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, the detailed particle-bed model of Foscolo and Gibilaro, which incorporates inertia effects, was applied to investigate the transient behavior of fluidized-bed systems Transient fluidization experiments were performed with a broad range of water-fluidized particles in a laboratory-scale multistage fluidized bed contactor.
Abstract: Transient phenomena in solid–liquid fluidized-bed systems are important in designing pulsed, countercurrent (multistage) fluidized-bed contactors of the Cloete-Streat type at high-solids flow rate Of particular interest are the residence times or corresponding velocities of porosity gradients in the bed and the excess or overshoot height of the bed after refluidization Theory assuming local equilibrium between holdup and velocity of the phases (local-equilibrium model) for stepwise perturbations in the liquid flow is readily available It is investigated whether the local-equilibrium theory can be used for more complex perturbations and whether inertia effects, such as are encountered in countercurrent multistage fluidized-bed systems, can be ignored Therefore, the detailed particle-bed model of Foscolo and Gibilaro, which incorporates inertia effects, was applied to investigate the transient behavior of fluidized-bed systems Transient fluidization experiments were performed with a broad range of water-fluidized particles in a laboratory-scale multistage fluidized-bed contactor The operating conditions corresponded to those for countercurrent contact
Numerical simulations with the particle-bed model predict satisfactory experimental results The “overshoot” heights of the fluidized bed were estimated correctly by the particle-bed model, whereas the local-equilibrium model only provides a conservative estimate However, the local-equilibrium model allows an analytical solution that is more interesting for design, as it avoids tedious calculations The residence time of the last perturbation before the fluidized bed relaxes to steady state was estimated with similar accuracy by both models
9 citations
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9 citations
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25 Apr 1973TL;DR: Ion exchange and adsorption processes are carried out in a countercurrent vessel in which the washing liquid is purified in a covering layer situated on a partition in the vessel, which layer preferably consists of the same ion exchange material, before it enters the ion exchange mass as mentioned in this paper.
Abstract: Ion exchange and adsorption processes are carried out in a countercurrent vessel in which the washing liquid is purified in a covering layer situated on a partition in the vessel, which layer preferably consists of the same ion exchange material, before it enters the ion exchange mass.
9 citations
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27 Sep 1982TL;DR: In this paper, an apparatus for the countercurrent treatment of liquids with adsorbents in an adsorption-filter is described, where the space of which is divided by trays which are permeable to liquids into at least two chambers, in which before and/or during the charging of the adsorbent in the upward flow, the regeneration of the charged adsorbant in the downward flow, and the backwasting in upward flow particular levels to which the industrial chambers are filled are established.
Abstract: An apparatus for the countercurrent treatment of liquids with adsorbents in an adsorption-filter the space of which is divided by trays which are permeable to liquids into at least 2 chambers, in which before and/or during the charging of the adsorbent in the upward flow, the regeneration of the charged adsorbent in the downward flow and the backwasting in the upward flow particular levels to which the industrial chambers are filled are established by transferring adsorbent from one chamber to the adjacent chamber.
9 citations
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01 May 2019
9 citations