Mass transfer in a symmetric sinusoidal wavy-walled channel for oscillatory flow

✍ Scribed by Tatsuo Nishimura; Shinichiro Murakami; Yuji Kawamura

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 916 KB
• Volume: 48
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(93)80349-u

✦ Synopsis

Mass transfer enhancement due to oscillatory flow has been studied in a symmetric sinusoidal wavy-walled channel by using an electrochemical technique . Experiments were carried out for viscosityand inertia-dominated flows . In the viscosity-dominated flow regime, the mass transfer rate increases with the Reynolds number and decreases with the Strouhal number . The dominant mechanism of mass transfer enhancement is steady streaming which results from the nonlinear interaction of the curved wall with oscillatory flow . In the inertia-dominated flow regime, the mass transfer rate depends on the Reynolds number, while the effect of the Strouhal number becomes insignificant. Mass transfer is primarily enhanced by chaotic advective mixing, which is produced by the vortex formation-ejection cycle observed during oscillatory flow. Inertia-dominated flows yield much better mass transfer enhancement than viscositydominated flows. It is suggested that there is an optimum Strouhal number that produces the best mass transfer, in terms of the compactness and energy efficiency of a pulsatile pumping system .