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- W2117586111 abstract "Investigations using three experimental scraped surface falling film vertical heat exchanger tubes (6 in., 12 in. and 24 in. by 1 in. D.) have been made. Water and water-glycerol mixtures have been heated in the tubes by passing them down the heated inside surface which was continuously scraped by rotating blades. Flowrates between 306 lb/hr.ft. and 1070 lb/hr.ft. were used, the rate of rotation was varied from 370 to 1600 rpm whilst the number of blades on the shaft was varied between 1 and 4. As a result of these experiments the following equation accurate within ± 20% is proposed for correlating the heat transfer coefficient in the range of the variables studied: Visual observations of the flow of the liquid down the tube indicate that the liquid is held as a continuous fillet in front of each blade. This fact is used in the Appendix* for the alternative suggestion for the characteristic dimension in the correlation. Les recherches exécutées à l'aide de trois tubes échangeurs de chaleur (6 po, 12 po, et 24 po.-1 po. diam.) munis de racleurs rotatifs dans lesquels des films d'eau et de solutions aqueuses de glycérine ont été chauffés, sont présentées. Le film à l'intérieur des tubes est en écoulement vertical descendant et est continuellement raclé par des pales rotatives. La vitesse de rotation a été variée de 370 à 1600 rpm pour des débits entre 306 lb/hr. x pi. et 1070 lb/hr. x pi., en utilisant de 1 à 4 pales sur le racleur. A l'aide des résultats obtenus on a déterminé la relation suivante qui est valide à ± 20% dans la région des variables étudiées: L'observation visuelle démontre qu'un filet liquide continu est maintenu en amont de chaque pale du racleur. Cette autre dimension caractéristique est proposée pour inclusion dans la relation ci-haut." @default.
- W2117586111 created "2016-06-24" @default.
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- W2117586111 date "1963-10-01" @default.
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- W2117586111 title "Heat transfer across a scraped surface" @default.
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- W2117586111 doi "https://doi.org/10.1002/cjce.5450410506" @default.
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