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 article , an ad hoc design procedure was applied to the single-column batch purification of an industrially relevant PEGylated protein, with the aim of defining optimal collection window, elution duration and elution buffer ionic strength to be then transferred to the multicolumn countercurrent solvent gradient purification (MCSGP), which allowed the internal and automated recycling of product-containing side fractions that are typically discarded in the batch processes.
1 citations
TL;DR: In this paper, mass flow rates and discharge coefficients were calculated in order to characterize and compare the two geometries with a plain hole (square-edged orifice) and the cylindrical insert, which may cause the high-temperature gradients observed under operating conditions.
Abstract: Heavy-duty gas turbine combustion systems have a reverse flow combustion-cooling air network. High-temperature gradients have been observed in some combustion liners around the plain holes, or around the cylindrical inserts welded into the mixing holes. Flow visualization tests were performed in a countercurrent flow facility. Measurements of pressure and velocity distributions in and around the mixing hole jet were taken, and mass flow rates and discharge coefficients were calculated in order to characterize and compare the two geometries. The results with a plain hole (square-edged orifice) and the cylindrical insert show the presence of a sharp separation region at the trailing edge (combustion side) of the liner hole, which may cause the high-temperature gradients observed under operating conditions. The measured discharge coefficients show a dependence on the insert geometry, the flow parameter (K), and the bottom section (combustion side).
1 citations
01 Jan 2003
1 citations
01 Jan 1963
1 citations
Patent•
18 Oct 2019
TL;DR: In this article, the authors proposed a gas-liquid countercurrent heat exchange device with a plurality of liquid channels arranged in the length direction, where the gaps between the adjacent layers are arranged to form the gas flow channels.
Abstract: The utility model relates to the field of heat exchangers. The utility model provides a gas-liquid countercurrent heat exchange device. The device comprises a strip-shaped pore plate, the strip-shapedpore plate is provided with a plurality of liquid channels arranged in the length direction. The liquid channel vertically penetrates through the strip-shaped pore plate, the strip-shaped pore plateis rolled into a multi-layer tube plate structure, adjacent layers are arranged at intervals to form an airflow channel, an air inlet is formed in the lower end of the airflow channel, an air outlet is formed in the upper end of the airflow channel, a liquid inlet is formed in the upper end of the liquid channel, and a liquid outlet is formed in the lower end of the liquid channel. According to the gas-liquid countercurrent heat exchanger, the strip-shaped pore plates with the liquid channels are rolled into a multi-layer tube plate structure, and the gaps between the adjacent layers are arranged to form the gas flow channels, so that liquid flows through the liquid channels from top to bottom, air flows through the gas flow channels from bottom to top, countercurrent heat exchange betweengas and liquid is realized, and the heat exchange efficiency is improved.
1 citations