Heat Transport Characteristics and its Mechanism of Heat Transport Device Using Parallel Tubes

平行管传热装置的传热特性及其机理

基本信息

批准号：
18360099
负责人：
MOCHIZUKI Sadanari
金额：
$ 8.99万
依托单位：
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：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18360099/
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. The present investigators proposed a new type of heat transport device, called parallel tube heat transport device (PTH) consisting of multiple capillary tubes and headers on both ends. PTH has a heat transport potential higher than any other heat transport devices previously proposed. The objective of this study is to examine the fundamental heat transport characteristics of PTH and to clarify its heat transport mechanism.In the heat transport experiments, two types of test sections were used. First test section had six copper tubes. The working fluid was R-134a, and the tube inner diameter and tube length were 2mm and 100mm, respectively. In this case, the heat was supplied by circulating the hot water around an evaporator. Second test section had two (inner diameter of 6.5mm and 3.5mm) or six (inner diameter of 2.8mm) copper tubes and used water as a working flui … More d. In this second case, the electric heater was used to heat the evaporator, and the effects of inclination angle, heating rate, and tube length were examined.In the flow visualization experiments, in order for the test section to be endurable against the high pressure caused by a working fluid of R-134a, the test section was made out of a brass plate by machining channels (2mm x 2mm x100mm) and covering it with a transparent plastic plate. The number of channels was three or six. In the case of six-channel test section, the effect of the combination of different channel sizes was also examined by replacing two channels out of six with those having larger side length of 4mm. Three-channel test section showed the unidirectional circulating flow or the oscillating flow depending on the temperature difference between two headers. In the results of the six-channel test section, the transported heat increased by combining two channel sizes. The image processing system developed in this study can capture the upward and downward flow velocities, its temporal change, and the flow pattern in the multiple channels. Less

CPU 功耗的增加使得热管理成为其设计中的关键因素之一，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)，由多个毛细管和集管组成。 PTH 的热传输潜力高于之前提出的任何其他热传输装置。本研究的目的是研究 PTH 的基本热传输特性并阐明其热传输机制。在热传输实验中，有两种类型。使用了测试部分。有六根铜管，工作流体为R-134a，管内径和管长分别为2mm和100mm。在这种情况下，通过在蒸发器周围循环热水来提供热量。（内径6.5毫米和3.5毫米）或六根（内径2.8毫米）铜管，并使用水作为工作流体… 更多 d．用于加热蒸发器，考察了倾斜角度、加热速率和管长的影响。在流动可视化实验中，为了使测试段能够承受R-134a工质造成的高压，测试部分由黄铜板加工通道（2mm x 2mm x100mm）并用透明塑料板覆盖其制成。在六通道测试部分的情况下，通道的数量为三个或六个。还通过将六个通道中的两个通道替换为边长为 4mm 的通道来检查不同通道尺寸组合的效果。三通道测试部分显示出单向循环流或振荡流，具体取决于两个集管之间的温差。在六通道测试部分的结果中，通过组合两种通道尺寸来增加传输热量，本研究开发的图像处理系统可以捕获向上和向下的流速、其时间变化以及多个通道中的流动模式。。较少的