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Experimental Verification of Model for Liquid-Cooled Staggered Pin Fin Heat Sinks with Top Bypass Flow

Journal of Energy and Power Engineering 2013年第8期7卷 1487-1495页

作者： keisuke horiuchi atsuo nishihara Hitachi Research Laboratory Hitachi Ltd. Ibaraki 312-0034 Japan

Pressure drops and heat transfer over staggered pin fin heat sinks with top bypass flow were experimentally evaluated. The authors considered liquid-cooling applications because there were few data available comparing to air-cooling applications. Empirical equations to predict heat transfer on the endwall were developed by obtaining experimental data on the copper base plate with acrylic pins. A new model for predicting pressure drops and heat transfer over staggered pin fin heat sinks with top bypass flow based on mass, momentum, and energy conservation within the two control volumes is proposed. The first control volume in the model is located within the finned area, and the second is located in the gap between the tip of the pins and the flow channel. This model combines two conditions according to the boundary-layer thickness. A comparison between experimental and calculated results revealed that dimensionless pressure drops and the Nusselt number could be predicted within 30% error for the former and 50% error for the latter.

关键词： Modeling heat transfer pressure drop pin fin heat sinks endwall effect correlations liquid cooling.

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CHARACTERISTICS OF INFANTS’ NIGHT SLEEP AT THE FIRST MONTH UNDER CO-SLEEPING CONDITIONS

CHARACTERISTICS OF INFANTS’ NIGHT SLEEP AT THE FIRST MONTH ...

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作者： Eto H. horiuchi S. nishihara K. Maternal and Infant ＆ Midwifery St.Luke’s College of NursingTokyo 104-0044Japan Maternal and Infant ＆ Midwifery St.Luke’s College of NursingTokyo 104-0044Japan Dept.of Sleep Disorders Research Tokyo Institute of PsychiatryTokyo 156-8585Japan

＜正＞Objectives: Because previous research about nighttime sleep of one month-old infants has described patterns for solitary sleeping infants, we wished to describe infant sleep under co-sleeping conditions, the dominant pattern in Asia. The purpose of this study was to describe sleep characteristics under co-sleeping conditions using time-lapse video recording and com-

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