Matches in DBpedia 2014 for { <http://dbpedia.org/resource/Countercurrent_exchange> ?p ?o. }
Showing items 1 to 33 of
33
with 100 items per page.
- Countercurrent_exchange abstract "Countercurrent exchange is a mechanism occurring in nature and mimicked in industry and engineering, in which there is a crossover of some property, usually heat or some component, between two flowing bodies flowing in opposite directions to each other. The flowing bodies can be liquids, gases, or even solid powders, or any combination of those. For example, in a distillation column, the vapors bubble up through the downward flowing liquid while exchanging both heat and mass.The maximum amount of heat or mass transfer that can be obtained is higher with countercurrent than co-current (parallel) exchange because countercurrent maintains a slowly declining difference or gradient (usually temperature or concentration difference). In concurrent exchange the initial gradient is higher but falls off quickly, leading to wasted potential. For example, in the diagram at the right, the fluid being heated (exiting top) has a higher exiting temperature than the cooled fluid (exiting bottom) that was used for heating. With cocurrent or parallel exchange the heated and cooled fluids can only approach one another. The result is that countercurrent exchange can achieve a greater amount of heat or mass transfer than parallel under otherwise similar conditions. See: flow arrangement.Countercurrent exchange when set up in a circuit or loop can be used for building up concentrations, heat, or other properties of flowing liquids. Specifically when set up in a loop with a buffering liquid between the incoming and outgoing fluid running in a circuit, and with active transport pumps on the outgoing fluid's tubes, the system is called a Countercurrent multiplier, enabling a multiplied effect of many small pumps to gradually build up a large concentration in the buffer liquid.Other countercurrent exchange circuits where the incoming and outgoing fluids touch each other are used for retaining a high concentration of a dissolved substance or for retaining heat, or for allowing the external buildup of the heat or concentration at one point in the system.Countercurrent exchange circuits or loops are found extensively in nature, specifically in biologic systems. In vertebrates, they are called a Rete mirabile, originally the name of an organ in fish gills for absorbing oxygen from the water. It is mimicked in industrial systems. Countercurrent exchange is a key concept in chemical engineering thermodynamics and manufacturing processes, for example in extracting sucrose from sugar beet roots.Countercurrent multiplication is a similar but different concept where liquid moves in a loop followed by a long length of movement in opposite directions with an intermediate zone. The tube leading to the loop passively building up a gradient of heat (or cooling) or solvent concentration while the returning tube has a constant small pumping action all along it, so that a gradual intensification of the heat or concentration is created towards the loop. Countercurrent multiplication has been found in the kidneys as well as in many other biological organs.".
- Countercurrent_exchange thumbnail Countercurrent_exchange.png?width=300.
- Countercurrent_exchange wikiPageExternalLink 447.full.pdf.
- Countercurrent_exchange wikiPageExternalLink countercurrent_ct.swf.
- Countercurrent_exchange wikiPageExternalLink www.diffusaire.com.
- Countercurrent_exchange wikiPageExternalLink patents?id=O5ktAAAAEBAJ&printsec=frontcover&dq=Mask+with+removable+countercurrent+exchange+module&hl=en&ei=48oUTvzVLMTRhAe9n9HGDQ&sa=X&oi=book_result&ct=result&resnum=1&ved=0CCgQ6AEwAA.
- Countercurrent_exchange wikiPageID "171317".
- Countercurrent_exchange wikiPageRevisionID "606633230".
- Countercurrent_exchange hasPhotoCollection Countercurrent_exchange.
- Countercurrent_exchange subject Category:Animal_anatomy.
- Countercurrent_exchange subject Category:Chemical_process_engineering.
- Countercurrent_exchange subject Category:Heat_transfer.
- Countercurrent_exchange subject Category:Production_and_manufacturing.
- Countercurrent_exchange subject Category:Renal_physiology.
- Countercurrent_exchange comment "Countercurrent exchange is a mechanism occurring in nature and mimicked in industry and engineering, in which there is a crossover of some property, usually heat or some component, between two flowing bodies flowing in opposite directions to each other. The flowing bodies can be liquids, gases, or even solid powders, or any combination of those.".
- Countercurrent_exchange label "Countercurrent exchange".
- Countercurrent_exchange label "Gegenstromprinzip (Verfahrenstechnik)".
- Countercurrent_exchange label "Intercambio por contracorriente".
- Countercurrent_exchange label "Scambio in controcorrente".
- Countercurrent_exchange label "Tegenstroomprincipe".
- Countercurrent_exchange label "Troca em contracorrente".
- Countercurrent_exchange label "Рекуперативный противоточный теплообменник".
- Countercurrent_exchange sameAs Gegenstromprinzip_(Verfahrenstechnik).
- Countercurrent_exchange sameAs Intercambio_por_contracorriente.
- Countercurrent_exchange sameAs Scambio_in_controcorrente.
- Countercurrent_exchange sameAs Tegenstroomprincipe.
- Countercurrent_exchange sameAs Troca_em_contracorrente.
- Countercurrent_exchange sameAs m.016_yl.
- Countercurrent_exchange sameAs Q937912.
- Countercurrent_exchange sameAs Q937912.
- Countercurrent_exchange wasDerivedFrom Countercurrent_exchange?oldid=606633230.
- Countercurrent_exchange depiction Countercurrent_exchange.png.
- Countercurrent_exchange isPrimaryTopicOf Countercurrent_exchange.
