Effect of Aspect Ratio and Installation Direction on Channel Flow Heat Transfer Performance under a Wide Range of Reynolds Number

Shunichi Sakuragi,Daisuke Torii

doi:10.34257/gjreavol19is4pg1

Abstract

In recent years, in the cooling technology for high-power electronic devices such as power transistors used for drive motor control of electric vehicles and hybrid vehicles, a method of flowing a cooling fluid to a cooling substrate having a fin structure has become the main technology. The structure of the cooling fluid flow path is a channel flow through multiple narrow plate gaps to secure a heat transfer area. In this study, the heat transfer characteristics when the aspect ratio of the channel having a flat rectangular cross-section was changed were investigated in detail by experiments. Moreover, the difference in the heat transfer characteristic at the time of making a rectangular flow path into vertical installation and horizontal installation was also investigated.

Highlights

As per the compliance and regulations of: Global Journal of Researches in Engineering (A ) Volume XIxX Issue IV Version I
In the case of vertical flow, it has been confirmed that the synergetic effect of forced convection and natural convection achieves a maximum heat transfer coefficient in a constant channel width region
The average heat transfer coefficient αα on the surface of the heat transfer substrate is defined by the following equation

Summary

Experimental Results and Discussion

Here,m is the mass flow rate of waterc, is the specific heat of water, Tout is the temperature of water at the outlet of the test section and Tin is the temperature of water at the inlet of the test section. A) Amount of heat absorbed by cooling water and substrate temperature Figures 7 and 8 show the relationship between the flow rate of cooling water and the amount of heat absorbed by cooling water when the channel flow path height H is 20 mm and 30 mm, respectively. B) Relationship between Reynolds number of cooling water flow and heat transfer coefficient Figures 11 and 12 show the relationship between the Reynolds number of the cooling water flow and the average heat transfer coefficient when the channel height H is 20 mm and 30 mm, respectively. It is noteworthy that at this D value, the value of the heat transfer coefficient is greater at all flow rates than at the horizontally placed flow case

The peculiar behavior of the heat transfer

The vicinity of this flow passage width is considered

Références Referencias