Topic
Heat pipe
About: Heat pipe is a research topic. Over the lifetime, 30354 publications have been published within this topic receiving 243669 citations. The topic is also known as: heatpipe & heat-pipe.
Papers published on a yearly basis
Papers
More filters
Patent•
04 Oct 1996TL;DR: In this paper, a passive method and packaging system for thermally controlling the temperature of electronic equipment within a housing is described, where cooling by changing the phase of phase change material, assists in controlling internal ambient temperatures by limiting the effects of short term localized thermal phenomena which would otherwise further increase internal temperatures.
Abstract: A passive method and packaging system for thermally controlling the temperature of electronic equipment within a housing are disclosed. The packaging system provides for two cooling steps, each of which uses a different passive cooling technology. Cooling by changing the phase of Phase Change Material, assists in controlling internal ambient temperatures by limiting the effects of short term localized thermal phenomena which would otherwise further increase internal temperatures. Cooling is also provided for by switching on a second passive cooling means, preferably a heat pipe, as the internal temperature of the housing increases above a predetermined temperature and to switch it off as the internal temperature drops below the predetermined temperature. Turning the second passive cooling means on and off provides respectively, a low or high thermal resistance path between the interior and exterior of the housing. The second passive cooling means allows for cooling of the housing above the predetermined temperature as well as heating of the housing below the predetermined temperature by preserving heat generated by the equipment. The two cooling steps in combination, co-operate to limit both maximum and minimum temperatures within the housing and of components. The combination of cooling steps also allows control over the temperature delta between the maximum and minimum temperatures during internal temperature swings.
145 citations
TL;DR: A review of the literature in the area of microscale heat transfer is presented to provide a concise overview of the recent advances in this field of study as discussed by the authors, which is divided into three major sections with each subdivided into subsections.
Abstract: A review of the literature in the area of microscale heat transfer is presented to provide a concise overview of the recent advances in this field of study. The review is divided into three major sections with each subdivided into subsections. The first section deals with the effects of size reductions in conduction heat transfer, and includes subsections on laser induced heating on the microscale and conduction in thin films. The second section addresses microscale forced convection and includes subsections on micro heat pipes, microscale boiling, and thin liquid films near the contact line. The final section examines the effects of small length scales on radiative heat transfer. The three major sections are followed by a summary that identifies, consolidates, and summarizes the most important advances in each of these three areas.
145 citations
TL;DR: In this paper, the authors reviewed and summarized recent research on fluid flow and the heat transfer characteristics of nanofluids in heat pipes, and identified perspective of nanoparticles that can be used in heat pipe for further research.
Abstract: Extensive research work on heat transfer in heat pipe using conventional working fluids has been carried out over the past decade. Heat transfer in heat pipes using suspensions of nano meter–sized solid particles in base liquids have been investigated in recent years by various researchers across the world for finding new opportunities. The suspended nanoparticles effectively enhance the transport properties and heat transfer characteristics of base fluids in heat pipes. The study reveals an improvement in the thermal efficiency and reduction in the thermal resistance of heat pipe with nanofluids, than that of conventional working fluids. This paper reviews and summarizes recent research on fluid flow and the heat transfer characteristics of nanofluids in heat pipes and identifies perspective of nanofluids that can be used in heat pipes for further research.
145 citations
TL;DR: It is demonstrated that the traditional way of calculating evaporative heat loss of a clothed person can lead to substantial errors, especially for clothing with low permeability, which can be positive or negative, depending on the climate and clothing type.
Abstract: Investigating claims that a clothed person's mass loss does not always represent their evaporative heat loss (EVAP), a thermal manikin study was performed measuring heat balance components in more ...
144 citations
TL;DR: In this article, the thermal behavior of arrays of micro heat pipes fabricated in silicon wafers was investigated using an infrared thermal imaging unit, the temperature gradients and maximum localized temperatures were measured and an effective thermal conductivity was computed.
Abstract: An experimental investigation was conducted to determine the thermal behavior of arrays of micro heat pipes fabricated in silicon wafers. Two types of micro heat pipe arrays were evaluated, one that utilized machined rectangular channels and the other that used an anisotropic etching process to produce triangular channels. Once fabricated, a clear pyrex cover plate was bonded to the top surface of each wafer using an ultraviolet bonding technique to form the micro heat pipe array. These micro heat pipe arrays were then evacuated and charged with a predetermined amount of methanol. Using an infrared thermal imaging unit, the temperature gradients and maximum localized temperatures were measured and an effective thermal conductivity was computed. The experimental results were compared with those obtained for a plain silicon wafer
144 citations