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Impingement Heat Transfer Due to Circular Air Jet Over Rough Flat Surfaces

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dc.contributor.advisor Ahmed, Prof. Dr. Naseem
dc.contributor.author Islam, Md. Nurul
dc.date.accessioned 2018-08-30T09:58:13Z
dc.date.available 2018-08-30T09:58:13Z
dc.date.copyright 2000
dc.date.issued 2000-08
dc.identifier.other ID 0000000
dc.identifier.uri http://hdl.handle.net/20.500.12228/443
dc.description This thesis is submitted to the Department of Mechanical Engineering, Bangladesh Institute of Technology, Khulna in partial fulfillment of the requirements for the degree of Master of Science in Mechanical Engineering, August 2000. en_US
dc.description Cataloged from PDF Version of Thesis.
dc.description Includes bibliographical references (pages 78-81).
dc.description.abstract An experimental investigation was carried out to investigate the pressure distribution and the local and average Nusselt number due to impinging of a circular air jet over uniformly heated rough flat surfaces. The present investigation shows the dependence of the pressure on jet exit Reynolds number, relative roughness of the surfaces and nozzle-to-surface spacings. It was observed that the overall pressure coefficient, cp increases with the increase of jet exit Reynolds number and decreases with the increase of surface roughness and nozzle-to-surface spacings. It also observed that the coefficient pressure at the stagnation point remains constant for the lower values of surface roughness but increases beyond a specific value of surface roughness. In this investigation the nature of dependence of heat transfer on various parameters namely, jet exit Reynolds number, relative roughness of the surface and nozzle-to-surface spacings are identified Jet exit Reynolds numbers of 6000. 8700. 16520 and 23400 , relative surface roughness of smooth. 0.01306, 0.01338, 0.01806. and 0.01952 and dimensionless nozzle-to-surface spacings of 1.61. 2.41, 3.22. and 4.03 are considered for the investigation. It was observed that the local Nusselt number increases with the increase of jet exit Reynolds number and surface roughness, but decreases with the increase of nozzle-to-surface spacings. It also observed that the stagnation point Nusselt number remains constant for the lower values of surface roughness but increases beyond a specific value of surface roughness, which predicts that there is a critical value of surface roughness. The average Nusselt number was calculated and a correlation developed in terms of jet Reynolds number, relative roughness of the surface and nozzle-to-surface spacings. The correlation yields ±10% accurately in context with experimental findings, however shows singularity for smooth surface. Experimental results provided useflul intbrmatiofl which have significant of potential industrial applications regarding the radius of the heat transfer area, nozzle-to-surface spacing atid surface roughness for maximizing the average Nusselt number. en_US
dc.description.statementofresponsibility Md. Nurul Islam
dc.format.extent 81 pages
dc.language.iso en_US en_US
dc.publisher Bangladesh Institute of Technology (BIT), Khulna en_US
dc.rights Khulna University of Engineering & Technology (KUET) thesis/ dissertation/internship reports are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission.
dc.subject Rough Flat Surfaces en_US
dc.subject Heat Transfer en_US
dc.title Impingement Heat Transfer Due to Circular Air Jet Over Rough Flat Surfaces en_US
dc.type Thesis en_US
dc.description.degree Master of Science in Mechanical Engineering
dc.contributor.department Department of Mechanical Engineering


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