Topic
Countercurrent exchange
About: Countercurrent exchange is a research topic. Over the lifetime, 2255 publications have been published within this topic receiving 28687 citations. The topic is also known as: Countercurrent exchange.
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TL;DR: In this article, a design method is presented which enables distillation columns to be designed by manual calculation, allowing for finite transfer rates and backmixing in both phases but the assumption of constant molar enthalpy is retained.
5 citations
Patent•
22 Apr 1980
TL;DR: In this article, a thin metal heat exchanger having countercurrent flow of media on opposite sides of spaced walls is disclosed, where the walls are configured with ridge-depression shapes extending at an angle to the direction of flow on opposite side of the plate so as to create circulation but not turbulence of the flowing media in the depressions.
Abstract: A thin metal heat exchanger having countercurrent flow of media on opposite sides of spaced walls is disclosed. The walls are configured with ridge-depression shapes extending at an angle to the direction of flow of media on opposite sides of the plate so as to create circulation but not turbulence of the flowing media in the depressions.
5 citations
Journal Article•
TL;DR: In this article, a CFD model using the volume of fluid (VOF) method was presented for predicting the mass transfer process of the two-phase countercurrent falling film, in which the momentum source term including surface tension and interface shear stress and a mass-transfer source term were given the model was applied to simulate the stripping process of 2-Propanol dilute solution.
Abstract: A CFD model using the volume of fluid (VOF) method was presented for predicting the mass-transfer process of the two-phase countercurrent falling film, in which the momentum source term including surface tension and interface shear stress and a mass-transfer source term were given The model was applied to simulate the stripping process of 2-Propanol dilute solution It is found that the simulated outlet liquid concentrations under different inlet liquid concentrations and various gas flow rates are in good agreement with the experimental data The simulations also confirm that with free surface waving the interface concentration fluctuate violently The enhancement factor R from experiment and CFD simulation are both larger than 1, even under the little mass-transfer impetus Since the Rayleigh-B?nard-Maragoni effect was not considered in the CFD model, the conclusion can be regarded as that in the simulation, the results of the enhancement of the mass-transfer process is caused by fluctuating interfacial waves, which also proves that fluctuating the interfacial waves is an effective means to enhance the separation efficiency
5 citations
Patent•
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TL;DR: In a fixed-bed ion exchange process for treating a fluid, wherein adsorption and regeneration are performed in countercurrent flow, the whole ion exchange resins are removed from the ion exchange column portionwise, either intermittently or continuously, subjected to backwash and then returned to the ion exchanged column.
Abstract: In a fixed-bed ion exchange process for treating a fluid, wherein adsorption and regeneration are performed in countercurrent flow, the whole ion exchange resins are removed from the ion exchange column portionwise, either intermittently or continuously, subjected to backwash and then returned to the ion exchange column. The whole bed of the resins is replaced by one round in this process, and therefore the distribution of the ions in the resin bed after backwash treatment is substantially the same as before, whereby a very efficient ion exchange is possible without increase in amount of the regenerant.
5 citations
TL;DR: In this paper , a microdroplet-based continuous countercurrent extraction process with a high phase ratio (60-110) was proposed, and a microdisperser and a milli-scale column was established, and the effects of the experimental parameters, namely, the circulation ratio, flow rate, phase ratio, and column length, on the extraction efficiency, volumetric mass transfer coefficient, and theoretical stage were studied.
5 citations