the high temperature fluids in the vicinity of the heated plate and introduce the low-temperature ambient fluids into the region behind the promoters.
The optimumheight and the attack angle that make the overall heat transfer coefficients a maximum were determined for the present promoters and they are H=10mm and α=90 degrees, respectively, within the range of the present experiments.
height
: the Elenbass number based on the horizontal fin spacing
: gravity acceleration
: the volume expansion coefficient
: Prantl number for the array base
1. 서 론
반도체 기술의 발달로 인해 초소형 전자기기의 전력 집적기술이 놀라운 속도로 발전하고 있다. 이것은 전자기기의 냉각기술의 발전으로 연결되었다.
냉각을
developed.
* previous techniques
techniques and devices
shortness
use a finned surface
thicknesses become very large
install promoter
(small roughness elements,
rectangular ribs)
no appreciable increase
in heat transfer rates
Present authors have proposed a unique type of promoter : "V-shaped" is the best.
And they experiment to find adequate "height and angle"
2-2. Experim
appreciable increase
in heat transfer rates
Present authors have proposed a unique type of promoter : "V-shaped" is the best.
And they experiment to find adequate "height and angle"
2-2. Experimental Apparatus and Measurements
*Apparatus
- heat transfer plate and side plate
- V-shaped promoter(1mm thick vinylchloride resin plate)
- fluid : water
The whole apparatus was submerged