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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03 Dec 1992TL;DR: In this paper, the fibers are heat treated using steam as the heat treatment gas in a device that provides for a rapid, cocurrent, countercurrent or both cocurrent and countercurrent flow of steam.
Abstract: This invention aims at improvement of heat-treatment technology for manufacture of large amounts of polybenzazole fibers. The fibers are heat treated using steam as the heat treatment gas in a device that provides for a rapid, cocurrent, countercurrent or both cocurrent and countercurrent flow of steam.
9 citations
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TL;DR: In this paper, a three-phase countercurrent magnetically stabilized bed (MSB) using amorphous alloy SRNA-4 as the solid phase was characterized and mass transfer coefficients (Ks) were characterized.
9 citations
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TL;DR: In this article, the basic principles of packed-column design and defines the limits of countercurrent contacting when applied to situations in which the resistance to mass transfer in the gas phase is important.
9 citations
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TL;DR: In this article, a numerical study of the thermo-hydraulic characteristics of a concentric mini-tube heat exchanger with V-shaped corrugations was conducted.
9 citations
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TL;DR: The design of a membrane countercurrent exchange (CCE) device coupled with a conventional direct insertion membrane probe to measure partial pressure of low solubility inert gases in aqueous samples is presented.
Abstract: Membrane introduction mass spectrometry has been applied to inert gas measurements in blood and tissue, but gases with low blood solubility are associated with reduced sensitivity. Countercurrent extraction of inert gases from a blood sample into a water carrier phase has the potential to extract most of the gas sample while avoiding dependence of signal on blood solubility. We present the design of a membrane countercurrent exchange (CCE) device coupled with a conventional direct insertion membrane probe to measure partial pressure of low solubility inert gases in aqueous samples. A mathematical model of steady-state membrane CCE predicts that countercurrent extraction with appropriate selection of carrier and sample flow rates can provide a mass spectrometer signal nearly independent of variations in solubility over a specified range, while retaining a linear response to changes in gas partial pressure over several orders of magnitude. Experimental data are presented for sulfur hexafluoride and krypton in water samples. Optimal performance is dependent on adequate equilibration between the sample and carrier streams, and the large resistance to diffusion in the aqueous phase for insoluble gases presents a substantial challenge to the application of this principle.
9 citations