工程科学与技术2018，Vol.50Issue(1)：101-106,6.DOI:10.15961/j.jsuese.201700295
自相似结构微通道传热分析及结构优化
Analysis of Heat Transfer Performance of a Self-similarity Microchannel Heat Sink and Structure Optimization
摘要
Abstract
With the increase in heat release rate of electronic devices such as large scale integrated chips,etc.,it has been very difficult for conven-tional microchannel heat sink (MHS) to meet the demand of heat dissipation of these devices.As a new design of heat sink,Self-Similarity mi-crochannel Heat Sink (SSHS) has a better comprehensive performance and wider application prospect compared with a conventional MHS.In spite of this,it still has deficiencies of flow maldistribution and nonuniform heat transfer to a certain extent.In order to overcome the defect of its own and improve its performance,the manifold channel of the original SSHS is modified to a contracting one.At the same time,an optimization work was carried out with numerical method on the basis of the analysis of the influence of the structural parameters.In view of the same substruc-ture of a SSHS,a single unit consisting of ten overflow channel,half of a manifold channel and outflow channel was chosen to be analyzed and op-timized.Water was selected as working fluid with the mass flow rate covering the range of 0.27~0.90 kg/h.A uniform heat flux of 1 MW/m2was imposed on the cover plate under the atmospheric pressure.The flow is assumed to be laminar due to Re in the range from 150 to 500.The numer-ical analysis results showed that there existed a strong flow stagnation in the end of the manifold channel,leading to flow maldistribution among the overflow channels.The difference in flow rates is up to 9.5~12.9 times with each other,and this directly results in uneven heat transfer process.The temperature difference across the outer surface of the cover plate reaches 10.8~12.1 ℃.Modifying the manifold channel to a contract-ing tapered one eliminated the stagnation effect to a certain extent.The optimization and comparison analysis showed that the uniformity in flow distribution and heat transfer could be further improved with increasing the slope angle,but with the cost of increasing the flow resistance to a cer-tain extent.The best comprehensive performance can be obtained with the slope angle specified as 4.3° for current situation.Although the maxim-um pressure drop is increased by about 12%,the maximum relative difference in flow rates is reduced to 2.7 from 12.9,and the increase in heat transfer uniformity exceeds 50%.The improved and optimized design of SSHS offers a reference to the application of SSHS.关键词
微通道/热沉/散热/电子设备/自相似结构/优化Key words
micro channel/heat sink/heat dissipation/electrical device/self-similarity structure/optimization分类
通用工业技术引用本文复制引用
王喆,孙立成,刘洪涛,谢果,唐继国,鲍静静..自相似结构微通道传热分析及结构优化[J].工程科学与技术,2018,50(1):101-106,6.基金项目
国家自然科学基金资助项目(51376052 （）
51606130 （）
51506099) （）
