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Mass transfer coefficient
About: Mass transfer coefficient is a research topic. Over the lifetime, 7827 publications have been published within this topic receiving 168354 citations.
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TL;DR: In this article, experimental data on the average mass transfer liquid film coefficient (kL) in an aerated stirred tank are presented. But the data are quantitatively interpreted in terms of bubble contamination kinetics, using a stagnant cap model, according to which bubbles suddenly change from a mobile interface to a rigid condition when surface tension gradients, caused by surfactant accumulation, balance out shear stress.
Abstract: Experimental data on the average mass transfer liquid film coefficient (kL) in an aerated stirred tank are presented. Liquid media used were tap water, electrolyte solutions and water with controlled addition of tensioactive material. Values of kL range from those expected for bubbles with a mobile surface to those expected for rigid bubbles. These data are quantitatively interpreted in terms of bubble contamination kinetics, using a stagnant cap model, according to which bubbles suddenly change from a mobile interface to a rigid condition when surface tension gradients, caused by surfactant accumulation, balance out shear stress.
114 citations
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21 Mar 2002TL;DR: In this article, an energy transfer model is proposed to describe the energy conservation properties of a mass transfer with respect to temperature, mass conservation, and kinetic properties of the mass transfer.
Abstract: Contents ENERGY TRANSFER Equilibrium, Energy Conservation, and Temperature Modes of Heat Transfer Governing Equation and Boundary Conditions of Heat Transfer Conduction Heat Transfer: Steady-State Conduction Heat Transfer: Unsteady-State Convection Heat Transfer Heat Transfer with Change of Phase Radiative Energy Transfer MASS TRANSFER Equilibrium, Mass Conservation, and Kinetics Modes of Mass Transfer Governing Equations and Boundary Conditions of Mass Transfer Diffusion Mass Transfer: Steady-State Diffusion Mass Transfer: Unsteady-State Convection-Dispersion and Convection-Diffusion Mass Transfer APPENDIX Summary of Processes and Equations Physical Constants, Unit Conversions, and Mathematical Functions Heat Transfer and Related Properties Mass Transfer Properties Miscellaneous Environmental Data Equations of Motion in Various Coordinate Systems Some Useful Mathematical Background Index
113 citations
TL;DR: In this paper, heat and mass gas-to-solid coefficients associated with the vaporization of water and some hydrocarbons from the surface of a monolithic structure were experimentally established.
113 citations
TL;DR: In this article, a kinetic model for the photocatalytic degradation of formic acid in an immobilized system is presented, including the dependency of the reaction rate on the concentration of Formic acid and oxygen, the catalyst layer thickness and the light flux.
113 citations
TL;DR: In this article, the authors present experimental studies on gas-side mass transfer in a rotating packed bed with wire-gauze packing and show that the lower value of the coefficient found experimentally is attributed to liquid maldistribution.
Abstract: The liquid-side mass transfer rate in a centrifugal gas-liquid contactor has been reported to be several times higher than that in conventional packed beds. However, no direct measurement of the gas-side mass transfer coefficient has been reported. We present experimental studies on gas-side mass transfer in a rotating packed bed with wire-gauze packing. Contrary to expectations, the gas-side mass transfer coefficient was much lower than that in conventional packed columns. An analysis of the gas flow, based on the equations of motion, revealed that the gas undergoes solid-body-like rotation in the rotor because of the drag offered by the packing. Therefore, the mass transfer coefficient should be in the same range as that in conventional packed columns. The lower value of the coefficient found experimentally is attributed to liquid maldistribution. The possibility of enhancing the mass transfer coefficient by enhancing the slip between the gas and the packing was explored by using a stack of closely spaced disks as the packing. Mass transfer studies with a pair of disks were conducted. Higher throughputs and mass transfer rates than those with the wire-gauze packing were obtained. A stack of disks as packing appears to hold promise.
113 citations