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 paper, the perforated draft tube was used to increase the gas holdup and volumetric coefficient of the countercurrent bubble column with and without a draft tube in order to improve the performance of the bubble column.
19 citations
TL;DR: In this article, a macroscopic model based on the volume-averaged equations of motion is presented for countercurrent gas-liquid flow in a packed bed, which yields a column-limited flooding point as the loss of existence of uniform states.
Abstract: A macroscopic model based on the volume-averaged equations of motion is presented for countercurrent gas-liquid flow in a packed bed The model yields a column-limited flooding point as the loss of existence of uniform states It correctly predicts the existence of two uniform states below the flooding point The lower branch corresponds to the trends commonly observed experimentally It is shown that the upper branch is made unattainable by the gas distributor/support plate at the bottom of the column The occurrence of premature flooding induced by the support plate is also explained It is suggested that the occurrence of spontaneous liquid segregation, necessitating frequent liquid redistribution in columns with large dumped packings and porosities, is a consequence of the loss of stability of the uniform state in the lower branch
19 citations
TL;DR: In this article, Wu et al. investigated the interfacial condensation heat transfer for a steam-water countercurrent stratified flow in a horizontal pipe and obtained 105 local interfacial heat transfer coefficients for a wavy interface.
18 citations
TL;DR: In this article, the authors used the orthogonal collocation method to predict the final steady state behavior of a Sorbex-type four-section simulated countercurrent process.
Abstract: The bahaviour of simulated countercurrent adsorption processes may be modelled using two different approaches. The first method, known as the moving-bed approach, treats the simulated countercurrent process as equivalent to a true countercurrent system. The second technique, known as the fixed-bed approach, considers the simulated countercurrent process as a series of fixed beds and incorporates the actual flow switching of the process at fixed time intervals. In this work, theoretical predictions of the two approaches have been computed numerically by the method of orthogonal collocation. The moving-bed approach, although less realistic, gives reuslts that are very similar to those obtained from the fixed-bed approach for the description of the final steady state behaviour of a Sorbex-type four-section simulated countercurrent process. However, in the case of a three-section simulated countercurrent process, there is significant deviation between the predictions calculated from the two approaches. This difference arises as a result of the flow switching procedure implemented in the three-section process, a feature that cannot be accounted for by the idealized moving-bed approach. The validity of the moving-bed approach is thus seen to be limited to the four-section type of simulated countercurrent process.
18 citations
TL;DR: The capability of a simple countercurrent chromatographic scheme for obtaining high-resolution preparative-scale separations was demonstrated with the separations of a series of dinitrophenyl amino acids and peptides, suggesting a general applicability of low-interfacial tension phase systems by the present method.
18 citations