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Wall mass transfer in laminar pulsatile flow in a tube

1975; Wiley; Volume: 21; Issue: 2 Linguagem: Inglês

10.1002/aic.690210206

1547-5905

Rutton D. Patel, John J. McFeeley, Kenneth R. Jolls,

Fluid Dynamics and Mixing

Abstract Wall mass transfer was measured in fully developed pulsating laminar flow in a tube using the diffusion‐controlled electrode technique. The average Reynolds number, pulsating frequency and amplitude, and length of the mass transfer surface were the independent variables studied. The results are given in the form of the amplitude ratio and phase angle of the pulsating wall transfer rate. At lower frequencies the amplitude and phase were found to be correlated by the variable ω d 2 Gz −2/3 in accordance with theory. At higher frequencies an empirical correlation with the variable ω d 2 Gz −1/3 ( L / D ) 1/3 was found. While this may show some deficiency in the usual theoretical model, it is also possible that other causes such as nondevelopment of the flow are responsible. Time‐averaged transfer rates were found to be only slightly different from the corresponding steady flow transfer rates in the range of variables investigated.