Ultra high performance heat sink using minute-tube-fin array of 100% fin efficiency

超高％20high％20性能％20heat％20sink％20using％20分钟管鳍％20array％20of％20100％％20fin％20效率

基本信息

批准号：
16360101
负责人：
MOCHIZUKI Sadanari
金额：
$ 8.45万
依托单位：
National University Corporation Tokyo University of Agriculture and Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2005
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-16360101/
关键词：
Heat transfer Boiling Heat transfer enhancement Phase change Heat pipe Flow visualization Multiphase flow

项目摘要

The increasing power consumption of the CPUs has made the thermal management one of the critical factors in their design. In order to deal with the high power density, the present investigators proposed a new type of heat transport device, called parallel tube heat transport device (PTH) consisting of several capillary tubes and headers on both ends. The objective of this study is to understand the physical phenomena occurring in the PTH and to show its feasibility.In the heat transport experiments, at first, two-dimensional test sections made of copper were used. The working fluid was R-134a, and the tube inner diameter and tube length were 0.51-2mm and 100mm, respectively. The followings were parameters : temperature difference between the headers, header inner diameter, and number of tubes (2-12). The peak effective thermal conductivity (k_<ef>) was larger for the smaller tube diameter, and the maximum value was 200times larger than that of copper. The PTH gave more than 10times larger k_<ef> than that of the meandering closed loop type. Next, the three-dimensional test section was manufactured using 0.51mm inner-diameter tubes, and its thermal resistance was reduced by 80% at most by the effect of the inside working fluid.In the flow visualization experiments, two-dimensional test sections made of glass were used. The working fluids were water and ethanol, and the tube inner diameter and tube number were 1.0-4.4mm and 1-6, respectively. When the tube number was 2-6, the upward and downward convections of both vapor and liquid were observed, which indicated that heat was transported by both sensible and latent heats.In the numerical analysis, one-dimensional compressible gas-liquid two phase flow analysis was performed. The CIP method was adopted, and the liquid plug motion due to the gas pressure difference was reproduced.

CPU 功耗的增加使得热管理成为其设计中的关键因素之一。为了应对高功率密度，本研究人员提出了一种新型热传输装置，称为平行管热传输装置（PTH），由多个毛细管和两端的集管组成。本研究的目的是了解 PTH 中发生的物理现象并展示其可行性。在热传输实验中，首先使用由铜制成的二维测试部分。工作液为R-134a，管内径为0.51～2mm，管长为100mm。以下是参数：集管之间的温差、集管内径和管数(2-12)。管径越小，有效导热系数峰值（k_<ef>）越大，最大值比铜大200倍。 PTH 的 k_<ef> 比蜿蜒闭环类型大 10 倍以上。接下来，采用0.51mm内径管制作三维测试段，在内部工作流体的作用下，其热阻最多降低80%。在流动可视化实验中，二维测试段制作使用了玻璃。工作流体为水和乙醇，管内径和管数分别为1.0-4.4mm和1-6。当管数为2-6时，观察到蒸气和液体均存在向上和向下对流，说明热量通过显热和潜热两种方式传递。数值分析中，一维可压缩气液两相流进行了分析。采用CIP方法，再现了由于气体压力差引起的液塞运动。