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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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Patent
29 Jun 1978
TL;DR: In this article, the authors propose to carry out adsorption and desorption continuously without valve changing operation by countercurrent contact of granular material such as adsorbing agent which can be regenerated with gas while the agent falls within a catalyst apparatus so as to absorb gas components.
Abstract: PURPOSE:To carry out adsorption and desorption continuously without valve changing operation by countercurrent contact of granular material such as adsorbing agent which can be regenerated with gas while the agent falls within a catalyst apparatus so as to absorb gas components, and after the absorption (adsorption), by countercurrent contact with regenerating gas in regeneration apparatus.

1 citations

01 Jan 2002
TL;DR: In this article, new models for describing hydrodynamics and mass transfer performance in supercritical fluid extraction columns were proposed and proved by experimental data, which were obtained in super critical fluid extraction packed column, spray column, and sieve tray column respectively.
Abstract: New models for describing hydrodynamics and mass transfer performance in supercritical fluid extraction columns were proposed. Those models were proved by experimental data, which were obtained in supercritical fluid extraction packed column, spray column and sieve tray column respectively. The inner diameter of those columns areФ25 mm. These experimental systems include supercritical carbon diox-ide-isopropanol-water and supercritical carbon dioxide-ethanol-water, in which supercritical carbon dioxide was dispersed phase, and another was continuous phase. The extraction processes were operated with continuous countercurrent flow. The predicted values are agreed well with experimental data.

1 citations

Journal ArticleDOI
TL;DR: In this article, the operating window, in terms of liquid and gas superficial velocities, within which countercurrent gas flow occurs at two low-dip angles, has been determined experimentally.
Abstract: Results from experiments conducted in downward liquid-gas flows in inclined, eccentric annular pipes, with water and air as the working fluids, are presented. The gas was injected in the middle of the test section length. The operating window, in terms of liquid and gas superficial velocities, within which countercurrent gas flow occurs at two low-dip angles, has been determined experimentally. The countercurrent flow observed was in the slug regime, while the co-current one was stratified. Countercurrent flow fraction and void fraction measurements were carried out at various liquid superficial velocities and gas injection rates and correlated to visual observations through a full-scale transparent test section. Our results indicate that countercurrent flow can be easily generated at small downward dip angles, within the practical range of liquid superficial velocity for drilling operations. Such flow is also favored by low gas injection rates.

1 citations

Patent
06 Mar 2013
TL;DR: In this article, the core portion of the cocurrent and countercurrent jet compound hyperbolic cooling tower is improved into a cocurrent cooling mode, and abandons a filler, a countercurrent spray device and a common dehydrator, so the cooling form of the tower is optimized, and the drifting ratio of the dehydrator is reduced.
Abstract: The invention relates to a cocurrent and countercurrent jet compound hyperbolic cooling tower. The cooling tower comprises an air duct, a multidimensional dehydrator, a jet water distribution system, a honeycomb-shaped rectifier, an air inlet and a water collection pool, wherein the multidimensional dehydrator is positioned at the middle and lower portion of the air duct; the jet water distribution system is positioned at the lower portion of the tower; volute jet devices are uniformly distributed in the jet water distribution system; a jet water drop and non-saturated air combined cocurrent and countercurrent running space is between the multidimensional dehydrator and the jet water distribution system; the honeycomb-shaped rectifier is arranged under the jet water distribution system; and the water collection pool is positioned at the bottom of the cooling tower, and the air inlet is arranged between a honeycomb-shaped rectifier rack and the water collection pool. The core portion of the cocurrent and countercurrent jet compound hyperbolic cooling tower is improved into a cocurrent and countercurrent cooling mode, and abandons a filler, a countercurrent spray device and a common dehydrator, so the cooling form of the tower is optimized, and the drifting ratio of the dehydrator is reduced; and the cocurrent and countercurrent cooling mode enables the cooling effect to be improved under a same condition, has the advantages of stable cooling effect, low maintenance, energy saving, and environmental protection, and is suitable for large, medium and small hyperbolic cooling towers.

1 citations

Patent
02 Apr 2014
TL;DR: The spiral countercurrent flow heat exchange device is characterized in this article in that the heat exchange tubes are of an inward-protruded rib structure and the two ends of each heat exchange tube are located on perforated plates in the shell respectively.
Abstract: The utility model relates to a spiral countercurrent flow heat exchange device provided with heat exchange tubes with inward-protruded ribs. The spiral countercurrent flow heat exchange device aims to solve the problem of heat exchange tubes in the prior art are low in heat exchange coefficient. The spiral countercurrent flow heat exchange device comprises a precooler shell, the heat exchange tubes arranged in the shell, and air inlet-outlets located at two ends of the shell. The two ends of each heat exchange tube are located on perforated plates in the shell respectively, and a spiral baffle plate is arranged between the two perforated plates. The spiral countercurrent flow heat exchange device is characterized in that the heat exchange tubes are of an inward-protruded rib structure. The spiral countercurrent flow heat exchange device reduces heat resistance, improves the condensation heat transfer coefficient, reduces the thickness of the boundary retention bottom layers of compressed air, enhances the heat transfer effect of one-phase fluid in the tubes, and enhances the structural strength of the heat exchange tubes.

1 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202358
2022115
202127
202041
201947
201849