. In addition, the the meshing method for the dryer was investigated and show the influences on both air temperature distribution and air velocity distribution inside the dryer. From the simulation, the highest and the lowest temperature are 1025 K and 670 K respectively.

Chemical engineering transactions, 2021

A continuous process flowsheet for biodiesel production from crude castor oil and methanol was de... more A continuous process flowsheet for biodiesel production from crude castor oil and methanol was developed on Aspen HYSYS simulation environment. It consists of an acid-catalysed sub-process for pre-treatment of the crude feedstock and a base-catalysed one for trans-esterification of treated oil. Reactions involved were defined using kinetic parameters obtained from lab-scale experiments for increased realism, and reactor setup was decided based on basic technological and economical assessments. Specifications of other unit operations and flows were obtained from different approximation methods, literature adaptation and trade-off consideration. Input and output quality controls were achieved via simple adjustments with tight tolerances. The use of crude feedstock reduced the cost of raw material while expanding the scale of the process, which managed to produce 8000 tons of biodiesel having purity of over 99 % a year. Specifically, the process could remove up to 90.83 % amount of fre...

Chemical engineering transactions, 2021

Spraying herbicide, followed by burning, is a common practice for clearing pineapple residues (le... more Spraying herbicide, followed by burning, is a common practice for clearing pineapple residues (leaves and stems) and preparing subsequent cultivation crops in the Mekong Delta, Vietnam. This is an unsustainable agricultural practice that causes environmental pollution. In this study, pilot-scale pineapple residue composting was studied at Tan Phuoc district, Tien Giang province. Approximately 5.5 t of pineapple leaves and stems were mixed with 10 wt% food waste and 0.1 % v/w effective microorganisms. Chopped pineapple residues and food waste were distributed in layers in sequence and sprayed with the microorganism solution. Composting was carried out in a pyramid-shaped pile with a bottom diameter of approximately 5 m and a height of about 1.5 m. The composting temperatures were monitored daily using a digital thermometer. The composting mixture was withdrawn, mixed thoroughly and then re-distributed to the composting pile every 3 d. Composting was performed after 45 d when the comp...

Chemical engineering transactions, 2021

This study investigates internal conditions of the solar greenhouse dryer with drying agricultura... more This study investigates internal conditions of the solar greenhouse dryer with drying agricultural products. The operating conditions inside the solar greenhouse dryer were analysed by ANSYS Fluent software using mathematical models. Additionally, the moist air outside changed according to the climatic conditions of the day. Specifically, moist air enters the dryer through two front doors and exits through three exhaust fans installed in the back, and the flow was considered unstable and tumultuous. Agricultural products inside the solar greenhouse dryer were modelled as a porous material, and the radiation was modelled according to the radiation model. The simulation results show the distribution of temperature and humidity inside the solar drying greenhouse by the influence of heat exchange, turbulent flow, and the process of removing moisture from the drying material to the outside. The simulation results show that indoor drying temperature ranges from 303.15 K to 323.1 K at each...

MATERIALS TRANSACTIONS, 2020

Every year, trillions of cigarette butts (CB) are discarded all over the world without being recy... more Every year, trillions of cigarette butts (CB) are discarded all over the world without being recycled, thus causing negative impacts on the ecological environment as well as the health of living species. Cellulose acetate (CA), the main component of cigarette butts, is a valuable polymer for numerous applications. For the first time, by using a cost-effective freeze-drying method in the presence of polyvinyl alcohol (PVA) as a cross-linker, high-value engineering cellulose acetate aerogels were successfully fabricated from CB. The effects of component concentrations on the morphology of the CA aerogels were investigated by changing concentration of CA fibers (13.0 wt.%) and PVA (0.1 1.0 wt.%). The CA aerogels exhibited an extremely low density (25.445.6 mg/cm 3), a high porosity (96.4698.01%), and a low thermal conductivity (0.0340.039 W/(m + K)). The modified CA aerogels also expressed a great capacity of oil absorption (11.8225.22 g/g). Hence, the CA aerogel is a promising material for future uses in thermal insulation and oil spill treatment.

IOP Conference Series: Materials Science and Engineering, 2020

This work is to implement a working model of an integrated process for bioethanol in the process ... more This work is to implement a working model of an integrated process for bioethanol in the process simulation based on rigorous model using the Aspen HYSYS simulation software. As a case study, the simulation is applied to design a pilot plant that converts rice straw into ethanol. The model is based on the process for biochemical conversion of lignocellulosic biomass (rice straw) to ethanol, proposed by the pilot plant of producing bio-ethanol with capacity of 152 kg rice straw/batch. The plant for manufacturing bio-ethanol with rice straw as raw materials comprises basically three units: Pretreatment of rice straw by alkaline treatment; Simultaneous saccharification fermentation (SSF) of rice straw to produce bio-ethanol and the unit for separation and purification of bio-ethanol mixture from simultaneous and fermentation unit. Modeling of rice straw feedstock as a solid material in Aspen HYSYS, including the creation of necessary hypothetical components. Investigate and analyze the...

Science and Technology Development Journal, 2016

Finding alternative energy sources for fossil fuels was a global matter of concern, especially in... more Finding alternative energy sources for fossil fuels was a global matter of concern, especially in developing countries. Rice husk, an abundant biomass in Viet Nam, was used to partially replace fossil fuels by gasification process. The study was conducted on the pilot plant fixed bed up-draft gasifier with two kind of gasification agents, pure air and air-steam mixture. Mathematical modeling and computer simulations were also used to describe and optimize the gasification processes. Mathematical modeling was based on Computational Fluid Dynamics method and simulation was carried by using Ansys Fluent software. Changes in outlet composition of syngas components (CO, CO2, CH4, H2O, H2) and temperature of process, in relation with ratio of steam in gasification agents, were presented. Obtained results indicated concentration of CH4, H2 in outlet was increased significantly when using air-steam gasification agents than pure air. The discrepancies among the gasification agents were deter...

Science and Technology Development Journal, 2016

This paper reports the production of fatty acid methyl esters (FAMEs) and fatty acid ethyl esters... more This paper reports the production of fatty acid methyl esters (FAMEs) and fatty acid ethyl esters (FAEEs) by the transesterification reaction of rubber seed oil (RSO) in supercritical methanol and ethanol without using any catalyst. Experiment were carried out in a batch reactor, and reactions were studied at 260, 280, 300 and 320 oC at a pressure of 8.1-19 MPa with various mole ratios of ethanol – to - methanol from 0 to 100%. The extent of the reaction was explored using a convertibility parameter, which corresponds to the maximum ester content attainable from the feedstock. The highest FAME and FAEE contents achieved were 91.8 % and 86.4%, respectively. Results show that transesterification of RSO in methanol was more efficient than that in ethanol; the temperature had the strongest influence.

Science and Technology Development Journal, 2015

BHD (Bio hydrofined diesel) was synthesized from animal fat and vegetable oil by hydrodeoxygenati... more BHD (Bio hydrofined diesel) was synthesized from animal fat and vegetable oil by hydrodeoxygenation with CoMo/TiO2 catalyst. To improve the quality and the quantity of BHD, the synthesis co-doping of Ni, Cu on CoMo/TiO2 catalyst and catalytic performance were investiagated. The catalytic performance of various Ni, Cu- CoMo/TiO2 catalysts were studied for the hydrodeoxygention reaction at a range of temperature 300-350 oC. Compared with the hydrodeoxygention reaction with CoMo/TiO2 catalyst, the cetane number of BHD and the conversion reaction were higher when the co-doping catalyst was used. In addition, the quantity of BHD was increased 3-5 % vol when the hydrodeoxygenation reaction was done with co-doping Cu-CoMo/TiO2 catalyst.

Fuel, 2012

Hydrocracking of vacuum residue with activated carbon was conducted in a batch reactor with two t... more Hydrocracking of vacuum residue with activated carbon was conducted in a batch reactor with two types of supercritical hydrocarbon solvents, aromatic hydrocarbons (m-xylene and toluene) and normal alkane hydrocarbons (n-hexane and n-dodecane). The supercritical reactions were performed at 400°C with H 2 partial pressures of 3.45 MPa and 6.89 MPa. The supercritical hydrocarbon solvent affected the levels of conversion and coke formation as well as the distribution of oil products (naphtha, middle distillate, vacuum gas oil, and residue). The mass ratio of each oil product to the unreacted residue differed among the supercritical solvents. Compared to the product profile in n-alkane solvents, aromatic solvents yielded much smaller naphtha fractions and larger middle distillate fractions. An increase of surface acidity of the activated carbon led to the conversion improvement observed in the supercritical reactions. However, the increased partial pressure of hydrogen was not associated with significant changes in conversion. High conversion (69.2 wt.%) with low coke (13.5 wt.%), and high quality oil products (13.0 wt.% of naphtha, 34.9 wt.% of middle distillate, 27.1 wt.% of vacuum gas oil, and 11.2 wt.% of residue) could be obtained with supercritical m-xylene and acid-treated activated carbon.

IOP Conference Series: Earth and Environmental Science, 2021

This study shows the method for predicting the temperature distribution and air flow in the box o... more This study shows the method for predicting the temperature distribution and air flow in the box of a refrigerated container 40 feet, for two configurations (open and closed) of the rear door. Computational Fluid Dynamics – CFD (Computational Fluid Dynamics) is decoupled and used when the truck door is fully closed. The temperature, velocity vector and heat flow are simulated based on the finite element method. The simulation results are compared with the experimental data.

The objective was biolubricant preparation from rubber seed oil (RSO) using polymerization reacto... more The objective was biolubricant preparation from rubber seed oil (RSO) using polymerization reactor with/without catalyst in batch reactor. Before become reactant in polymerization reaction, a non-edible rubber seed oil was converted into methyl ester by esterification/tranesterification reaction with methanol and acid/base catalyst. The polymerization reaction parameters investigated were reaction time, temperature and weight ratio (catalyst with feed), and their effect on the bio lubricant formation. The result show significant conversion of methyl ester to bio lubricant in the temperature reaction of 160 o C, reaction time of 2h min and ratio of super acid catalyst (tetrafluoroboric acid-sHBF4) of 3 %w/w. The resulting products were confirmed by GC-MS, FTIR spectroscopy and also analyzed for the viscosity. The best viscosity value of RSOFAME polymer was 110.6 cSt when the condition polymerization reaction were 160 o C, reaction time 3h, 6 wt% mass ratio of oil:catalyst.

Electrochimica Acta, 2010

LiNi1/3Co1/3Mn1/3O2 and LiCoO2 cathode materials were synthesized by using a supercritical water ... more LiNi1/3Co1/3Mn1/3O2 and LiCoO2 cathode materials were synthesized by using a supercritical water (SCW) method with a metal salt solution in a batch reactor. Stoichiometric LiNi1/3Co1/3Mn1/3O2 was successfully synthesized in a 10-min reaction without ...

Science & Technology Development Journal - Engineering and Technology

The outbreak and prolonged COVID-19 pandemic has caused a population decline as well as a profoun... more The outbreak and prolonged COVID-19 pandemic has caused a population decline as well as a profound impact on the global economy, the COVID virus spreads highly in the air through the process of sneezing, contact leads to many dangers to the health and safety of people around the world. Many simulation studies have been carried out to predict the risk of spread, as well as to find solutions to limit the infection when spreading sneeze droplets in the air. In this study, the motion and distribution of droplets containing coronaviruses emitted by coughing or sneezing in the isolation room at Ho Chi Minh City, Vietnam National University were investigated using ANSYS Fluent software. The airflow in the isolation room was simulated by a 3D turbulence model and energy equation using the finite volume method (FVM) with a domain of isolation room solved for appropriate boundary conditions. The effect of ventilation airflow speed and the size of droplets on the distribution of particles in t...

IOP Conference Series: Earth and Environmental Science

In the present study, we conduct the numerical simulation for a large-scale tunnel drying kiln in... more In the present study, we conduct the numerical simulation for a large-scale tunnel drying kiln in a brick factory performance by Ansys Fluent software. The airflow in the dryer was simulated by three-dimensional turbulence model with a domain of tunnel drying kiln is solved for appropriate boundary conditions. The velocity and temperature distribution of the dryer using the Realizable k–ε model. The CFD model is used to simulate the steady stage heat transfer and airflow within the dryer. In addition, the the meshing method for the dryer was investigated and show the influences on both air temperature distribution and air velocity distribution inside the dryer. From the simulation, the highest and the lowest temperature are 1025 K and 670 K respectively.

Chemical engineering transactions, 2021

A continuous process flowsheet for biodiesel production from crude castor oil and methanol was de... more A continuous process flowsheet for biodiesel production from crude castor oil and methanol was developed on Aspen HYSYS simulation environment. It consists of an acid-catalysed sub-process for pre-treatment of the crude feedstock and a base-catalysed one for trans-esterification of treated oil. Reactions involved were defined using kinetic parameters obtained from lab-scale experiments for increased realism, and reactor setup was decided based on basic technological and economical assessments. Specifications of other unit operations and flows were obtained from different approximation methods, literature adaptation and trade-off consideration. Input and output quality controls were achieved via simple adjustments with tight tolerances. The use of crude feedstock reduced the cost of raw material while expanding the scale of the process, which managed to produce 8000 tons of biodiesel having purity of over 99 % a year. Specifically, the process could remove up to 90.83 % amount of fre...

Chemical engineering transactions, 2021

Spraying herbicide, followed by burning, is a common practice for clearing pineapple residues (le... more Spraying herbicide, followed by burning, is a common practice for clearing pineapple residues (leaves and stems) and preparing subsequent cultivation crops in the Mekong Delta, Vietnam. This is an unsustainable agricultural practice that causes environmental pollution. In this study, pilot-scale pineapple residue composting was studied at Tan Phuoc district, Tien Giang province. Approximately 5.5 t of pineapple leaves and stems were mixed with 10 wt% food waste and 0.1 % v/w effective microorganisms. Chopped pineapple residues and food waste were distributed in layers in sequence and sprayed with the microorganism solution. Composting was carried out in a pyramid-shaped pile with a bottom diameter of approximately 5 m and a height of about 1.5 m. The composting temperatures were monitored daily using a digital thermometer. The composting mixture was withdrawn, mixed thoroughly and then re-distributed to the composting pile every 3 d. Composting was performed after 45 d when the comp...

Chemical engineering transactions, 2021

This study investigates internal conditions of the solar greenhouse dryer with drying agricultura... more This study investigates internal conditions of the solar greenhouse dryer with drying agricultural products. The operating conditions inside the solar greenhouse dryer were analysed by ANSYS Fluent software using mathematical models. Additionally, the moist air outside changed according to the climatic conditions of the day. Specifically, moist air enters the dryer through two front doors and exits through three exhaust fans installed in the back, and the flow was considered unstable and tumultuous. Agricultural products inside the solar greenhouse dryer were modelled as a porous material, and the radiation was modelled according to the radiation model. The simulation results show the distribution of temperature and humidity inside the solar drying greenhouse by the influence of heat exchange, turbulent flow, and the process of removing moisture from the drying material to the outside. The simulation results show that indoor drying temperature ranges from 303.15 K to 323.1 K at each...

MATERIALS TRANSACTIONS, 2020

Every year, trillions of cigarette butts (CB) are discarded all over the world without being recy... more Every year, trillions of cigarette butts (CB) are discarded all over the world without being recycled, thus causing negative impacts on the ecological environment as well as the health of living species. Cellulose acetate (CA), the main component of cigarette butts, is a valuable polymer for numerous applications. For the first time, by using a cost-effective freeze-drying method in the presence of polyvinyl alcohol (PVA) as a cross-linker, high-value engineering cellulose acetate aerogels were successfully fabricated from CB. The effects of component concentrations on the morphology of the CA aerogels were investigated by changing concentration of CA fibers (13.0 wt.%) and PVA (0.1 1.0 wt.%). The CA aerogels exhibited an extremely low density (25.445.6 mg/cm 3), a high porosity (96.4698.01%), and a low thermal conductivity (0.0340.039 W/(m + K)). The modified CA aerogels also expressed a great capacity of oil absorption (11.8225.22 g/g). Hence, the CA aerogel is a promising material for future uses in thermal insulation and oil spill treatment.

IOP Conference Series: Materials Science and Engineering, 2020

This work is to implement a working model of an integrated process for bioethanol in the process ... more This work is to implement a working model of an integrated process for bioethanol in the process simulation based on rigorous model using the Aspen HYSYS simulation software. As a case study, the simulation is applied to design a pilot plant that converts rice straw into ethanol. The model is based on the process for biochemical conversion of lignocellulosic biomass (rice straw) to ethanol, proposed by the pilot plant of producing bio-ethanol with capacity of 152 kg rice straw/batch. The plant for manufacturing bio-ethanol with rice straw as raw materials comprises basically three units: Pretreatment of rice straw by alkaline treatment; Simultaneous saccharification fermentation (SSF) of rice straw to produce bio-ethanol and the unit for separation and purification of bio-ethanol mixture from simultaneous and fermentation unit. Modeling of rice straw feedstock as a solid material in Aspen HYSYS, including the creation of necessary hypothetical components. Investigate and analyze the...

Science and Technology Development Journal, 2016

Finding alternative energy sources for fossil fuels was a global matter of concern, especially in... more Finding alternative energy sources for fossil fuels was a global matter of concern, especially in developing countries. Rice husk, an abundant biomass in Viet Nam, was used to partially replace fossil fuels by gasification process. The study was conducted on the pilot plant fixed bed up-draft gasifier with two kind of gasification agents, pure air and air-steam mixture. Mathematical modeling and computer simulations were also used to describe and optimize the gasification processes. Mathematical modeling was based on Computational Fluid Dynamics method and simulation was carried by using Ansys Fluent software. Changes in outlet composition of syngas components (CO, CO2, CH4, H2O, H2) and temperature of process, in relation with ratio of steam in gasification agents, were presented. Obtained results indicated concentration of CH4, H2 in outlet was increased significantly when using air-steam gasification agents than pure air. The discrepancies among the gasification agents were deter...

Science and Technology Development Journal, 2016

This paper reports the production of fatty acid methyl esters (FAMEs) and fatty acid ethyl esters... more This paper reports the production of fatty acid methyl esters (FAMEs) and fatty acid ethyl esters (FAEEs) by the transesterification reaction of rubber seed oil (RSO) in supercritical methanol and ethanol without using any catalyst. Experiment were carried out in a batch reactor, and reactions were studied at 260, 280, 300 and 320 oC at a pressure of 8.1-19 MPa with various mole ratios of ethanol – to - methanol from 0 to 100%. The extent of the reaction was explored using a convertibility parameter, which corresponds to the maximum ester content attainable from the feedstock. The highest FAME and FAEE contents achieved were 91.8 % and 86.4%, respectively. Results show that transesterification of RSO in methanol was more efficient than that in ethanol; the temperature had the strongest influence.

Science and Technology Development Journal, 2015

BHD (Bio hydrofined diesel) was synthesized from animal fat and vegetable oil by hydrodeoxygenati... more BHD (Bio hydrofined diesel) was synthesized from animal fat and vegetable oil by hydrodeoxygenation with CoMo/TiO2 catalyst. To improve the quality and the quantity of BHD, the synthesis co-doping of Ni, Cu on CoMo/TiO2 catalyst and catalytic performance were investiagated. The catalytic performance of various Ni, Cu- CoMo/TiO2 catalysts were studied for the hydrodeoxygention reaction at a range of temperature 300-350 oC. Compared with the hydrodeoxygention reaction with CoMo/TiO2 catalyst, the cetane number of BHD and the conversion reaction were higher when the co-doping catalyst was used. In addition, the quantity of BHD was increased 3-5 % vol when the hydrodeoxygenation reaction was done with co-doping Cu-CoMo/TiO2 catalyst.

Fuel, 2012

Hydrocracking of vacuum residue with activated carbon was conducted in a batch reactor with two t... more Hydrocracking of vacuum residue with activated carbon was conducted in a batch reactor with two types of supercritical hydrocarbon solvents, aromatic hydrocarbons (m-xylene and toluene) and normal alkane hydrocarbons (n-hexane and n-dodecane). The supercritical reactions were performed at 400°C with H 2 partial pressures of 3.45 MPa and 6.89 MPa. The supercritical hydrocarbon solvent affected the levels of conversion and coke formation as well as the distribution of oil products (naphtha, middle distillate, vacuum gas oil, and residue). The mass ratio of each oil product to the unreacted residue differed among the supercritical solvents. Compared to the product profile in n-alkane solvents, aromatic solvents yielded much smaller naphtha fractions and larger middle distillate fractions. An increase of surface acidity of the activated carbon led to the conversion improvement observed in the supercritical reactions. However, the increased partial pressure of hydrogen was not associated with significant changes in conversion. High conversion (69.2 wt.%) with low coke (13.5 wt.%), and high quality oil products (13.0 wt.% of naphtha, 34.9 wt.% of middle distillate, 27.1 wt.% of vacuum gas oil, and 11.2 wt.% of residue) could be obtained with supercritical m-xylene and acid-treated activated carbon.

IOP Conference Series: Earth and Environmental Science, 2021

This study shows the method for predicting the temperature distribution and air flow in the box o... more This study shows the method for predicting the temperature distribution and air flow in the box of a refrigerated container 40 feet, for two configurations (open and closed) of the rear door. Computational Fluid Dynamics – CFD (Computational Fluid Dynamics) is decoupled and used when the truck door is fully closed. The temperature, velocity vector and heat flow are simulated based on the finite element method. The simulation results are compared with the experimental data.

The objective was biolubricant preparation from rubber seed oil (RSO) using polymerization reacto... more The objective was biolubricant preparation from rubber seed oil (RSO) using polymerization reactor with/without catalyst in batch reactor. Before become reactant in polymerization reaction, a non-edible rubber seed oil was converted into methyl ester by esterification/tranesterification reaction with methanol and acid/base catalyst. The polymerization reaction parameters investigated were reaction time, temperature and weight ratio (catalyst with feed), and their effect on the bio lubricant formation. The result show significant conversion of methyl ester to bio lubricant in the temperature reaction of 160 o C, reaction time of 2h min and ratio of super acid catalyst (tetrafluoroboric acid-sHBF4) of 3 %w/w. The resulting products were confirmed by GC-MS, FTIR spectroscopy and also analyzed for the viscosity. The best viscosity value of RSOFAME polymer was 110.6 cSt when the condition polymerization reaction were 160 o C, reaction time 3h, 6 wt% mass ratio of oil:catalyst.

Electrochimica Acta, 2010

LiNi1/3Co1/3Mn1/3O2 and LiCoO2 cathode materials were synthesized by using a supercritical water ... more LiNi1/3Co1/3Mn1/3O2 and LiCoO2 cathode materials were synthesized by using a supercritical water (SCW) method with a metal salt solution in a batch reactor. Stoichiometric LiNi1/3Co1/3Mn1/3O2 was successfully synthesized in a 10-min reaction without ...