Consequence of nanoparticles size on heat transfer characteristics of a radiator (original) (raw)
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Chemical Engineering and Processing - Process Intensification, 2020
Innovative heat elimination technologies from the radiator are needed for weight reduction in an automotive vehicle to increase the overall performance. The fluids used nowadays are based on a combination of distilled water (DW) and ethylene glycol (EG), and also using nanofluids for improving heat transfer performance has been increased within the last couple of years. The use of aluminum oxide (Al 2 O 3) doped with unmilled silicon carbide (SiC UM) nanoparticles and milled Silicon carbide (SiC M) nanoparticles dispersed in DW and EG at 50:50 volumetric proportions experimented in this work. The focus for the important characterization of the nf which includes thermophysical properties is elaborated in this paper. The outcomes showed an optimum improvement regarding the overall thermal performance of 28.34 % making use of Al 2 O 3 doped with milled Silicon carbide (SiC M) at a volume concentration of 0.8 %. This might be due to the size reduction of SiC nanoparticles by the milling process involved in this experiment.
Study of Heat Transfer Characteristics of Nanofluids in an Automotive Radiator
IOP Conference Series: Materials Science and Engineering, 2018
This paper presents an experimental study on heat transfer using nanofluid as coolants in engines. Previous studies shows that Al2O3 is found to be more effective in heat transfer due to its high conductive property which is found to increase with concentration. Particles having diameter in the range 10-3 to 10-6 m have low thermal conductivities and cause clogging in the flow section along with significant friction and are highly unstable in solution. Nanoparticles on the other hand are easily dispersed and cause minimal clogging or friction in the flow. In the present work, ethylene glycol-water solution is taken as a base fluid for nanoparticle dispersion. The ratio of water to ethylene glycol used is 80:20 and it has been noted out that heat conduction improved with increasing fraction of ethylene glycol. The experiments were conducted with flow rate of 4,5,6 and 7 L/min and the air flow rate inside the duct was kept constant at 4.9 m/s. The temperature of water in the reservoir is kept at 70°C. The nanoparticles used in this experiment are Cu and TiO2 having particle size less than 80nm. Result shows that there is an improvement of 24.5% in the overall heat transfer coefficient and there was also an increase of 13.9% in the heat transfer rate compared to the base fluid (80:20 Water: EG solution).
Performance Investigation of Automobile Car Radiator using Nano fluid-A Review
Conventionally, water and ethylene glycol are used in car radiator for cooling the engine as a coolant. Performance of engine is measured by thermal conductivity. Water and ethylene has less thermal conductivity solution of this problem are solved by using nano fluid. It has been shown that nanofluid has property which increases heat transfer enhancement and high potential to increase the cooling. This paper focus on study the behaviour of the different type of nanofluid and investigate the thermal performance of car radiator experimentally and study effect of various factor i.e. flow rate, volume concentration and different temperature to enhance heat transfer of radiator.
Applied Thermal Engineering, 2010
Water and ethylene glycol as conventional coolants have been widely used in an automotive car radiator for many years. These heat transfer fluids offer low thermal conductivity. With the advancement of nanotechnology, the new generation of heat transfer fluids called, "nanofluids" have been developed and researchers found that these fluids offer higher thermal conductivity compared to that of conventional coolants. This study focused on the application of ethylene glycol based copper nanofluids in an automotive cooling system. Relevant input data, nanofluid properties and empirical correlations were obtained from literatures to investigate the heat transfer enhancement of an automotive car radiator operated with nanofluid-based coolants. It was observed that, overall heat transfer coefficient and heat transfer rate in engine cooling system increased with the usage of nanofluids (with ethylene glycol the basefluid) compared to ethylene glycol (i.e. basefluid) alone. It is observed that, about 3.8% of heat transfer enhancement could be achieved with the addition of 2% copper particles in a basefluid at the Reynolds number of 6000 and 5000 for air and coolant respectively. In addition, the reduction of air frontal area was estimated.
In the development of the many modern technology the primary challenge is thermal management. If we are looking towards the automobile sector the thermal management is the most difficult challenge. Nanofluids are suspension of metallic or nonmetallic nanoparticles in the base fluid; it can be used to increase the heat transfer rate of various applications such as internal cooling system of gas turbine blades, cooling system for automobile engine. This paper contains the literature survey which gives the techniques to implementation of the nanofluids in the car radiator for the cooling of engine.
2015
Mixture of water and ethylene glycol as conventional coolants has been widely used in an Automobile radiator for many years. These heat transfer fluids offer low thermal conductivity. With the advancement of nanotechnology, the new generation of heat transfer fluids called, "nanofluids" have been developed and researchers found that these fluids offer higher thermal conductivity compared to that of conventional coolants. Consistent technological development in automotive industries has increased the demand for high efficiency engines. A high efficiency engine is not only based on its performance but also for better fuel economy and less emission. Reducing a vehicle weight by optimizing design and size of a radiator is a necessity for making the world green. Addition of fins is one of the approaches to increase the cooling rate of the radiator. It provides greater heat transfer area and enhances the air convective heat transfer coefficient. However, traditional approach of ...
Performance Investigation of an Automotive Car Radiator Operated With Nanofluid as a Coolant
Journal of Thermal Science and Engineering Applications, 2013
Water and ethylene glycol as conventional coolants have been widely used in an automotive car radiator for many years. These heat transfer fluids offer low thermal conductivity. With the advancement of nanotechnology, the new generation of heat transfer fluids called, "nanofluids" have been developed and researchers found that these fluids offer higher thermal conductivity compared to that of conventional coolants. This study focused on the application of ethylene glycol based copper nanofluids in an automotive cooling system. Relevant input data, nanofluid properties and empirical correlations were obtained from literatures to investigate the heat transfer enhancement of an automotive car radiator operated with nanofluid-based coolants. It was observed that, overall heat transfer coefficient and heat transfer rate in engine cooling system increased with the usage of nanofluids (with ethylene glycol the basefluid) compared to ethylene glycol (i.e. basefluid) alone. It is observed that, about 3.8% of heat transfer enhancement could be achieved with the addition of 2% copper particles in a basefluid at the Reynolds number of 6000 and 5000 for air and coolant respectively. In addition, the reduction of air frontal area was estimated.
Analysis of Thermal Performance of a Car Radiator Employing Nanofluid
International Journal of Mechanical Engineering and Applications, 2014
In this study, thermal performance of a car radiator with employment of Ethylene Glycol/copper nanofluid in disparate environmental conditions has been investigated. The governing equations for heat transfer in the car radiator have been written and solved by using a generated computer code in different environmental states and the changes in the output nanofluid temperature have been studied. It has been shown that by increasing the values of volume fraction of nano-particles and also, Reynolds number of inlet air, one can observe a raise in the values of overall heat transfer coefficient of the air side and the rate of heat transfer. Furthermore, it is observed that by adding nano-sized particles to the coolant fluid in radiator, one can significantly reduce its output temperature. In addition, it has been demonstrated that by adding 5% of nano-particles to the coolant fluid, thermal performance of the radiator in a hot weather of 50˚ C can be better than its performance in the weather of 20˚C.
CFD Analysis of Heat Transfer Performance in a Car Radiator with Nanofluids as Coolants
Nanofluids are the new developed thermal fluids with enhanced thermophysical properties which can improve heat transfer performance of various applications. By introducing nanoparticles with high thermal conductivity in the car radiator coolant can enhance the effective thermal conductivity of coolant which improves the performance of cooling system. Alumina, silica and copper oxide nanoparticles with ethylene glycol-water mixture (60:40) have been used in 3-dimentional car radiator simulations to study fluid flow patterns and heat transfer performance. Heat transfer performance for ethylene glycol-water mixture based nanofluids at different nanoparticle concentrations has been studied. Heat transfer coefficients are determined by numerical simulations with varying coolant velocities. Overall heat transfer performance is found to be improved using nanofluids with high effective thermal conductivity. Results display significant increase in heat transfer performance of coolant in car radiator with an increase in the particle loading.
2021
The heat transfer system is of great importance in many commercial and domestic applications. Likewise, IC engine always maintained at the working temperature for good ex. The improper generation distribution of temperature affects the performance and reduces the efficiency of the engine hence to the vehicle/automobile. The performance of automobile Radiators can be substantially improved by a number of augmentation techniques. Heat transfer can be increased by active and passive flow control techniques or either with the incorporation of Nanofluids. As in order to remove the excess temperature, we need some cooling system in the automobile. The cooling system can be of two types Air and Water cooling system. Air cooling system is generally used in two-wheelers and airplanes. The air directly takes the heat from the surface of the engine through the fins available on them. In the water cooling system, a water jacket is provided around the engine which carries the heat of the engine and releases this heat to the atmosphere with the help of a component called a radiator. The radiator basically consists of the upper tank, lower tank, tubes, fins, thermostat, the inlet port and outlet port, pressure cap. In the present work, Simulation-Based Interpretation and Performance Analysis on Automobile Radiator through NanoParticle Fluids on modeled setup will be done trying to incorporate the condition of the automobile by using Nanoparticle fluids of Al2O3 and CuO. Water will also be taken to compare the performance of the Nanofluids. Results of numerous experimental and Ansys CFD solvers will be illustrated.