TED-AJ03-598 MASS TRANSFER ENHANCEMENT IN A WAVY-WALLED TUBE FOR PULSATILE FLOW

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The present experimental study deals with mass transfer enhancement in a wavy-walled tube for pulsatile flow. The aluminum dust method is used to visualize the flow patterns and the electrochemical method is employed to measure the mass transfer rates. Three flow parameters are considered here, that is, net flow Reynolds number(Re_s=40&acd300), oscillatory fraction of the flow rate(P=0.0∿9.0) and Strouhal number(St=0.08∿15). Among them, we especially focused on the effect of Strouhal number on mass transfer enhancement under the condition of no reverse flow. The mass transport enhancement by fluid oscillation is found to vary with the net flow Reynolds number and oscillatory fraction of the flow rate. When the net flow falls on just before the transitional flow regime for steady flow, the most effective mass transfer enhancement is available as shown in Fig.A-1. Furthermore, there exists an optimum [figure] Strouhal number corresponding to the maximum transport enhancement as shown in Fig.A-2,which depends on the oscillatory fraction of the flow rate. The results of time variation for flow behavior show that the stable and unstable flow states exist during one oscillation cycle. The flow tends to be stable in the acceleration phase, but tends to be unstable in the deceleration phase. The duration of unstable flow strongly depends on the Strouhal number. The unstable flow state is found to lead to a remarkable fluid exchange between the mainstream and the recirculation zone, and thus contributes to the mass transfer enhancement. Moreover the above results indicate that the transport enhancement mechanism for the wavy-walled tube is quite different from the resonant transport enhancement observed in the two-dimensional wavy-walled channel. [figure]
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TED-AJ03-598 MASS TRANSFER ENHANCEMENT IN A WAVY-WALLED TUBE FOR PULSATILE FLOW

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