Kengo Sasaguchi

Laminar Natural Convection Heat Transfer in an Enclosure with Fins. Effects of Aspect Ratio and other Parameters on Unsteady Heat Transfer.

The effects of aspect ratio, Prandtl number, and the thermal conductivities of fins on two-dimensional unsteady laminar natural convection in a rectangular cell surrounded by a vertical hot wall, a vertical insulated wall, and horizontal conducting fins have been studied numerically using the SIMPLER algorithm. For the aspect ratio ranging from 0.5 to 2.0, transient velocity and temperature distributions, and timewise variation of averaged Nusselt number on the hot wall have been compared with those for a cell with nonconducting fins. Further, effects of Prandtl number and the thermal conductivity of the fins on the temperature distributions have been examined.

Laminar natural convection heat transfer in an enclosure with conducting plates. Effect of Grashof number on unsteady heat transfer.

The effect of Grashof number, Gr, on two-dimensional unsteady laminar natural convection in a rectangular cell surrounded by a vertical hot wall, a vertical insulated wall, and two horizontal conducting plates has been studied numerically using the SIMPLER algorithm. For Gr ranging from 103 to 105, transient velocity and temperature distributions, and timewise variation of averaged Nusselt number on the hotwall have been compared with those for an ordinary cell which has a hot wall and three insulated walls.

A study on unstable phenomenon and resonance of pressure regulating valve.

空気圧伝達管路系において,圧力調整弁は二次側の負荷の変動に敏感に即応し,所定の調整圧力に保つ機能を有するが,二次側の負荷によっては弁ばねおよび調整弁内各室圧力の激しい振動を伴う鳴動現象を生ずる場合がある.この不安定現象を敏明し,その改善策を講ずることを目的として,調整圧力,管内径,弁棒の質量,弁ばねの強さなどの各要素が鳴動現象に及ぼす影響を実験的ならびに理論的に研究し,成果があった.