曲がり流路上流で発生する流速の偏りが伝熱特性に与える影響

抄録

This study describes heat transfer characteristics in a rectangular bend that a sudden contraction or a sudden expansion simultaneously occurs. This flow pattern can be found in high-density packaging electronic equipment and heat exchanger. In order to predict heat transfer performance in electronic equipment, a prediction of heat transfer coefficient cannot be done easily by using conventional formulas for calculating heat transfer characteristics in simple ducts. This paper especially focused on the heat transfer performance in the upstream side of the bend in the rectangular duct with the sudden contraction or the sudden expansion through the CFD analysis. We found that the heat transfer performance was dependent on the cross-sectional area ratio of the bend significantly.