Results 181 to 190 of about 1,138 (230)

Oscillating Heat Pipes

SAE Technical Paper Series, 2000
<div class="htmlview paragraph">This paper introduces an oscillating heat pipe and describes the prospect of the technology for space applications. The concept of the oscillating heat pipe is entirely new one. It consists of a capillary channel, which turns many times between a heating section and a cooling section.
Y. Miyazaki, F. Polasek, H. Akachi
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Self-oscillations in oscillating heat pipes

High Temperature, 2006
Self-oscillations in oscillating heat pipes are investigated experimentally. A theoretical model of self-oscillations is constructed for the case where the heater is located at the top. Characteristic times of temperature oscillations are obtained, which agree well with experimentally obtained values (of the order of 15 s).
A. V. Melkikh, Yu. E. Dolgirev
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Experimental Investigation of Oscillating Heat Pipes

Journal of Thermophysics and Heat Transfer, 2000
Operation requirements of oscillating heat pipes (OHPs) are proposed. Based on the requirements, OHPs with nonflammable fluorocarbon fluids, FC-72 and FC-75, as the working fluid are developed. The OHPs have an inner diameter of 1.75 mm, a total length of 446 mm, and 40 tubing turns.
Lin, Lanchao, Ponnappan, Rengasamy, Leland, John E.   +2 more
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Heat Recovery With Oscillating Heat Pipes

Volume 11: Emerging Technologies, 2013
Waste-heat recovery applied in HVAC air systems is of interest to increase the energy efficiency of residential, commercial and industrial buildings. In this study, the feasibility of using tubular-shaped oscillating heat pipes (OHPs), which are two-phase heat transfer devices with ultra-high thermal conductivity, for heat exchange between counter ...
Charles R. McCullough, Scott M. Thompson, Heejin Cho   +2 more
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Heat Transport Capability in an Oscillating Heat Pipe

Journal of Heat Transfer, 2008
A mathematical model predicting the oscillating motion in an oscillating heat pipe is developed. The model considers the vapor bubble as the gas spring for the oscillating motions including effects of operating temperature, nonlinear vapor bulk modulus, and temperature difference between the evaporator and the condenser.
H. B. Ma, B. Borgmeyer, P. Cheng, Y. Zhang   +3 more
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Wavelet Analysis of Oscillating Motions in an Oscillating Heat Pipe

Volume 10: Heat and Mass Transport Processes, Parts A and B, 2011
The heat to be removed from the electronic components or systems can be used to excite the oscillating motion of a train of liquid plugs and bubbles in the oscillating heat pipe (OHP). The oscillating motion in the OHP can significantly enhance heat transfer.
Nannan Zhao, Hongbin Ma, Xinxiang Pan
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Bubble generation in oscillating heat pipe

Applied Thermal Engineering, 2013
Abstract In the previous models of oscillating heat pipe (OHP), only the evaporation and condensation in the liquid–vapor interfaces were considered as phase changes. Thus, only a simple sinusoidal oscillating motion of liquid slugs and vapor plugs was produced due to the small driving force.
Raffles Senjaya, Takayoshi Inoue
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A Mathematical Model of an Oscillating Heat Pipe

Heat Transfer Engineering, 2011
A mathematical model predicting the oscillating motion in an oscillating heat pipe is developed. The model considers the system multidegree oscillation of vapor bubbles and liquid plugs, including the effects of filling ratio, operating temperature, gravitational force, and temperature difference between the evaporator and condenser.
Peng Cheng, Hongbin Ma
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Nanofluid Oscillating Heat Pipe

2015
For a typical OHP, forced convection plays a key role in the heat transfer from the evaporator to the condenser sections. In other words, most of the heat transferred from the evaporator to the condenser is by sensible heat. Thermal conductivity, viscosity, and heat capacity of the working fluid play more important roles in an OHP than the surface ...
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Temperature-Controllable Oscillating Heat Pipe

Journal of Thermophysics and Heat Transfer, 2011
Experiments are conducted to investigate whether an oscillating heat pipe with a liquid reservoir can serve as a thermal control device in space. The oscillating heat pipe consists of a stainless steel capillary tube (inner and outer diameters of 0.8 mm and 1 mm, respectively), which meanders between a heating section and a cooling section 15 times in ...
Naoko Iwata, Hiroyuki Ogawa, Yoshiro Miyazaki   +2 more
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