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Moulding and fluid flow analysis of wavy fin based automotive radiator
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Moulding and fluid flow analysis of wavy fin based automotive radiator

Category : Automobile


Sub Category : Vehicle


Project Code : ITMA12


Project Abstract

In continuous technological development, an automotive industry has increased the demand for high efficiency engines. A high efficiency engines in not only based on its performance but also for better fuel economy and less emission rate. Radiator is one of the important parts of the internal combustion engine cooling system. The manufacturing cost of the radiator is 20 percent of the whole cost of the engine. So improving the performance and reducing cost of radiators are necessary research. For higher cooling capacity of radiator, addition of fins is one of the approaches to increase the cooling rate of the radiator. In addition, heat transfer fluids at air and fluid side such as water and ethylene glycol exhibit very low thermal conductivity. As a result there is a need for new and innovative heat transfer fluids, known as “Nanofluid” for improving heat transfer rate in an automotive radiator. Recently there have been considerable research findings highlighting superior heat transfer performances of nanofluids about 15-25% of heat transfer enhancement can be achieved by using types of nanofluids. With these specific characteristics, the size and weight of an automotive car radiator can be reduced without affecting its heat transfer performance.

          An automotive radiator (Wavy fin type) model is modelled on modelling software CATIA V5 and performance evaluation is done on pre-processing software ANSYS 14.0. The temperature and velocity distribution of coolant and air are analyzed. Results have shown that the rate of heat transfer is better when nanofluid (Si C + water) is used as coolant, than the conventional coolant.

SIMULATION PROCESS

                  For implementing the analysis, pre-processing software ANSYS 14.0 is used for the compact heat exchanger. This software is useful in analyzing the fluid properties at operating temperatures is estimating the velocity and temperature distribution of coolant and air of cross flow automotive radiator. Numerical simulation approach is adopted using the theory of three-dimensional computational fluid dynamics and flow direction is studied with the help of CFX. With this approach, it was able to generate three dimensional patterns for temperature and pressure of coolant and air, inside and outside the radiator respectively. As the model analysis is difficult with available resources, 625 tubes model is reduced to 16 tubes model which gives the same result, in the specific ratio. The radiator model is imported from CATIA to ANSYS through a neutral file format STEP. Imported model contains only single volume of radiator with fins. For the analysis of the radiator model, we need volume of coolant and air flow. Coolant volume is created by selecting all the inner surfaces of the radiator where the coolant flows. Continuum type of air and coolant are set to fluid and radiator is set to solid. Inlet and outlet areas of coolant (inside the radiator) and air (outside the radiator) have been assigned which are further used in CFX.


 
 
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