首页|叠层交错凹穴微通道热沉内流动与传热特性

叠层交错凹穴微通道热沉内流动与传热特性

扫码查看
原文链接
  • 国家科技期刊平台
  • NETL
  • NSTL
  • 万方数据
为改善日益呈现微型化和高功率化的微化工器件的散热性能,提出一种叠层交错凹穴微通道热沉.运用数值模拟方法研究该微通道热沉内流动和传热特性,考查扩缩比φ和高度比β对热性能的影响,并与直微通道热沉和单层三角形凹穴微通道热沉分别进行对比,评估其综合性能CPE.结果表明:具有叠层交错凹穴的微通道热沉的努塞尔数Nu和摩擦因数f分别比单层三角形凹穴微通道高10.1％—34.4％和5.9％—28.7％.Nu、f、CPE均随φ的增大而减小.当固定φ值且β=0.5时,Nu、f、CPE在相应雷诺数Re下达到最大值.在相同Re条件下,β在0.25-0.75内的变化不会引起流动阻力的显著波动.叠层交错凹穴微通道热沉可以加强流体的混合,中断热边界层的再发展,具有强化传热作用.
Flow and heat transfer properties in microchannel heat sink with laminated interlaced cavities
A MCHS-LIC(microchannel heat sink with laminated interlaced cavities)was proposed to improve the heat dissipation performance of microchemical engineering devices with increasing miniaturization and high power.The flow and heat transfer properties in the MCHS-LIC were studied by numerical simulation.The influences of expansion-to-contraction ratio φ and height ratio β on thermal performance were investigated.The MCHS-LIC was compared with the MCHS(microchannel heat sink)with straight channel and MCHS with single-layer triangular cavities,respectively.The evaluation was performed for the comprehensive performance CPE of the MCHS-LIC.The results show that the Nussel number Nu and friction factorf of the MCHS-LIC are 10.1％-34.4％and 5.9％-28.7％higher than those of the MCHS with single-layer triangular cavities.For the MCHS-LIC,Nu,f and CPE decrease with the increase of φ.When φ is fixed and β=0.5,Nu,f and CPE reach the maximum value at the corresponding Reynolds number Re.The change of β within the range of 0.25-0.75 doesn't cause significant fluctuations in flow resistance under the same Re.The MCHS-LIC can strength fluid mixing and interrupt the redevelopment of thermal boundary layer,thereby enhancing heat transfer.

laminated interlaced cavitiesmicrochannelheat sinknumerical simulationcomprehensive performanceenhancing heat transfer

柳林、张玲、张鑫宇、曹杨、曹子勇

展开 >

常州大学机械与轨道交通学院,江苏常州 213164

江苏省绿色过程装备重点实验室,江苏常州 213164

叠层交错凹穴 微通道 热沉 数值模拟 综合性能 强化传热

国家自然科学基金资助项目江苏省自然科学基金资助项目常州市科技计划资助项目常州大学学生课外创新创业基金资助项目常州大学机械与轨道交通学院SIETP基金项目

51606014BK20160281CJ20220124202310292149A2022-C-03

2024

10.3969/j.issn.1005-9954.2024.04.003

化学工程
华陆工程科技有限责任公司

化学工程

CSTPCD北大核心
影响因子：0.438
ISSN：1005-9954
年,卷(期)：2024.52(4)
  • 18