Chukwuma Kadurumba | Michael Okpara University of Agriculture, Umudike, Abia State, Nigeria (original) (raw)

Papers by Chukwuma Kadurumba

Green Technologies and Sustainability

FUOYE Journal of Engineering and Technology

The study focuses on the design and performance evaluation of a cassava peeling machine, with the... more The study focuses on the design and performance evaluation of a cassava peeling machine, with the primary objective of mitigating labor-intensive tasks and enhancing the efficiency of processing cassava into different food products. The machine consist of a peeling chamber using a perforated stainless-steel plate as an abrasive surface, an integrated water system, a structured support frame, and a 1hp electric motor as its power source. Evaluation was based on the effect of peeling drum utilization, encompassing different cassava root mass variations (5, 10, 15, and 20kg) and residence time on key performance indicators (proportion by weight, peeling efficiency and throughput capacity). The machine exhibited commendable performance and was operated at a reduced speed achieved through a reduction gear mechanism, resulting in an average peeling efficiency of 87%. The machine's average throughput capacity stood at 105.10 kg/hr, and the average proportion by weight was 0.86 kg acro...

This design work presents an improved centrifuge for dewatering cassava mash that extracts efflue... more This design work presents an improved centrifuge for dewatering cassava mash that extracts effluent from the mash for any genotype of cassava. The methods adopted in the execution of this project work include; Machine design, Machine development, Machine evaluation and Optimization to compare the present machine to that of the previous designs. Machine efficiency, safety factors, and portability were considered in this research. The receiver hopper was carefully designed at the angle 23° that the mash can flow smoothly while filter basket, shaft, collector and conveyor auger were designed using stainless steel. Also, the frame of the machine is made up of angle iron at the four corners for support and holding the top bearings are mild steel metals to keep it in place and withstand vibration. Pulleys used in the design were made of cast iron. The screw conveyor and the basket end plate designed using mild steel to serve a dual purpose; cover for the filter basket and shaft for the basket bearing while blower was also introduced for drying of mash faster and yarn used for preventing leakages. The machine runs on a single phase five horsepower electric motor at a speed of 1440 rpm. The capacity of the dewatering fabricated was 158 kg/hr and 30% reduction in size and 50 % reduction in price was achieved.

Nigeria Agricultural Journal, Aug 31, 2021

The development of cassava reciprocating slicing machine was achieved using locally sourced mater... more The development of cassava reciprocating slicing machine was achieved using locally sourced materials that is affordable and effective. Although hand slicing is the cheapest form of slicing operation, but it has posed to be labour intensive, time-wasting, and hazardous. This necessitated the design and development of a cassava slicing machine. The machine's capacity for boiled and unboiled cassava root was calculated as 22.8kg/hr, with an average slicing time of 0.005hr for boiled and 0.00455hr for unboiled cassava root. The machine has low labour requirements and power consumption. The cassava reciprocating slicing machine use electric motor of 0.75kw (1hp) rating, with a speed of 99rpm. The machine is made with stainless steel for the slicing section and other components with mild steel and has an overall efficiency of 91.05%. The machine reduces drudgery and also enhances mass production of cassava chips, implying more profit.

Nigeria Agricultural Journal, Aug 31, 2021

The study was the design and development of a cassava peeling machine to reduce drudgery and impr... more The study was the design and development of a cassava peeling machine to reduce drudgery and improve the productivity of cassava processing into various foods. The cassava peeling machine consists of the peeling drum (with both knife and abrasive embedded), conveyor, electric motor, and speed reducer. The machine was designed using solid work software. The peeler was evaluated with cassava root length of about 300mm. The speed range of 90-120rpm was used to test the performance of the peeler. The average capacity of the developed machine was 450kg/h, with a peeling efficiency of 90%. The root loss of 5% and peel retention of 5% were obtained during machine test. The various shapes of cassava roots do not affect the machine's functionality as it functions well on the different shapes and sizes of cassava roots. Results also show that the machine is affordable and efficient and is recommended to improve the processing productivity of cassava food products. It is therefore, recommended that further research be carried out on cassava roots geometry and thickness to further improve the peeling efficiency of the machine. Modelling of the cassava peeling process should be studied, taking into consideration the physical parameters; towards identifying any flaw that needs improvement in the present design. More research should be carried on the utilization of alternative sources of energy like solar to power the machine at a minimal energy cost.

Nigeria Agricultural Journal, Dec 31, 2020

Arid Zone Journal of Engineering, Technology and Environment, 2018

The optimal settings of the dependent and independent variables for the Mucuna flagellipsis nuts ... more The optimal settings of the dependent and independent variables for the Mucuna flagellipsis nuts processing as condiments were determined using response surface experimental methodology (RSM). The independent variables are time and temperature while the dependent variables were based on the responses investigated in the study. The design settings of the process are boiling time (30 mins to 105mins) and temperature (80oC to 105oC). Central composite circumscribed RSM coded experimental plan was used. The result of the study showed that Mucuna flagellipes must be boiled for 58.03 minutes to obtain the best proximate and anti-nutrients responses. Also, the optimal values of the responses obtained are 0,4664, 0.2528, 0.1648, 1.7072, 854.135, 61.7713, 11.4038, 5.78661, 2.6652, 3.6692, 85.1573, 14.8445 for Alkaloid, Tannin, Saponin, L-Dopa, Hemagglutinins content, Carbohydrate, Crude protein, Ether Extract, Crude Fibre, Ash content, Dry matter content, and Moisture content respectively.

International Journal of Phytoremediation, 2016

The present study was carried out to explore the potential of the isolated bacterial strains isol... more The present study was carried out to explore the potential of the isolated bacterial strains isolated from Gabal El Sela in Eastern Dessert, Egypt for biosynthesis of uraninite nanoparticles intracellularly. The most potent bacterial strains associated (intra) with uranium nanoparticles were characterized by transmission electron microscope (TEM), Fourier transform infrared (FTIR) and Energy Dispersive X-ray (EDX). Studying factors affecting biosynthesis of uranium nanoparticles indicated that the optimum conditions were 6000 ppm uranium concentrations at pH 7.0 and temperature 30 C ± 1 after five days with 10% biomass under shaking conditions and the maximum uranium uptake by MAM-U9 cells was 3300 ppm (55%) from uranyl nitrate solution and 3600 ppm (72%) from Sela rock sample. Results of TEM micrograph show those uranium nanoparticles (UNPs) with size ranging from 2.9 to 21.13 nm inside cells. The kinetics, isotherm and thermodynamics parameters of uranium uptaken by bacterial strain MAM-U9 have been determined and found to be a first order process (R 2 ¼ 9935), follows Langmuir isotherm (R L 2 ¼ 0.998) and the thermodynamics of DG ¼-9.715 kJmol À1 , DH ¼ 16.987 kJmol À1 and DS ¼ 0.0881 kJmol À1 K À1 at 30 C.

Nigerian Journal of Technology, 2014

This paper presents This paper presents This paper presents This paper presents the volumetric th... more This paper presents This paper presents This paper presents This paper presents the volumetric the volumetric the volumetric the volumetric performance performance performance performance influence of influence of influence of influence of vor vor vor vortex motion. Vortex motion is tex motion. Vortex motion is tex motion. Vortex motion is tex motion. Vortex motion is and surface of the helical blade, and surface of the helical blade, and surface of the helical blade, and surface of the helical blade, and the variable helix angle of the helical flight from t and the variable helix angle of the helical flight from t and the variable helix angle of the helical flight from t and the variable helix angle of the helical flight from t blade t blade t blade t blade to the shaft. The vortex motion and o the shaft. The vortex motion and o the shaft. The vortex motion and o the shaft. The vortex motion and throughput. An analysis of the vortex motion throughput. An analysis of the vortex motion throughput. An analysis of the vortex motion throughput. An analysis of the vortex motion Machi Machi Machi Machine ne ne ne is presented. It is shown is presented. It is shown is presented. It is shown is presented. It is shown that that that that absolute gr absolute gr absolute gr absolute grain velocity being ain velocity being ain velocity being ain velocity being constant with the radial position of a point on the blade. On this basis, an constant with the radial position of a point on the blade. On this basis, an constant with the radial position of a point on the blade. On this basis, an constant with the radial position of a point on the blade. On this basis, an for the volumetric efficiency is d for the volumetric efficiency is d for the volumetric efficiency is d for the volumetric efficiency is derived. The volumetric throughput can then be predicted. erived. The volumetric throughput can then be predicted. erived. The volumetric throughput can then be predicted. erived. The volumetric throughput can then be predicted. the results of an experimental screw conveyor where the analytical predictions correlate closely to the measured the results of an experimental screw conveyor where the analytical predictions correlate closely to the measured the results of an experimental screw conveyor where the analytical predictions correlate closely to the measured the results of an experimental screw conveyor where the analytical predictions correlate closely to the measured results. results. results. results.

Nigerian Journal of Technology, 2014

Cassava Cassava Cassava Cassava p p p pelleting in most developing countries are usually done man... more Cassava Cassava Cassava Cassava p p p pelleting in most developing countries are usually done manually. This process is very laborious, time elleting in most developing countries are usually done manually. This process is very laborious, time elleting in most developing countries are usually done manually. This process is very laborious, time elleting in most developing countries are usually done manually. This process is very laborious, time consuming and unhygienic. A consuming and unhygienic. A consuming and unhygienic. A consuming and unhygienic. A p p p pelleting machine has been recommended because of its low cost, high capacity of elleting machine has been recommended because of its low cost, high capacity of elleting machine has been recommended because of its low cost, high capacity of elleting machine has been recommended because of its low cost, high capacity of providing pelleted cassava as well as relative ease of operation and maintenance. The machine consists of a screw providing pelleted cassava as well as relative ease of operation and maintenance. The machine consists of a screw providing pelleted cassava as well as relative ease of operation and maintenance. The machine consists of a screw providing pelleted cassava as well as relative ease of operation and maintenance. The machine consists of a screw conveyor for conveying the cassava mash through the dies openings, electric motor, pulley drives and belts. A conveyor for conveying the cassava mash through the dies openings, electric motor, pulley drives and belts. A conveyor for conveying the cassava mash through the dies openings, electric motor, pulley drives and belts. A conveyor for conveying the cassava mash through the dies openings, electric motor, pulley drives and belts. A performance optimization of the performance optimization of the performance optimization of the performance optimization of the system was carried out to maximize the solid product recovery, efficiency and system was carried out to maximize the solid product recovery, efficiency and system was carried out to maximize the solid product recovery, efficiency and system was carried out to maximize the solid product recovery, efficiency and throughput of the machine. The optimization results shows that the responses efficiency, throughput and power throughput of the machine. The optimization results shows that the responses efficiency, throughput and power throughput of the machine. The optimization results shows that the responses efficiency, throughput and power throughput of the machine. The optimization results shows that the responses efficiency, throughput and power consumption of the machine were determined as 58%, 75.76kg/hr and 41 consumption of the machine were determined as 58%, 75.76kg/hr and 41 consumption of the machine were determined as 58%, 75.76kg/hr and 41 consumption of the machine were determined as 58%, 75.76kg/hr and 41 models were developed using dimensional analysis. The independent variables such as screw pitch, conveyor speed models were developed using dimensional analysis. The independent variables such as screw pitch, conveyor speed models were developed using dimensional analysis. The independent variables such as screw pitch, conveyor speed models were developed using dimensional analysis. The independent variables such as screw pitch, conveyor speed and bulk density were used to derive the dimensionless parameters used as input variables for the regression and bulk density were used to derive the dimensionless parameters used as input variables for the regression and bulk density were used to derive the dimensionless parameters used as input variables for the regression and bulk density were used to derive the dimensionless parameters used as input variables for the regression a a a analysis. The dependent variables like the mass number, power number and the processing time number were nalysis. The dependent variables like the mass number, power number and the processing time number were nalysis. The dependent variables like the mass number, power number and the processing time number were nalysis. The dependent variables like the mass number, power number and the processing time number were measured and compared to computed values such as their standard errors, percentage errors and coefficient of measured and compared to computed values such as their standard errors, percentage errors and coefficient of measured and compared to computed values such as their standard errors, percentage errors and coefficient of measured and compared to computed values such as their standard errors, percentage errors and coefficient of determination. determination. determination. determination.

Nigeria Agricultural Journal, 2010

Journal of Agriculture and Social Research, 2016

This study presents the Estimates of Factors Influencing Decision to Participate in Cocoyam Marke... more This study presents the Estimates of Factors Influencing Decision to Participate in Cocoyam Marketing in Abia State, Nigeria. The specific objectives of this study are to estimate factors influencing the decision to participate in cocoyam marketing in Abia State. Primary and secondary data were used in the survey. The primary data were collected from a random sample of 200 cocoyam marketers in Abia State. The respondents were drawn from rural and urban markets in the agricultural zones of the state. The data were analyzed using probit model. The result shows that values of cocoyam and farm size are positively associated with the probability to sell cocoyam. This probably means that households with large farm sizes tended to produce marketable surpluses and participated in the market as sellers. Moreover, it is possible when the value of the crop was high(1.0%,significant). The coefficients on education and price of cocoyam have positive signs. The result shows that education acquire...

Nigeria Agricultural Journal, Dec 31, 2020

The innovative fish feed pelleting machine used for the analysis consists of three distinct units... more The innovative fish feed pelleting machine used for the analysis consists of three distinct units; grinding, pelleting and drying. Three feed samples of the fish feed materials-X1, X2 and X3 weighing 250g each were o prepared at different moisture contents of 7, 11, 13 and 15%. The samples were dried at a temperature of 102 C for 24hrs and weighed after cooling. Also, the samples were subjected under three machine speeds: 75, 95, 138 and 200 rpm and die diameter of 3, 4, 5 and 6 mm. The results showed that pelleting efficiencies of 94.0%, 93.2%, and 92.1% for the feed samples X1, X2 and X3 respectively were obtained at moisture contents of 7%, die hole of 3mm and speed of 75rpm. The result also revealed that the feed mixtures of X1, X2 and X3 processed at die hole diameter of 4mm, die speed of 95rpm and moisture content of 11% gave the lowest values of throughput of 36, 38, and 34 kg/h respectively for the machine. The feed mixture (X1) at die hole diameter of 4mm, die speed of 95rpm and moisture content of 11% gave the highest value of pelleting durability of 85.7% among the feed mixtures evaluated. Therefore, the performance of the innovative fish feed pelleting machine show that the machine would help in selecting the best machine variables for different feed mixtures

Poljoprivredna tehnika, 2022

Manual ginger juice expression processes are tedious, unhygienic, and inefficient, affecting the ... more Manual ginger juice expression processes are tedious, unhygienic, and inefficient, affecting the quality and quantity of ginger juice extracted. Extraction by chemical means is complex, expensive, and requires high skill to operate. The developed motorized ginger juice expression machine performs two distinct unit operations: size reduction and separation processes. Major components of the machine include the feeding unit, pulverizing unit, juice expression unit, juice drainage point, waste outlet, frame, and power transmission system. The machine is powered by 2 H.P., 1400 rpm and 1 H.P., 1430 rpm prime movers, and the V-belts and pulley assembly speed are 646 rpm and 240 rpm, respectively. The developed expression machine offers an affordable and simple method of processing fresh ginger minimizing loss in ginger rhizome quantity and quality, and ultimately reducing postharvest losses.

Nigerian Journal of Technological Research, May 3, 2018

An off wing fleet maintenance study of the CFM56-3B Turbofan engine that propels the Boeing 737-3... more An off wing fleet maintenance study of the CFM56-3B Turbofan engine that propels the Boeing 737-300 aircraft is presented. The engine performance and deteriorating behavior was modeled with a view to estimate the creep life consumption and operating severity. The predicted severity factor of each degradation was similar to the trend observed by the maintenance, repair and overhauling (MRO) with 0-3.1% difference. The combine degradation severity factor of the engine operating at both saline and desert mission areas was 6.4% and 7.5% respectively when compared with compressor fouling or turbine erosion cases. The creep life obtained was 2.5% lower. Combine degradation resulted in high severity factor of 5% emission development index (EDI) and the cost of complete replacement of a damaged blade was USD 256 per flight hour (FH). However, for the isolated cases of degradation, the severity factor was 3% EDI lower and the cost of refurbishing a damage blade was USD 81/FH. This indicates that a refurbishment program can be considered for CFM56-3B engines operating in condition of low severity and replacement program for engines operating in condition of high severity.

Sustainable Energy Technologies and Assessments, 2018

The optimum exergetic performance parameters and thermo-sustainability indicators (TSIs) of low-t... more The optimum exergetic performance parameters and thermo-sustainability indicators (TSIs) of low-temperature Organic Rankine cycles (ORCs) are presented. The study objectives are (i) to determine the exergetic performance, and TSIs of modified ORCs based on different thermodynamic inputs and (ii) compare the optimum exergetic performance parameters and the TSIs of the ORCs. The TSIs considered include, waste exergy ratio (WER), exergy efficiency (EE), exergetic sustainability index (ESI) and environmental effect factor (EEF). Additionally, a component by component exergy analysis was first performed, followed by the application of the TSI models established by modifying the existing TSI model for open cycle thermal plants. The results indicated that the increase in EE across the ORCs was not greater than 0.3%. The exergy destruction gap across the ORCs was between 1.2 and 23%. The ESI was low with the basic ORC while the modified systems had improved ESIs. However, best exergetic performance and TSIs were obtained at optimum conditions of ≤ ≤ 0.127 p 2.144 MPa 1 , ≤ ≤ 0.17 p 2.5 MPa 2 and ≤ ≤ 416 t 426 3. The study inferred that system configuration and type of working fluids are paramount in determining the ORC performance. Moreover, the results obtained can further be used to evaluate the functional sustainability limits of working fluids.

This paper indicates that the city in our country is faced with some problems now, especially in ... more This paper indicates that the city in our country is faced with some problems now, especially in the lacking of humane care. It analyzes the human life world, and then stresses that it is very important for urban design to regress to the life world. It points out that urban design essentially pur- sues humane care. It endows urban environ- ment with the attribute of human through building place. As a result, it makes the city become the human life world, and give people the feeling of their existent value and meaning.

Journal of the Chinese Advanced Materials Society, 2018

The effects of process parameters (temperature, time and particle size) on the oil yield as well ... more The effects of process parameters (temperature, time and particle size) on the oil yield as well as their effects on the kinetic and thermodynamic (enthalpy, entropy and free energy) parameters of ...

Green Technologies and Sustainability

FUOYE Journal of Engineering and Technology

Nigeria Agricultural Journal, Aug 31, 2021

Nigeria Agricultural Journal, Dec 31, 2020

Arid Zone Journal of Engineering, Technology and Environment, 2018

International Journal of Phytoremediation, 2016

Nigerian Journal of Technology, 2014

Nigeria Agricultural Journal, 2010

Journal of Agriculture and Social Research, 2016

Nigeria Agricultural Journal, Dec 31, 2020

Poljoprivredna tehnika, 2022

Nigerian Journal of Technological Research, May 3, 2018

Sustainable Energy Technologies and Assessments, 2018

Journal of the Chinese Advanced Materials Society, 2018