Heat transfer between a laminar free impinging jet and a heated plate.
Item
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Title
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Heat transfer between a laminar free impinging jet and a heated plate.
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Identifier
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AAI9000740
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identifier
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9000740
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Creator
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Wang, Xiaosong.
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Contributor
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Advisers: Zeev Dagan | Latif M. Jiji
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Date
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1989
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Language
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English
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Publisher
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City University of New York.
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Subject
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Engineering, Mechanical
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Abstract
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The analytical solution to the conjugate heat transfer problem associated with laminar liquid jet impingement is presented in this dissertation.;In the stagnation region, both the exact energy equation and the boundary layer energy equation are solved asymptotically. The results show that the non-uniformity of wall temperature or wall heat flux has a considerable effect on the stagnation point Nusselt number. Increasing the wall temperature or wall heat flux with the radial distance r reduces the stagnation point Nusselt number while decreasing the wall temperature or wall heat flux with r enhances the heat transfer at the stagnation point.;In the boundary layer region, the analysis begins with obtaining the solution to the problem with a step change in wall temperature or wall heat flux. The solution corresponding to the problem with arbitrary wall temperature is then obtained by the superposition method. The result is matched with that for the stagnation region graphically so that the Nusselt number distribution throughout the stagnation region and the boundary layer region is obtained.;For the conjugate problem in which an arbitrary temperature or heat flux is prescribed at the non-impingement surface, the general solutions for the fluid and solid phases are matched by requiring the continuity of the temperature and heat flux at the impingement surface. The local Nusselt number is found to depend upon the Prandtl number, Pr, of the fluid, the ratio of the fluid conductivity to the solid conductivity, k, the aspect ratio of the thickness to the radius of the plate, {dollar}\epsilon{dollar}, and the prescribed temperature or heat flux distribution. For a thick plate, e.g. {dollar}\epsilon{dollar} = 1, the prescribed temperature or heat flux has little effect on the local heat transfer coefficient. For a thin plate, however, the effect is considerable. Outside the stagnation region, increasing the prescribed temperature or heat flux with the radial distance r enhances the local heat transfer coefficient while decreasing the prescribed temperature or heat flux with r reduces it. The results also indicate that the local heat transfer coefficient becomes higher when k is larger. (Abstract shortened with permission of author.).
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
