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 |
|