Full metadata record
| DC Field | Value | Language |
|---|---|---|
| dc.contributor | Multi-disciplinary Studies | en_US |
| dc.contributor | Department of Mechanical Engineering | en_US |
| dc.creator | Lo, Ching-yuen Alex | - |
| dc.identifier.uri | https://theses.lib.polyu.edu.hk/handle/200/459 | - |
| dc.language | English | en_US |
| dc.publisher | Hong Kong Polytechnic University | - |
| dc.rights | All rights reserved | en_US |
| dc.title | Effects of surface roughness on forced convection and friction in an air-cooled equilateral triangular duct | en_US |
| dcterms.abstract | This dissertation describes the investigation results of the effect of different surface finishes of an air-cooled equilateral triangular duct at steady state. Experimental investigations had been conducted to study the forced convective heat transfer and pressure drop characteristic of fully-developed turbulent flow in horizontal equilateral triangular ducts which were geometrically identical and with the same hydraulic diameter, but having different surface roughness of 1.2um, 2.0um, 3.0um, 7.5um and 11.5um. In order to achieve fully-developed turbulent flow condition when performing the experiments, hydraulic diameter should be determined by Reynolds number ranging from 7000 to 20000. The entire inner duct walls were heated uniformly, while the outer surfaces were thermally insulated. It was found that the variation of Stanton number (St) with friction coefficient (f) can be expressed by the relationship of St = C*f, where the constant (C) increases from 0.41 to 0.50 when the surface roughness is increased from of 1.2um to 11.5um. It was also concluded that the duct with higher surface roughness tends to have a better heat transfer performance. Non-dimensional expressions for the determination of the heat transfer coefficient and friction factor of the equilateral triangular ducts with different surface roughness were also developed. | en_US |
| dcterms.extent | ix, 96 leaves : ill. (some col.) ; 30 cm | en_US |
| dcterms.isPartOf | PolyU Electronic Theses | en_US |
| dcterms.issued | 1999 | en_US |
| dcterms.educationalLevel | All Master | en_US |
| dcterms.educationalLevel | M.Sc. | en_US |
| dcterms.LCSH | Heat exchangers | en_US |
| dcterms.LCSH | Heat -- Transmission | en_US |
| dcterms.LCSH | Surfaces (Technology) | en_US |
| dcterms.LCSH | Hong Kong Polytechnic University -- Dissertations | en_US |
| dcterms.accessRights | restricted access | en_US |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| b14792400.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 4.69 MB | Adobe PDF | View/Open |
Copyright Undertaking
As a bona fide Library user, I declare that:
- I will abide by the rules and legal ordinances governing copyright regarding the use of the Database.
- I will use the Database for the purpose of my research or private study only and not for circulation or further reproduction or any other purpose.
- I agree to indemnify and hold the University harmless from and against any loss, damage, cost, liability or expenses arising from copyright infringement or unauthorized usage.
By downloading any item(s) listed above, you acknowledge that you have read and understood the copyright undertaking as stated above, and agree to be bound by all of its terms.
Please use this identifier to cite or link to this item:
https://theses.lib.polyu.edu.hk/handle/200/459