Study on Heat Transfer Characteristics of Gaseous Flows in Micro Channels

微通道内气体流动传热特性研究

基本信息

批准号：
16560189
负责人：
ASAKO Yutaka
金额：
$ 2.37万
依托单位：
Tokyo Metropolitan University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
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/en/grant/KAKENHI-PROJECT-16560189/
关键词：
Micro-channel Gaseous flow Heat transfer Parallel plate channel Micro tube

项目摘要

Fabrication of small devices has increased the need for understanding of fluid flow and heat transfer in micro geometries. The pressure drop of fluid flow in a micro channel is quite large because of the friction loss. In case of gaseous flows, gas expands along the channel and flow is accelerated in the channel. This results in temperature fall due to the energy conversion from the internal energy to the kinetic energy. Heat transfer characteristics of gaseous flow in a micro channel might differ from that of incompressible flows. However, there is no parametric study on the heat transfer characteristics of gaseous flow in micro-channels. This is the motivation of the present study. Objectives of the present study are; 1. To obtain the heat transfer characteristics of gaseous flow in micro channels. 2. Verification of the gas temperature at the channel exit that has been numerically obtained in a foregoing research.(1) The computations are performed for channels with constant heat flux which ranges from 10^2 to 10^4W m^<-2> and with the constant wall temperarure. The channel height ranges from 10 to 100μm and the aspect ratio of the channel height and length is fixed at 200. The heat transfer characteristics of gaseous flow in a micro channel is obtained. The wall and bulk temperatures in micro-channels are compared with that of the incompressible flow in the conventional sized parallel plate channel. The heat transfer characteristics of a micro tube is also obtained.(2) The gas temperature at the exit of a micro tube was measured by a laser-induced fluorescence method and the comparisons were made with numerically obtained temperature in a foregoing research. And the availability of the laser-induced fluorescence method for temperature measurements is discussed.

小型设备的制造增加了对微观几何形状中流体流量和热传递的需求。由于摩擦损失，微通道中流体流量的压降非常大。如果气体流量，气体沿通道和流动在通道中加速膨胀。由于能量从内部能量转化为动能，这会导致温度下降。微通道中气流的传热特性可能与不可压缩流的传热特性不同。但是，没有关于微通道中气流传热特性的参数研究。这是本研究的动机。本研究的目标是； 1。获得微通道中气流的传热特性。 2。在上述研究中对通道出口处的气温进行验证。（1）对具有恒温恒温的通道进行计算，该通道的范围为10^2至10^4W M^<-2>且恒定壁温度。通道高度范围为10至100μm，通道高度和长度的长宽比固定为200。将微通道中的壁和散装温度与传统大小的平行板通道中不可压缩流的温度进行了比较。还获得了微管的传热特性。（2）通过激光诱导的荧光方法测量微管出口处的气温，并在上述研究中与大量获得的温度进行比较。并讨论了激光诱导的荧光方法进行温度测量的可用性。