Please use this identifier to cite or link to this item:
https://hdl.handle.net/10356/5471
Full metadata record
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Yeo, Keng Hoo | en |
dc.date.accessioned | 2008-09-17T10:51:20Z | en |
dc.date.available | 2008-09-17T10:51:20Z | en |
dc.date.copyright | 2005 | en |
dc.date.issued | 2005 | en |
dc.identifier.citation | Yeo, K. H. (2005). Heat transfer enhancement in drag-reducing channel flow. Master’s thesis, Nanyang Technological University, Singapore. | en |
dc.identifier.uri | https://hdl.handle.net/10356/5471 | en |
dc.description.abstract | Since the discovery of the Toms effect (Toms, 1948), polymers as drag-reducing additives have been widely used to reduce the undesired drag that occurs over long-distance transportation of liquids. However, less attention has been focused on this area of research, especially in the case of re-circulating flow systems. This is mainly due to the fact that the polymer additive’s capability as a drag reducer can be permanently crippled when subjected to high shear rates or exposed to prolonged period of turbulent flow and repeated heating and cooling. In contrast to the polymer additives, mechanical degradation of surfactant additives when exposed to regions of high shear stress or repeated heating and cooling is only temporary. In the present study, a two-dimensional water tunnel was designed and fabricated to investigate drag reduction by surfactant additives. Flow development check experiments were performed with different concentrations of surfactant additives to justify the fully developed flow conditions at the test section. The results indicate that the hydrodynamic entry length for water flow without surfactants is very short. For surfactant concentrations of 20, 60, 120 and 160 ppm, the entry lengths were about 300, 500, 1200 and 1400 mm respectively. The entry length for the surfactant concentration of 200 ppm was consistent with that of 160 ppm. | en |
dc.rights | Nanyang Technological University | en |
dc.subject | DRNTU::Engineering::Mechanical engineering | en |
dc.title | Heat transfer enhancement in drag-reducing channel flow | en |
dc.type | Thesis | en |
dc.contributor.supervisor | Leong Kai Choong | en |
dc.contributor.supervisor | Zhou Tongming | en |
dc.contributor.school | School of Mechanical and Aerospace Engineering | en |
dc.description.degree | MASTER OF ENGINEERING (MPE) | en |
dc.identifier.doi | 10.32657/10356/5471 | en |
item.fulltext | With Fulltext | - |
item.grantfulltext | open | - |
Appears in Collections: | MAE Theses |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
MAE-THESES_1203.pdf | 6.52 MB | Adobe PDF | View/Open |
Page view(s) 20
654
Updated on Mar 26, 2024
Download(s) 10
421
Updated on Mar 26, 2024
Google ScholarTM
Check
Altmetric
Items in DR-NTU are protected by copyright, with all rights reserved, unless otherwise indicated.