旋回衝突噴流のよどみ域における熱伝達機構(熱工学,内燃機関,動力など) 野崎 篤志 五十嵐 保光 菱田 公一 一般社団法人日本機械学会 日本機械学會論文集. B編 03875016 68 672 2300 2305 2002-08-25 Heat transfer mechanism of a swirling impinging jet in the stagnation region has been experimentally examined, using a combined technique of particle image velocimetry (PIV) and laser induced fluorescence (LIF) for the simultaneous measurements of velocity and temperature fields. The present study indicated that the radial width of the jet was stretched with incresing swirl number Sw, and that this stretching phenomena contributes to radially the maximum local heat transfer coefficient. At the stagnation region, the flow near the heated surface was mixed intermittently by reverse flows toward upstream, and spatial distributions of temperature were well correlated with instantaneous velocity vector maps. The dynamic behavior of recirculation zones, which were attributed to swirl number Sw and impinging distance, mainly determined the turbulent heat transfer at the stagnation region. 2002-08-25 110002387428 AN00187441 6273761 JPN CJP NDL NII-ELS 3 8 The Heat Transfer Mechanism of a Swirling Impinging Jet in the Stagnation Region NOZAKI Atsushi IGARASHI Yasumitsu HISHIDA Koichi The Japan Society of Mechanical Engineers Transactions of the Japan Society of Mechanical Engineers. B Heat transfer mechanism of a swirling impinging jet in the stagnation region has been experimentally examined, using a combined technique of particle image velocimetry (PIV) and laser induced fluorescence (LIF) for the simultaneous measurements of velocity and temperature fields. The present study indicated that the radial width of the jet was stretched with incresing swirl number Sw, and that this stretching phenomena contributes to radially the maximum local heat transfer coefficient. At the stagnation region, the flow near the heated surface was mixed intermittently by reverse flows toward upstream, and spatial distributions of temperature were well correlated with instantaneous velocity vector maps. The dynamic behavior of recirculation zones, which were attributed to swirl number Sw and impinging distance, mainly determined the turbulent heat transfer at the stagnation region. 野崎 篤志 NOZAKI Atsushi 慶應義塾大学大学院 五十嵐 保光 IGARASHI Yasumitsu 慶應義塾大学大学院 (現)松下通信工業(株) 菱田 公一 HISHIDA Koichi 慶應義塾大学理工学部 Department of System Design Engineering, Keio University