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 theoretical predictions of pure water productivity in a parallel-plate direct contact membrane distillation (DCMD) module using roughened-surface flow channel for enhancing heat transfer enhancement were obtained under countercurrent-flow operations.
25 citations
TL;DR: A continuous-flow countercurrent three-stage adsorption process was developed to provide for design in practical application and it was proved that large adsorbent savings were obtained from operations of these systems in most cases.
25 citations
TL;DR: In this article, a droplet detachment model is proposed to derive the effective water saturation in a thin boundary layer at the matrix-fracture interface, which is a function of fluid properties, fluid velocity in the fracture and fracture width.
Abstract: Although a lot of research has been done in modeling the oil recovery from fractured reservoirs by countercurrent imbibition, less attention has been paid to the effect of the fracture fluid velocity upon the rate of oil recovery. Experiments are conducted to determine the effect of fracture flow rate upon countercurrent imbibition. A droplet detachment model is proposed to derive the effective water saturation in a thin boundary layer at the matrix–fracture interface. This effective boundary water saturation is a function of fluid properties, fluid velocity in the fracture and fracture width. For a highly water–wet porous medium, this model predicts an increase in the boundary water saturation with increase in fracture fluid velocity. The increase in boundary water saturation, in turn, increases the oil recovery rate from the matrix, which is consistent with the experimental results. The model also predicts that the oil recovery rate does not vary linearly with the boundary water saturation.
25 citations
TL;DR: In this paper, a criterion for flooding in the countercurrent flow of two fluids in horizontal tubes and channels is developed, which exhibits a dependence upon the density ratio of the fluids beyond that present in the criterion of Wallis (1969).
25 citations
TL;DR: In this paper, the velocity and length of single Taylor bubbles were determined by differential pressure measurements in an 80 ft long inclined pipe with 6 in. inner diameter, and a new drift velocity correlation that incorporates inclination angle and apparent viscosity was developed, which is applicable for non-Newtonian fluids with the Eotvos numbers (E0) ranging from 3212 to 3405 and apparent viscous properties ranging from 0.001 Pa√s to 129 Pa∙s.
Abstract: An experimental investigation of single Taylor bubbles rising in stagnant and downward flowing non-Newtonian fluids was carried out in an 80 ft long inclined pipe (4°, 15°, 30°, 45° from vertical) of 6 in. inner diameter. Water and four concentrations of bentonite–water mixtures were applied as the liquid phase, with Reynolds numbers in the range 118 < Re < 105,227 in countercurrent flow conditions. The velocity and length of Taylor bubbles were determined by differential pressure measurements. The experimental results indicate that for all fluids tested, the bubble velocity increases as the inclination angle increases, and decreases as liquid viscosity increases. The length of Taylor bubbles decreases as the downward flow liquid velocity and viscosity increase. The bubble velocity was found to be independent of the bubble length. A new drift velocity correlation that incorporates inclination angle and apparent viscosity was developed, which is applicable for non-Newtonian fluids with the Eotvos numbers (E0) ranging from 3212 to 3405 and apparent viscosity (μapp) ranging from 0.001 Pa∙s to 129 Pa∙s. The proposed correlation exhibits good performance for predicting drift velocity from both the present study (mean absolute relative difference is 0.0702) and a database of previous investigator’s results (mean absolute relative difference is 0.09614).
25 citations