脈動流場における正弦波状管内の物質移動促進(熱工学,内燃機関,動力など)

概要

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This study describes experimentally mass transfer enhancement in a wavy-walled tube for pulsatile flow. Three flow parameters are considered, i. e. net flow Reynolds number, oscillatory fraction and oscillatory frequency. The attention is paid especially to the effect of oscillatory frequency on mass transfer enhancement under conditions of no reverse flow. We show that the mass transfer enhancement factor varies with the net flow Reynolds number and oscillatory fraction. When the net flow is located just before the transitional flow regime for steady flow, the effective mass transfer enhancement is available. Furthermore we found that the resonant transport enhancement observed in a grooved channel, does not exist in the wavy-walled tube. A peak transport enhancement takes place in an optimum Strouhal number, which depends on the oscillatory fraction. The pulsatile flow state tends to be stable in the acceleration phase and unstable in the deceleration phase. The unstable flow state is found to lead to a strong fluid exchange between the mainstream and the recirculation vortex, and thus contributes to the mass transfer enhancement.
一般社団法人日本機械学会の論文
2002-10-25