However this instability has not been studied until recently.
Such important parameters as oscillation threshold, heat transfer coefficient, and maximum heat load cannot be predicted from calculations.
For comparison, advanced heat pipes used for spatial applications have heat transfer capacity (measured in W∙m) order of value smaller.
The heat transfer capacity of the conventional heat pipes used for cooling of microelectronic devices like laptop computers is 2 to 3 orders of value smaller than that of PHPs.
The other end (called condenser section) is connected to the cold point where the heat can be dissipated.
A portion of the tube between evaporator and condenser is called adiabatic section.A heat pipe is a container tube filled with the working fluid.One end of this tube (called evaporator section) is brought in thermal contact with a hot point to be cooled.These features make PHP extremely promising for the thermal management of the next generation of electronic and other systems.However, the functioning of PHPs is not completely understood.When the temperature difference between evaporator and condenser exceeds a certain threshold, the gas bubbles and liquid plugs begin to oscillate spontaneously back and forth.The amplitude of oscillations is quite strong and the liquid plugs penetrate into both condenser and evaporator.PHP is a capillary tube (with no wick structure) bent into many turns and partially filled with a working fluid.Because the tube is thin, the liquid plugs and vapor bubbles are formed inside it. This requires replacing of metals by lighter synthetic materials (composites, ceramics, etc.), which, however, are poor heat conductors and thus require special thermal management solutions for their cooling capability to handle heat loads up to several k W.On the other hand, with the increase of power levels related to the miniaturization of electronics progressing towards multi chip modules, conventional cooling technologies and thermal management are facing growing challenges including the cooling heat fluxes of 100 W/cm, long term reliability, and very low costs for consumer market products, among others.
Comments Heat Pipe Thesis
Numerical and Experimental Investigations of a Rotating Heat.
Of a Rotating Heat Pipe. LA-14324-T. Thesis. Approved for public release;. including heat pipe heat exchangers, cooling of rotating electrical machines, and.…
PDF Study of the Loop Heat Pipe with a Flat Bifacial.
Thesis Dec 1, 2009 Authors Wukchul Joung. In this work, using the flat bifacial evaporator loop heat pipe developed, the effects of gravity.…
Experimental Investigations on Pulsating Heat Pipe
Entrants to the family of heat pipes used for higher heat removal. KeywordsElectonics;filling ratio; pulsating heat pipe;thermal management. 1. PhD Thesis.…
Experimental Study on Enhanced Heat Transfer Characteristis.
Th International Heat Pipe Conference, Tokyo, Japan, pp. 469-472. of Closed-End Oscillating Heat Pipe, Ph. D. thesis, Chiang Mai University, Thailand, 2002.…
Micro-Columnated Loop Heat Pipe - Spotlight exhibits at the.
This dissertation describes the design, modeling, and fabrication of a phase. experimental testing of several in-plane-wicking micro loop heat pipe μLHP pro-.…
Experimental Investigation of bendable heat pipes - CiteSeerX
BENDABLE HEAT PIPES. Dhananjay Dilip Odhekar. A Thesis. Submitted to the Graduate Faculty of. Auburn University in Partial Fulfillment of.…
Design, fabrication and testing of a low temperature heat pipe.
A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in the Department of Mechanical, Materials and Aerospace.…
Modeling of pulsating heat pipe PHP - Iramis - CEA
Pulsating heat pipe Pulsating or oscillating heat pipe, invented in early 1990s. A comprehensive introduction to PHPs can be found in PhD theses in English.…
Performance Analysis of a Liquid Metal Heat Pipe Space. - Dtic
OF A LIQUID METAL HEAT PIPE. SPACE SHUTTLE EXPERIMENT. THESIS. Timothy J. Dickinson, Captain, USAF. AFIT/GAE/ENY/96D-2. A oic QfoITr plre;iio.…