The condenser in a large steam power plantĪ concentric tube heat exchanger with specified operating conditionsĭownloaded from Digital Engineering Library McGraw-Hill (Copyright © 2004 The McGraw-Hill Companies. Naterer University of Ontario Institute of Technology Oshawa, Ontario, Canada Any use is subject to the Terms of Use as given at the website. Problem 1 A chemical processing technology needs a thinner liquid film coating for better adhesive properties of a new product. The film flows down under gravity along an inclined plate.
Effective thermal control is needed to achieve a specified level of adhesive quality. This goal is accomplished by changing the wall temperature at a certain point along the plate, which affects the thermal boundary layer within the film. Then the growth of the thermal boundary layer can be determined.īefore evaluating heat transfer based on the Nusselt number, the film velocity is needed to predict thermal convection within the film. The spatial profile of temperature remains constant, after the point where the edge of the thermal boundary layer reaches the edge of the film. This point is needed for sizing of the processing equipment. Thus, a thermal analysis is needed to find the film velocity, boundary-layer growth, and Nusselt number for evaluating the temperature within the film. This processing temperature affects the adhesive properties of the film. Consider a liquid film (ethylene glycol at 300 K) during testing of the chemical process.
The film slows steadily down along a flat plate in the x direction.
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