微通道内气泡扰流强化换热研究

Study on Heat Transfer Enhancement of Bubble Disturbed Flow in Microchannel

摘要: 为有效解决电子器件微集成化带来的高热流散热问题，本文提出用气泡扰动流思想来强化换热。具体做法是在带周期性锯齿结构的微通道内，以水与空气泡两相流为流体介质，惯性受限流动过锯齿微结构表面，产生周期性气泡弹跳运动扰动近壁区热边界层，从而实现强化换热的目的。本文将系统研究锯齿结构倾角、发泡频率以及主流流速对气泡弹跳运动与换热的影响，以揭示锯齿微结构与气泡弹跳运动的耦合流动换热特性，为多相流流固耦合高效换热研究提供新视角。

Abstract: In order to effectively solve the problem of high-heat-flux heat transfer caused by the micro in-tegration of electronic devices, in this paper, we propose to strengthen the heat transfer by using the idea of bubble flow. Specific approach is to use water and air bubble as fluid medium in the microchannel with periodic saw tooth structure, inertial confined flow over the zigzag micro structure surface, resulting in periodic bubble bouncing motion disturbance near the wall thermal boundary layer, so as to achieve the purpose of strengthening heat transfer. In this paper, we will systematic study the dip angle of the zigzag structure, effects of foaming frequency and main flow velocity on the movement and heat transfer of air bubbles, and reveal the characteristics of coupled flow and heat transfer between zigzag micro structure and air bubble, providing a new perspective to study the multiphase fluid-solid coupling efficient heat transfer.