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.

Catalytic reactor employing moving belt of catalyst - with or without external heat exchange, for reaction of gaseous cpds.

Abstract: The reactor includes a continuous metal belt driven by motor. the belt comprises a series of boxes, each of which has its two largest sides made of metal mesh and is filled with catalyst pellets. Gases are directed through the boxes and then recovered. Heat exchange, to maintain the reaction temp. constant, takes place between the belt and a heat exchange fluid at a part of the belt distinct from that traversed by the gas. Pref. the heat exchange fluid consists of the gas which has been removed from the reactor and returned to the belt in countercurrent after passage through a heat exchanger. The boxes may contain metallic heat exchange bodies. Reactor heat exchange system is simplified. Catalyst can be regenerated without shutdown.

Use of a wetted‐wall column for the examination of a reacting gas‐liquid system in a packing

Abstract: A wetted-wall column is used to determine the values of HOL and KLa for the flow of a viscous cuprous ammonium lactate solution countercurrent to a H2/CO gas mixture. Kapitsa's equation is used to calculate the value of the interfacial area on the rippled liquid surface. Values of KL are calculated and the effects of liquid and gas flow on KL are determined. It is shown that there is a significant effect of gas flow even though the absorption is liquid film controlled. With a viscous solution the wetted-wall column can simulate conditions in a packing. The results from the wetted-wall and packed towers are examined by a new method to obtain the degree of wetting of the packing while mass transfer is occurring.

Modeling of Gravity-Driven Oscillatory Countercurrent Two-Phase Channel Flows

Abstract: Gravity-driven countercurrent two-phase flow, in channels connected to a sealed tank at one end and open to the atmosphere at the other end, was analytically studied. This type of gravity-driven co...

Modeling the Enhancement Effect of Countercurrent on Acceleration Perception in Galvanic Vestibular Stimulation

Abstract: Galvanic vestibular stimulation induces virtual acceleration sensation and is expected to be applied in computer games to improve their reality. The acceleration sensation can be enhanced by giving countercurrent which consists of an opposite current part and a forwarding current part. Conventionally, however, the degree of the enhancement is uncontrollable. This study reports that the effect of countercurrent can be modeled by an electrical circuit containing a capacitor and resistors. To model the effect of the countercurrent on the acceleration perception, we investigated the relation between the parameters: the duration and the strength of the opposite current part, of the countercurrent and strength of acceleration perception. The results of our study show that the strength of the acceleration sensation induced by the countercurrent stimulation has a nonlinear correlation with the duration of the opposite current, and the characteristics of the enhancement effect can be estimated using a CR circuit model.