MINI HEAT EXCHANGER USING Al2O3-WATER BASED NANO FLUID (original) (raw)
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HEAT EXCHANGER USING NANO FLUID
This paper shows the research work on heat exchanger using nano fluid. In this paper we are using compact heat exchanger as heat transferring device while Al 2 O 3 as a nano fluid. The effect of the nano fluids on compact heat exchanger is analyzed by using ε –NTU rating numerical method on turbo-charged diesel engine of type TBD 232V-12 cross flow compact heat exchanger radiator with unmixed fluids consisting of 644 tubes made of brass and 346 continuous fins made of copper. Comparative study of Al 2 O 3 + water nano fluids as coolant is carried out.
Ultrahigh performance cooling is one of the important needs of many industries. However, low thermal conductivity is a primary limitation in developing energy-efficient heat transfer fluids that are required for cooling purposes. Nanofluids are engineered by suspending nano particles with average sizes below 100 nm in heat transfer fluids such as water, oil, diesel, ethylene glycol, etc. Innovative heat transfer fluids are produced by suspending metallic or non-metallic nanometer-sized solid particles. Experiments have shown that nanofluids have substantial higher thermal conductivities compared to the base fluids. These suspended nanoparticles can change the transport and thermal properties of the base fluid. The aim of this project is to summarize recent developments in research on nanofluids, and to carry out cfd analysis for four different nano fluids and the result is analysed, two fluids are selected for experimentation work and finally the experimented result is compared with...
2021
Cooling is almost important in industry. It is needed to improve the performance of cooling system. However due to the low thermal conductivity of fluid there will be limitations for the heat transfer characteristics. Nano fluid i.e suspension of nano size particles in the base fluid such as water ,ethylene glycol ,oil and diesel were used as innovative heat transfer fluid for cooling applications because thermal conductivity of the nano fluid is more than the conventional fluid such as water, ethylene glycol ,oil etc. There are many literature surveys available which shows that increase in the thermal conductivity and heat transfer characteristic with increased in concentration of nano particles in base fluid. The aim of this review is to summarize how increased concentration of nano particles increases the thermal conductivity and heat transfer rate. Also about the effect on the thermal and flow properties of nano fluid.
2015
Heat transfer in a Car radiator is carried out to cool circulating fluid which regulated of water and a mixture of water and coolant materials like Ethylene glycol (EG). In this Experimental study presented the mixture Ethylene glycol + water (50:50) combination with Al2O3 nanoparticle which is called nanofluids in used Car Radiator. In this Experimental Study Volume Concentration used 0.1%, 0.5%, 1% By mixing of Al2O3 nanoparticles (size 40 nm). Results of Thermal conductivity, over all heat transfer coefficient, Reynolds number, coolant pressure drop, pumping power have been represented in the present work. It is observed that Overall heat transfer coefficient & heat transfer rate increased different volume concentration by mixing Al2O3 particle and flow rate range 2-5 LPM respectively. Thermal conductivity of coolant basefluid (Ethylene Glycol) and nanofluid increases almost linearly with temperature (25 to 45oC).
International Journal of Engineering Research and Technology (IJERT)IJERT-, 2021
https://www.ijert.org/effect-of-concentration-of-al2o3-nano-particles-in-base-fluid-on-thermal-and-flow-properties-to-enhance-the-heat-transfer-rate https://www.ijert.org/research/effect-of-concentration-of-al2o3-nano-particles-in-base-fluid-on-thermal-and-flow-properties-to-enhance-the-heat-transfer-rate-IJERTV10IS020028.pdf Cooling is almost important in industry. It is needed to improve the performance of cooling system. However due to the low thermal conductivity of fluid there will be limitations for the heat transfer characteristics. Nano fluid i.e suspension of nano size particles in the base fluid such as water ,ethylene glycol ,oil and diesel were used as innovative heat transfer fluid for cooling applications because thermal conductivity of the nano fluid is more than the conventional fluid such as water, ethylene glycol ,oil etc. There are many literature surveys available which shows that increase in the thermal conductivity and heat transfer characteristic with increased in concentration of nano particles in base fluid. The aim of this review is to summarize how increased concentration of nano particles increases the thermal conductivity and heat transfer rate. Also about the effect on the thermal and flow properties of nano fluid.
Application of Nano-Fluids as Coolant in Heat Exchangers: A Review
Journal of Advanced Research in Materials Science, 2020
Nanofluids are important because they enhance heat transfer. Nanofluids are colloidal mixtures of nanometric metallic or ceramic particles in a base fluid, such as water, ethylene glycol or oil. Nanofluids possess immense potential to enhance the heat transfer character of the original fluid due to improved thermal transport properties. In this article, a brief overview has been presented to address the unique features of nanofluids, such as their preparation, heat transfer mechanisms, conduction and convection heat transfer enhancement, etc. About 55 published studies (1976-2015) are reviewed in this paper. It is marked from the literature survey articles that nano fluids performance are the most frequently studied as an efficient coolant for heat exchangers.
International Journal of Heat and Mass Transfer, 2018
In recent times conventional heat transfer fluids such as water and engine oil are widely used in the automobile radiator. However, to improve the thermal performance of the system, a lot more is required from the aspect of the heat transfer fluid. Major improvements in cooling capabilities have been constrained because of poor thermal conductivities of the working fluids, which is vital in the enhancement of heat transfer. The use of nano-sized (1-100 nm) solid particles as an additive suspended in the base fluid is one of the technique to enhancement heat transfer. This study aims to evaluate the performance of the heat transfer characteristics of water/anti-freezing based nanofluid as a coolant for car radiator. For the based fluid, a mixture of water and Ethylene Glycol were used with concentration of 50% for each of the fluid. Al 2 O 3 and CuO nano particles of concentration 0.05%, 0.15% and 0.3% were added to the base fluid and then evaluate the heat transfer characteristics of the nanofluid. The mass flow rate of nanofluid in the flat tube was kept constant. The heat transfer models are simulated using ANSYS fluent solver. The performance of the heat transfer characteristics were evaluated based on certain parameters which are the heat transfer coefficient, thermal conductivity, Nusselt number, and rate of heat transfer of the nanofluids. It was found that the nanofluid that exhibited the highest heat transfer performance was the CuO nanofluid. The heat transfer coefficient was recorded at 36384.41 W/m 2 K, the thermal conductivity was 1.241 W/m K, Nusselt number was 208.71 and the rate of heat transfer was at 28.45 W. The Al 2 O 3 nanofluid had a heat transfer coefficient of 31005.9 W/m 2 K, thermal conductivity of 1.287 W/m K, Nusselt number was 173.19 and the rate of heat transfer was at 28.25 W.
INVESTIGATION OF THERMAL PERFORMANCE OF AIR TO WATER HEAT EXCHANGER USING NANO-FLUIDS
Iium Engineering Journal, 2011
In the present study the three-dimensional numerical simulation is selected as a tool to investigate the effectiveness of a cross flow heat exchanger. Water is selected to be mixed with nano-particles and flow inside a circular pipe while a pure air is flowing across it. Numerical simulations is carried out under laminar flow for both water and air sides. The thickness of the pipe is neglected in the present preliminary study. From the physics of the problem, the governing parameters can be determined as: the Reynolds, the type and the volume fraction of the nono-fluid. The effect of these governing parameters is studied and the results are presented. The results show significant enhancement of heat transfer with introduction of nano-particles, such as titanium-oxide (TiO2) nano-powder, compared to the pure base fluid. The accuracy of the results presented in the present study depends on the accuracy of the effective properties of the nano-fluids, which are taken from the open literature.
Heat transfer analysis of heat exchanger using Al2O3 nanofluid
Journal of Thermal and Fluid Science, 2020
This project describes the experimental analysis of aluminum based nano fluid with the help of heat exchanger system. A pipe in pipe heat exchanger is used. The heat exchanger is designed in such that the cross flows between fluids. The nano fluid is supplied from one end from pump and from another side water is supplied in crossflow direction. The purpose of a system is to investigate the rate of heat transfer nano fluid and to increase rate of heat transfer of the system using nano fluid. This dissertation is an experimental study to reduce the loss of heat and increase the rate of heat transfer and effectiveness of system.
A experimental and numerical study has been carried out on the enhancement of the heat exchanged on a tube and fin heat exchanger cooled by an air flow containing water droplets by using nozzle system. A numerical model representing the heat transfer has been presented and validated using the experimental data. The cooling of air due to water evaporation upstream in a channel to the exchanger (condenser fed with hot water with different temperature) and the supplementary evaporation of droplets while impacting or crossing the exchanger leads to enhance heat exchange. As additional to enhance heat exchange, adding a nanoparticle (Al2O3) to the water of the heat exchanger and studying the effect of the nanofluid with two volume concentrations (0.5 & 2 %). All the tests were carried out with working fluid flow rate (4, 6 and 8 L/min) and with temperature (40, 45 and 50 oC).The results obtained maximum Nusselt number ratio ( / , ) was (1.235) which occurred at nanofluid concentration 2% with using sprayed air. The heat transfer coefficient ratio ( / , ) increases when using nanofluid and by increasing the volume concentration and the maximum enhancement ratio was (1.45) which occurred at nanofluid concentration 2% and with using sprayed air to cool the heat exchanger. The average Nusselt number with Reynolds number correlated for working fluid. The numerical