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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Patent•
19 Nov 2014
TL;DR: In this article, a hot countercurrent proof solar circulating pump station is proposed to solve the problem that heat stored in the heat exchanging water tank due to the natural thermo-syphon principle are lost due to natural pipeline circulation in the prior art.
Abstract: The utility model discloses a hot countercurrent proof solar circulating pump station and relates to the heating supply system field. The hot countercurrent proof solar circulating pump station comprises a solar thermal collector, a heat exchanging water tank, a pump circulating assembly and a bending pipe, wherein the bending pipe which connects an upper opening of the heat exchanging water tank and a water return pipe of the solar thermal collector comprises two or more than two bends. The hot countercurrent proof solar circulating pump station has the advantages of effectively solving the problem that heat stored in the heat exchanging water tank due to the natural thermo-syphon principle are lost due to natural pipeline circulation in the prior art and effectively solving the hot countercurrent problem due to the facts that the bending pipe with two or more than two bends is arranged and accordingly the heat cannot pass through the bending pipe forcefully under the natural environment due to the principle that the heat is upward after a water pump stops working.
1 citations
TL;DR: In this paper, a sedimentation-convection model for solid behavior in slurry bubble columns is presented and the analytical solution for axial solid concentration for monodispersed particles in a bubble column at steady state for the continuous flow of slurry and gas is derived.
Abstract: The use of a diffusive-type model to represent the behaviour of solid particles in a slurry bubble column has been questioned. In agreement with the observation of Levenspiel and Fitzgerald, a sedimentation-convection model for solid behaviour in slurry bubble columns is presented. With this model, the analytical solution for axial solid concentration for monodispersed particles in a slurry bubble column at steady state for the continuous flow of slurry and gas is derived to be: C s = U 1 C s f /( U 1 ± V p ). The use of the model together with the correlations of Ramachandran and Chaudhari for particle settling velocity in slurry bubble columns has been found to well predict the solid hold-up in the monodispersed solid systems of Bhaga and Weber and also in the polydispersed solid systems operated in both cocurrent and countercurrent mode.
1 citations
Patent•
18 Mar 2010
TL;DR: In this paper, a two-liquid countercurrent extraction apparatus capable of efficiently and smoothly performing the extraction operation even when a material to be extracted and/or an extraction solvent contain solid particles was proposed.
Abstract: PROBLEM TO BE SOLVED: To provide a two-liquid countercurrent extraction apparatus capable of efficiently and smoothly performing the extraction operation even when a material to be extracted and/or an extraction solvent contain solid particles. SOLUTION: A spiral baffle plate is disposed in an extraction vessel, a central axis of the baffle plate is coincide with an axis of the extraction vessel, and the baffle plate is fixed not to rotate. COPYRIGHT: (C)2010,JPO&INPIT
1 citations
Patent•
09 Jan 2018
TL;DR: In this article, a heat exchange method of a fair current and countercurrent mode adjustable high-efficiency heat exchange system was presented. But the authors did not consider the effect of the fair current on the performance of the system.
Abstract: The invention discloses a heat exchange method of a fair current and countercurrent mode adjustable high-efficiency heat exchange system. The heat exchange method comprises the steps of established power, system flow and flow rate, detection of temperature, calculation of inlet temperature difference of cold fluid and hot fluid, small heat requirement of the system, fair current flowing, large heat requirement of the system, countercurrent flowing, moderate heat requirement of the system, and countercurrent flowing. The fair current flowing mode is adopted under the condition of the small heatrequirement of the system, so that the system resistance is small, the unnecessary energy consumption is reduced, and the system operates safely and stably. The countercurrent flowing mode is adopted under the condition of the large heat requirement of the system, so that the average temperature difference is large, the heat exchange efficiency of a heat exchanger is improved, and the heat requirement of the system is satisfied. The fair current and the countercurrent alternate according to the heat exchange method, thereby preventing high temperature from centralizing at one end of the heatexchanger and prolonging the service life of the heat exchanger. According to the change of practical situations, the flowing direction of heat exchanger fluid is flexibly changed; and the heat exchange method gives full play to the respective advantages of the fair current and the countercurrent and has an obvious energy saving effect and very good economic benefits and social benefits.
1 citations
TL;DR: The approaches of Klinkenberg and Rony offer a route to a complete analytical solution of the problem of multistage countercurrent separation systems, but some revisions of their equations are required to express the true maximal separative power as discussed by the authors.
Abstract: The approaches of Klinkenberg and Rony offer a route to a complete analytical solution of the problem of multistage countercurrent separation systems, but some revisions of their equations are required to express the true maximal separative power of multistage systems.
1 citations