OS1-9 ループ型マイクロヒートパイプ内循環流形成に関する研究(OS1 マイクロエネルギー変換,分散と集中の共存)

概要

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A simple design micro-heat pipe was proposed. It was composed of 20.0×20.0mm square flow circuit which had two adjacent narrow-sides (W1.0×D0.5mm^2 or W1.0×D1.0mm^2 or W0.5×D1.0mm^2) and two adjacent wide-sides (W5.0×D0.5mm^2 or W5.0×D1.0mm^2 or W2.5×D1.0mm^2). A heating spot was at the narrow side and a cooling spot was at the wide side. Working fluid was ethanol. The flow circuit was placed horizontally. Bubbles generated at the heating spot migrated toward the wide side, the bubbles coalesced there to form a large bubble, and then the large bubble moved to the cooling spot. Finally, the large bubble was condensed at the cooling spot. This cycle repeated continuously. As a result of it, heat transport from the heating spot to the cooling spot was produced in the micro heat pipe. An analysis of a flow mechanism was performed by solving a simple flow equation based on the flow resistance. It was proved that one-way circulation flow could be formed in the flow circuit. Predicted flow velocities were close to measured velocities. The heat transport efficiency per unit mass of the proposed micro heat pipe was much better than the heat conduction of any metallic plate.
2006-06-28