Please use this identifier to cite or link to this item:
DC FieldValue
dc.titleExperimental studies on hydrodynamic resistance and flow pattern of a narrow flow channel with dimples on the wall
dc.contributor.authorZhao, J.B.
dc.contributor.authorChew, Y.T.
dc.contributor.authorKhoo, B.C.
dc.identifier.citationZhao, J.B.,Chew, Y.T.,Khoo, B.C. (2004). Experimental studies on hydrodynamic resistance and flow pattern of a narrow flow channel with dimples on the wall. American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED 260 : 475-483. ScholarBank@NUS Repository. <a href="" target="_blank"></a>
dc.description.abstractA systematic flow visualization study on flow structures inside dimples with different relative depths (h/d) and with round or sharp edges is carried out in the first part of this investigation; three flat test plates are made and each one has two dimples with the same print diameter (d) at 40 mm and the same h/d, which is set at 4%, 20% and 50% respectively. Then friction factor is measured on a test channel with two types of test plates. One has dimples array with h/d at 4% and round edge and the second is a flat plate used as reference; surface roughness can be changed for both test plates by painting and covering with water-proof paper. Flow visualization is also done on a dimple located at the center of the plate in the channel. Results show that shallow dimple (h/d=4%) produces non-separated flows at Reynolds number Re δ1500. Dimple with h/d at 20% produces two symmetric vortices at Reδ1700. Round edged dimple changes its fl pattern at different Reynolds number comparing to its sharp edged counterpart. For the dimple with h/d at 50%, at Reδ 1800, it is unstable with its rotating direction changing frequently. In this part of preliminary work, dimpled plate with roughness reduces the friction factor by at least 2% in the flow channel comparing to the reference plate at Reynolds number Re Dh≈8,500-24,000. The friction factor curve of the channel with roughened dimpled plate approaches a hydraulically smooth channel with the increase of Reynolds number. No increase in friction factor is observed on the channel with dimpled plate having smooth surface in the comparison to the reference channel without dimples. Copyright © 2004 by ASME.
dc.typeConference Paper
dc.contributor.departmentMECHANICAL ENGINEERING
dc.contributor.departmentTEMASEK LABORATORIES
dc.description.sourcetitleAmerican Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED
Appears in Collections:Staff Publications

Show simple item record
Files in This Item:
There are no files associated with this item.


checked on Jan 12, 2022

Page view(s)

checked on Jan 13, 2022

Google ScholarTM



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.