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, an experimental investigation of cooling a very hot vertical tube by sudden introduction of a falling liquid film in the presence of a countercurrent flow of rising hot gases air is presented.
11 citations
Patent•
26 Aug 1981
TL;DR: In this article, a built-in element for a mass transfer column, the structure of which is composed of parallel, vertical contacting layers obliquely to the column axis superposed guide surfaces, is described.
Abstract: Built-in element (1) for a mass transfer column, the structure of which is composed of parallel, vertical contacting layers (2) obliquely to the column axis superposed guide surfaces (3). Here, the layers (2) are arranged so that the guide surfaces (3) of adjacent layers (2) cross each other, wherein open at both ends through the flow channels (4) are formed. Such a formed packing element (1) causes an improved and accelerated mass transfer between two passes through it in countercurrent fluid media.
11 citations
TL;DR: In this article, the distribution of fluid temperatures in a direct contact heat exchanger is analyzed analytically by integration of the one-dimensional energy equations, and the influences of decisive parameters on the temperature distributions along the column are examined.
11 citations
TL;DR: In this article, the diffusion-convection transport of the rate-limiting ion, Na+ in a single RED unit is treated, and the diffusive transport of cation across the membrane is expressed as boundary conditions for the bi-mechanism model.
Abstract: Time-dependent velocity profile and concentration distributions formed in a single reverse electrodialysis (RED) unit have been successfully pursued using simulation framework for evaluating performance of the unit, i.e., open circuit voltage and short circuit current. The single RED unit consists of two adjunct fluid channels, separated by the semi-permeable membrane. Through one of the channels, sea water flows, and the other is occupied by fresh water, flowing in the opposite direction (countercurrent operation). The diffusion-convection transport of the rate-limiting ion, Na+ in this study, for both channels is treated. The diffusive transport of cation across the membrane is expressed as boundary conditions for the bi-mechanism model. Our simulations conducted using an orthogonal collocation on finite element scheme show that the concentration difference of 35 g/L between sea water and fresh water results in the open circuit voltage of 63 mV and the short circuit current density of 11.5 A/m2. These values are close to ones that were obtained from the experiments.
11 citations
05 Jan 2017
TL;DR: In this paper, a reduced two-phase model was introduced to predict the onset of flow reversal in falling films under countercurrent flow, based on spatiotemporal stability and wave topology analysis.
Abstract: A reduced two-phase model suitable for industrial uptake is introduced to predict the onset of flow reversal in falling films under countercurrent flow. Analysis of spatiotemporal stability and wave topology shows that vortex distribution plays a crucial role in the incipience of flow reversal.
11 citations