Design and Analysis of Micro Heat Exchanger

Abstract

Advancement in electronics technology makes humans life better but also creates new challenges for controlling their performance. Nowadays, devices are getting smaller to provide human portability without compromising on performance. Thermal management of electronics is a major challenge as it strongly affects the performance of electronic devices. In this work, the nano fluid is a mixture particles and water, and its thermo physical properties are function of temperature and particle concentration. The particles which used are alumina and zirconia. To find optimum bend different bend angles from 20° to 90° are studied while considering pressure drop and Nusselt number. Different cross-section of channel between 25μm to 250μm range is simulated with 320K, 325K and 365K base temperature. Performance parameters including Nusselt number (Nu), pressure drop and base temperature is selected for single-channel configuration. Present results indicate that nano particle effects enhance the heat transfer performance and also increased pressure drop. To enhance heat transfer different particle concentration studied. TPF (thermal performance factor) is greater than 1 means more heat transfer and less pressure drop. Zircona-water is better performance than alumina-water. The present study calculated Nusselt number (Nu) and pressure drop for bend and straight channel. Furthermore, dean vortices effect on pressure drop and heat transfer is studied. Due to dean vortices heat transfer increases. Bend channel is better performance than single channel due to vortices.