纳米通道内毛细流动下的沸腾传热机理研究  

Boiling Heat Transfer Mechanism Under Capillary Flow in Nanochannels

作　　者：孟胜男 龚晗 马晓腾 崔峥[1,2] MENG Shengnan;GONG Han;MA Xiaoteng;CUI Zheng(Institute of Advanced Technology,Shandong University,Jinan 250061,China;Shandong Institute of Advanced Technology,Jinan 250100,China;Institute of Thermal Science and Technology,Shandong University,Jinan 250061,China)

机构地区：[1]山东大学高等技术研究院,济南250061 [2]山东高等技术研究院,济南250100 [3]山东大学热科学与工程研究中心,济南250061

出　　处：《工程热物理学报》2025年第2期539-545,共7页Journal of Engineering Thermophysics

基　　金：山东省自然科学基金(No.ZR2021QE220);中国博士后科学基金(No.2021M702012);泰山学者项目(No.TSQN202103142)。

摘　　要：在高热流密度电子器件散热领域,被动式微通道散热技术具有高稳定性和低能耗的优势,其中相变过程带来了极高的传热效率。为了探究毛细微通道内的相变传热机理,本文利用分子动力学方法探究了液体在纳米通道内毛细流动下的气泡动力学行为及其影响因素。研究发现,较高的加热温度会加快气泡成核和生长。在相同的加热温度下,随着润湿性的增强,通道内液体从纯流动现象,到发生核态沸腾,乃至出现“烧干”现象。润湿性的增强有利于气泡的成核和生长,提高了传热性能,但其对液体流动造成了先促进后抑制的非线性影响。此外,发现气泡的产生会大幅增强传热效率。本研究对于完善纳米通道内毛细流动下的被动式相变传热机理具有重要意义。In the field of heat dissipation of electronic devices with high heat flux,passive microchannel heat dissipation technology has the advantages of high stability and low energy consumption,in which phase change process brings high heat transfer efficiency.To explore the mechanism of phase change heat transfer in capillary nanochannels,the bubble dynamic behavior and influence factors under capillary flow in nanochannels are studied using molecular dynamics method.It is found that higher heating temperatures will accelerate the nucleation and growth of bubbles.At the same heating temperature,with the enhancement of wettability,the liquid changes from pure flow phenomenon to nuclear boiling,and even“drying”phenomenon.The enhancement of wettability is beneficial to the nucleation and growth of bubbles,and improves the heat transfer performance.But it has a nonlinear effect on the liquid flow which first promotes and then inhibits.In addition,it is found that the generation of bubbles will greatly enhance the heat transfer efficiency.This study is of great significance for improving the passive phase change heat transfer mechanism under capillary flow in nanochannels.

关 键 词：气泡成核 毛细流动 润湿性 纳米通道 分子动力学 

分 类 号：TK124[动力工程及工程热物理—工程热物理]