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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15 Sep 2004
TL;DR: In this paper, a method for model development and parameter estimation of an ion exchange process for desalination of water is described based on the countercurrent flow of liquid and solid into the process columns.
Abstract: A method for model development and parameter estimation of an ion exchange process for desalination of water is described. The model is based on the countercurrent flow of liquid and solid into the process columns. A discrete time model is presented. The method is based on using the least squares approach. Matlab and Simulink software programs for calculating unknown model parameters are developed. The results are given and discussed
01 Sep 1986
TL;DR: In this paper, the authors presented the exact analytical solution for the general case of continuous mass transfer between a solid with a biporous structure (micro and macroporosity) and a countercurrent flowing fluid phase.
Abstract: This paper presents the exact analytical solution for the general case of continuous mass transfer between a solid with a biporous structure (micro and macroporosity) and a countercurrent flowing fluid phase. The transport inside the solid is by molecular diffusion and outside of it the convective film resistance is included. A general expression is given which is valid for the infinite plate, for the infinite cylinder and for the sphere. The standard monopore case is obtained as a particular solution.
Patent•
19 Feb 1998
TL;DR: A countercurrent heat exchanger of the plate type where the exchange of heat between gases takes place when the horizontally flowing gas forms an angle with the row of heat exchangers is described in this paper.
Abstract: A countercurrent heat exchanger of the plate type where the exchange of heat between gases takes place when the horizontally flowing gas forms an angle with the row of heat exchanger plates. The heat exchanger plates have a rounded edge on the side facing toward the gas flow.
Patent•
22 Apr 1996
TL;DR: In this paper, a heat exchange apparatus with a direct evaporative heat exchange section (90) overlying an indirect heat exchange area (50) is presented, where a countercurrent air flow pattern through the direct section provides a uniformly cooled evaporative liquid for use in the indirect section (50).
Abstract: A heat exchange apparatus (10) which can be used as an evaporative condenser, fluid cooler or wet-air cooler, is provided with a direct evaporative heat exchange section (90) overlying an indirect evaporative heat exchange section (50). An air entry zone (120) common to both heat exchange sections (50;90) receives an air stream blown into this zone by at least one fan (24), thereby pressurizing the plenum such that the air stream is forced to split and enter each section (50;90) while inside the apparatus. This eliminates the need for separate air entries, thus condensing the size and cost of the apparatus, while increasing heat exchange capacity. A countercurrent air flow pattern through the direct section (90) provides a uniformly cooled evaporative liquid for use in the indirect section (50). The evaporative liquid flow is parallel to the air stream provided in the indirect section. A process fluid inside the circuits of the indirect section (50) can accept or reject heat from the evaporative liquid received from the direct section (90), with a part of the heat being transferred into the indirect section air stream in sensible and latent form, thus increasing or decreasing the enthalpy of the air stream. The remaining heat can be either stored or released from the evaporative liquid to increase or decrease its temperature. The evaporative liquid is collected in a sump (30) and then pumped upwardly for re-distribution across the direct evaporative heat exchange section (90).
01 Jun 2019
TL;DR: In this paper, the effectiveness-NTU method was adapted to gas-liquid countercurrent absorbers to determine the overall mass transfer coefficient, KLa, of the apparatus in operation.
Abstract: In this study, the Effectiveness-NTU method, which is usually applied to heat exchanger design, was adapted to gas–liquid countercurrent absorbers to determine the overall mass transfer coefficient, KLa, of the apparatus in operation. It was demonstrated that the e-NTU method could be used to determine the KLa using the Henry coefficient of the solute to be transferred (HVOC), the gas flow-rate (QG), the liquid flow-rate (QL), the scrubber volume (V), and the effectiveness of the absorber (e). These measures are calculated from the gaseous concentrations of the solute measured at the absorber inlet (CGin) and outlet (CGout), respectively. The e-NTU method was validated from literature dedicated to the absorption of volatile organic compounds (VOCs) by heavy solvents. Therefore, this method could be a simple, robust, and reliable tool for the KLa determination of gas–liquid contactors in operation, despite the type of liquid used, i.e., water or viscous solvents.