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Pressure drop characteristics in a rib roughened rotating square duct with a sharp 180 degrees bend

DSpace at IIT Bombay

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Title Pressure drop characteristics in a rib roughened rotating square duct with a sharp 180 degrees bend
 
Creator PRABHU, SV
VEDULA, RP
 
Subject turbine blade cooling
pressure drop
rib turbulators
orthogonal rotation
sharp bend
rough duct
 
Description An experimental investigation was carried out to study the local pressure drop distribution in a square cross-sectioned channel with a sharp 180degrees bend rotating about an axis normal to the free-stream direction in the presence of rib turbulators. The sharp 180degrees turn was obtained by dividing a rectangular passage into two channels using a divider wall with a rounded tip where the flow negotiates the turn. The study was conducted for three ratios of divider wall thickness to hydraulic diameter (W/D), 0.24,0.37, and 0.73. The rib height-to-hydraulic diameter ratio (e/D) was maintained constant at 0.1 with a constant pitch-to-rib height ratio (P/e) of 10. The ribs are configured in a staggered arrangement with angles of 60degrees and 90degrees to the main-stream flow, with ribbed surfaces forming the leading and trailing surface during rotation. The Reynolds number was varied from 10,000 to 17,000, with the rotation number varying from 0-0.38. The pressure drop distribution normalized with the mainstream pressure head being presented for the leading surface, trailing surface, and outer surface. The friction factor is less sensitive to the variations in the W/D ratio for a given rib angle, both in the stationary and rotating conditions. The pressure drop distribution for the 90degrees ribs remains practically unchanged under conditions of rotation. However, the pressure drops for the 60degrees ribs are smaller than without rotation. At the highest rotation number, the pressure drop obtained by both 60degrees and 90degrees ribs are comparable.
 
Publisher BEGELL HOUSE INC
 
Date 2011-07-18T23:20:44Z
2011-12-26T12:50:52Z
2011-12-27T05:37:03Z
2011-07-18T23:20:44Z
2011-12-26T12:50:52Z
2011-12-27T05:37:03Z
2003
 
Type Article
 
Identifier JOURNAL OF ENHANCED HEAT TRANSFER, 10(4), 363-377
1065-5131
http://dx.doi.org/10.1615/JEnhHeatTransf.v10.i4.20
http://dspace.library.iitb.ac.in/xmlui/handle/10054/5098
http://hdl.handle.net/10054/5098
 
Language en