scholarly journals A Study on the Heat Transfer Enhancement of Miniature loop Heat Pipes by Using the Cu Nanofluids

2013 ◽  
Vol 17 (2) ◽  
pp. 70-77
Author(s):  
Young-Sik Kim ◽  
Hyo-Min Jeong ◽  
Han-Shik Chung ◽  
Md.Riyad Tanshen ◽  
Dae-Chul Lee ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Enhancement ◽  
Heat Pipes ◽  
Transfer Enhancement ◽  
Loop Heat Pipes

Ultrasonic Effect on Heat Transfer Performance of Oscillating Heat Pipes

2015 ◽  
Vol 137 (9) ◽  
Author(s):  
Nannan Zhao ◽  
Benwei Fu ◽  
Hongbin Ma ◽  
Fengmin Su
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Enhancement ◽  
Heat Input ◽  
Heat Transfer Performance ◽  
Operating Temperature ◽  
Heat Pipes ◽  
Transfer Performance ◽  
Transfer Enhancement ◽  
Ultrasonic Effect ◽  
Ultrasonic Sound

The ultrasonic effect on the heat transfer performance in oscillating heat pipes (OHPs) was investigated experimentally. Ultrasonic sound was applied to the evaporating section of the OHP by using electrically controlled piezoelectric ceramics. The heat pipes were tested with or without the ultrasonic effect. The effects of heat input, filling ratio, orientation, operating temperature, and working fluids (water and acetone) were investigated. The experimental results showed that ultrasonic sound can affect the oscillating motions and enhance the heat transfer performance of an OHP. However, the heat transfer enhancement mainly occurs at low heat input. In addition, it was found that heat transfer enhancement of the ultrasonic effect depends on the working fluid and operating temperature. At an operating temperature of 20 °C, the enhancement percentage of the water OHP is higher than acetone OHP. However, when the operating temperature was increased to 40 °C, the enhancement percentage of the water OHP was lower than the acetone OHP.

On the Design of an Aero-Engine Nose Cone Anti-Icing System Using a Rotating Heat Pipe

2009 ◽  
Vol 1 (2) ◽  
Author(s):  
S. Gilchrist ◽  
D. Ewing ◽  
C. Y. Ching
Keyword(s):  
Heat Transfer ◽  
Heat Pipe ◽  
Heat Transfer Enhancement ◽  
Contact Area ◽  
Heat Pipes ◽  
High Conductivity ◽  
Transfer Enhancement ◽  
Aero Engine ◽  
Nose Cone ◽  
Aero Engines

The feasibility of using a rotating heat pipe to anti-ice the nose cones of small turbofan aero-engines is investigated. A stationary jacket evaporator design was used to transport heat into the rotating heat pipe located along the central fan shaft of the engine. The rotating heat pipe condenser was made an integral part of the nose cone using a high conductivity, lightweight material and the tip of the nose cone. The use of heating channels along the nose cone and passive heat transfer enhancement in the evaporator were also investigated. The computational model used to predict the heat transfer performance is outlined. The overall heat transfer to the nose cone was 0.8–1.2 kW using water in the heat pipe and 0.4–0.75kW using ethanol. The heating channels were not effective due to the small contact area with the nose cone. The heat transfer enhancement in the evaporator increased the total heat transfer modestly and the temperature of the nose cone increased over the contact area made with the high conductivity material. The results show that rotating heat pipes are a feasible nose cone anti-icing technology.

Heat Transfer Enhancement in Spirally Corrugated Tube

2014 ◽  
Vol 7 (6) ◽  
pp. 970 ◽  
Author(s):  
Tholudin Mat Lazim ◽  
Zaid Sattar Kareem ◽  
M. N. Mohd Jaafar ◽  
Shahrir Abdullah ◽  
Ammar F. Abdulwahid
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Enhancement ◽  
Transfer Enhancement ◽  
Corrugated Tube
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