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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
08 Apr 1968
TL;DR: In this article, a continuuous cyclic process for the contact of a contaminator with a solider in a column-loop is described. But it does not specify whether the solider is used to transfer or load the contaminant onto the soliders.
Abstract: A CONTINUOUS CYCLIC PROCESS FOR COUNTERCURRENT CONTACT OF A CONTAMINANT CONTAINING LIQUID WITH A SOLID IN A COLUMN LOOP WHICH INCLUDES INTRODUCING THE CONTAMINANT CONTAINING LIQUID INTO THE UPPER PORTION OF ONE SECTION OF THE COLUMN LOOP FOR DOWNWARD FLOW THROUGH THE SOLIDS BED THEREIN TO TRANSFER OR LOAD THE CONTAMINANT ONTO THE SOLIDS. THE SECTION IS POSITIONED ADJACENT THE UPPER END OF THE COLUMN LOOP. LIQUID WITH A REDUCED AMOUNT OF CONTAMINANT IS WITHDRAWN FROM THE LOWER PORTION OF THIS SECTION. A REGENERATING AGENT IS FED TO THE LOWER PORTION OF ANOTHER SECTION OF THE COLUMN LOOP FOR FLOW THROUGH A BED OF SOLIDS LOADED WITH THE CONTAMINANT. THE FLOW OF LIQUID AND REGENERATING AGENT ARE INTERRUPTED AND THE SOLIDS BED IS SHIFTED AROUND THE LOOP AND THE LOADING AND REGENERATING CYCLES ARE THEN REPEATED.

8 citations

Journal ArticleDOI
01 Aug 1993
TL;DR: In this article, a mixed lumped-differential formulation is employed to model the transient energy equations for fully developed laminar-laminar or laminor-turbulent flow situations in concurrent or countercurrent double-pipe heat exchangers.
Abstract: A mixed lumped-differential formulation is employed to model the transient energy equations for fully developed laminar-laminar or laminar-turbulent flow situations in concurrent or countercurrent double-pipe heat exchangers. The temperature distribution in the outer annular channel is radially lumped, providing a more general boundary condition for the inner channel differential energy equation, coupled through the interface condition. The case of periodically varying inlet temperatures is more closely considered, and the dynamic response of the exchanger is established in terms of the governing dimensionless parameters, such as heat capacity flow rate ratio, dimensionless inlet temperature oscillation frequency, and relative wall thermal resistence. The ideas in the generalized integral transform technique are extended to yield analytical solutions to the related periodic problem defined in the complex domain, and offer highly accurate numerical results for quantities of practical interest, such as fluids bulk temperatures.

8 citations

Patent
15 Apr 1982
TL;DR: In this article, the authors present a process for the separation of a gas mixture at superatmospheric pressure by partial condensation at cryogenic temperatures, where the separated condensate and uncondensed vapor are passed back as returning streams in indirect countercurrent heat exchange relationship with the incoming feed mixture.
Abstract: In a process for the separation of a gas mixture at superatmospheric pressure by partial condensation at cryogenic temperatures and wherein the separated condensate and uncondensed vapor are passed back as returning streams in indirect countercurrent heat exchange relationship with the incoming feed mixture, the power required for providing the refrigeration and energy requirements for the separation are reduced by supplying said requirements by means of a heat pump alone or together with at least one separate refrigeration cycle and/or some Joule-Thomson expansion of the condensate, and in the heat pump a compressed multi-component gaseous medium is condensed by heat exchange with said returning streams over a first temperature range and then expanded by Joule-Thomson expansion, and the expanded condensate is evaporated by heat exchange with the feed gas mixture over a lower temperature range than said first temperature range, and recycled for recompression.

8 citations

Journal ArticleDOI
TL;DR: An experimental study of flooding in countercurrent air-water annular flow in a large diameter vertical tube using wall pressure measurements is described in this paper, where Axial pressure profiles along the length of the test section were measured up to and after flooding using fast response pressure transducers for three representative liquid flow rates representing a wide range of liquid Reynolds numbers.

8 citations

Journal ArticleDOI
TL;DR: In this article, a theoretical model has been used to predict the thermal efficiency of a countercurrent, gas-solid, packed heat exchanger, in conjunction with pressure drop and solid holdup data, and the results show that the model correctly gives the efficiency versus gas velocity curve for different packing heights and solids mass fluxes.
Abstract: A theoretical model has been used, in conjunction with pressure drop and solid holdup data, to predict correctly the thermal efficiency of a countercurrent, gas-solid, packed heat exchanger. In the model, the ideal efficiency is multiplied by a ratio of particles in contact with the gas to the total amount of particles in the packed section. The Erugun equation is used to obtain both the effective packing porosity and the number of particles in contact with the gas. The results show that the model correctly gives the efficiency versus gas velocity curve for different packing heights and solids mass fluxes. The calculated and experimental velocities for which exchanger efficiency is a maximum are also in agreement.

8 citations


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