Mass transfer in annular liquid jets in the presence of liquid flow rate fluctuations

Abstract

The effects of sinusoidal oscillations in the liquid's mass flow rate at the nozzle exit on the fluid dynamics of and mass transfer in annular liquid jets have been analyzed numerically in the absence of interfacial mass-transfer resistance. It is shown that the pressure and volume of the gases enclosed by the jet, the gas concentration at the jet's inner interface, and the mass absorption rates at the jet's inner arid outer interfaces are sinusoidal functions of time, which have the same frequency as, but exhibit a phase lag with respect to, the liquid's mass flow-rate oscillations. The amplitude of these oscillations increases and dećreases, respectively, as the amplitude and frequency, respectively, of the mass flow rate oscillation are increased. For the amplitudes and frequencies considered in this paper, no mass enhancement due to mass flow-rate oscillations is observed despite the nonlinear, integrodifferential coupling between the fluid dynamics and mass-transfer phenomena.