J0601-1-2 ブタンを作動流体とした自励振動ヒートパイプの熱伝達性能([J0601-1]電子情報機器,電子デバイスの強度・信頼性評価と熱制御(1))

Abstract

This paper presents an experimental study on a pulsating heat pipe (PHP) with 1mm square 41 meandering grooves using butane as a working fluid. The length, width and thickness of the heat pipe are 300mm, 50mm and 1.9mm, respectively. The inclination angle from -90° (bottom heating mode) and 90° (top heating mode) and working temperature were varied in the experiment. The following conclusions were obtained from the experiment. (1)Temperature fluctuations around ±1K were observed in each section of the heat pipe. (2)The temperature distribution in the heat pipe was similar to conventional heat pipe, which indicated that the heat was transferred by mainly sensible heat of the working fluid (3)The heat transfer coefficient in the evaporator was 1000〜2000 W/m^2K and 500〜1500 W/^m2K in the condenser. (4)The heat pipe can transport heat more than 70W under top heating mode at vapor temperature 50℃, but the maximum heat transfer rates rapidly decreased at higher temperature level under 0° and 90° inclination.