[공학] 열교환기의 효율을 높여주는 V자형 promoter(영문)
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분야
hwp2. The contents of paper
3. Our team idea
* 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. 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 in a large water tank of 800*800mm2 in cross-sectional area and 1800mm in depth.
V-shaped promoter were located on the test surface 1200mm downstream from the plate edge.
*Measurements
Promoter : the length of the side B, the height H, the attack angle α
B=20mm(fixed) / H=2.5,5,10,20 and 30 mm / α=180,150,120,90,60 and 30 degrees)
2-3. Results & Discussion
When α=90° and H=10 mm is the optimal condition.
