TED-AJ03-380 NOVEL BOILING-ENHANCED MULTI-CHANNEL HEAT SINKS

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概要

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• This paper describes the results of experimental investigation of heat transfer characteristics of the novel type of multi-channel heat sinks with micro- and meso-sized channels fabricated using a newlydeveloped polycapillary materials (PCM) technology. The enhancement of heat transfer properties is achieved by a combination of both structural and flow parameters under a single- or a two-phase regime. The proposed technology enables miniature heat sinks with arrays of longitudinal small-diameter (down to tens of microns) channels, produced of variety of materials including metals, alloys and ceramics, resulting in high surface density. The later ensures superior volumetric heat transfer coefficients under condition of forced single-phase convection of fluid. However, since the heat transfer during a single-phase regime is still limited by significant thermal and hydraulic resistances, its further enhancement is associated with a phase transition and a resulting two-phase flow. The latter allows for much higher heat transfer coefficients and lower pressure drop due to steam formation. The objective of this paper is to demonstrate the potential of using the proposed multi-channel heat sinks for variety of applications requiring withdrawal of significant amounts of heat within small volume. As a result of conducted research, preliminary heat transfer characteristics of the proposed heat sinks were evaluated and analyzed. It was found that heat transfer coefficients observed during a single-phase regime are in good agreement with theoretical equations describing forced laminar convection in channels. When combined with high surface density, they demonstrate superior volumetric ability to reject up to 6 × (10)^6 W/m^3 ℃ of heat under moderate flow rates. By providing sufficient superheat, a phase transition (boiling) can be induced resulting in 2.3-2.6 times increase in rejected heat flux. This result is in part due to the unique fabrication process allowing producing flow channels with roughened internal surface formed by sintered particles, which serve as perfect nucleation sites. In the future, additional study will be conducted to analyze in detail thermal and hydraulic properties as well as specific designs and material options of the proposed boiling-enhanced multi-channel heat sinks.

• 一般社団法人日本機械学会の論文

著者

• Prindiville Thomas

  Department Of Aerospace And Mechanical Engineering University Of Arizona

• Ortega Alfonso

  Department Of Aerospace And Mechanical Engineering University Of Arizona

• WEXLER EUGENE

  Materials & Electrochemical Research Corporation

• LOUTFY RAOUF

  Materials & Electrochemical Research Corporation

• WALLINGER DIRK

  Department of Aerospace and Mechanical Engineering, University of Arizona

• Loutfy Raouf

  Materials & Electrochemical Research Corporation

• Wexler Eugene

  Materials & Electrochemical Research Corporation

• Wallinger Dirk

  Department Of Aerospace And Mechanical Engineering University Of Arizona

関連論文

• TED-AJ03-380 NOVEL BOILING-ENHANCED MULTI-CHANNEL HEAT SINKS

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