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Heat Transfer Enhancement by Vortex Generators for Compact Heat Exchanger of Automobiles

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Document pages: 10 pages

Abstract: The paper describes the effects of heat transfer enhancement and gas-flowcharacteristics by wing-type-vortex-generators inside a rectangular gas-flowduct of a plate-fin structure exhaust gas recirculation (EGR) cooler used in acooled-EGR system. The analyses are conducted using computational fluiddynamics (CFD). The numerical modelling is designed as a gas-flow rectangularduct of an EGR cooler using two fluids with high temperature gas andcoolant water whose flow directions are opposite. The gas-flow duct used toseparate two fluids is assembled with a stainless steel material. The inlet temperatureand velocity of gas flowed inside gas-flow duct are 400°C and 30m s, respectively. Coolant water is flowed into two ducts on both a top and abottom surface of the gas-flow duct, and the inlet temperature and velocity is80°C and 0.6 m s, respectively. Wing-type-vortex-generators are designed toachieve good cooling performance and low pressure drop and positioned atthe center of the gas-flow duct with angle of inclination from 30 to 150 degreesat every 15 degrees. The temperature distributions and velocity vectorsgained from numerical results were compared, and discussed. As a result, it isfound that the vortices guided in the proximity of heat transfer surfaces playan important role in the heat transfer enhancement and low pressure drop.The collapse of the vortices is caused by complicated flow induced in thecorner constituted by two surfaces inside gas-flow duct.

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