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Heat transfer and pressure drop in a spirally grooved tube with twisted tape insert

DSpace at IIT Bombay

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Title Heat transfer and pressure drop in a spirally grooved tube with twisted tape insert
 
Creator BHARADWAJ, P
KHONDGE, AD
DATE, A
 
Subject corrugated tubes
compound heat transfer enhancement
spirally grooved tube
twisted tape insert
 
Description In this paper, experimentally determined pressure drop and heat transfer characteristics of flow of water in a 75-start spirally grooved tube with twisted tape insert are presented. Laminar to fully turbulent ranges of Reynolds numbers have been considered. The grooves are clockwise with respect to the direction of flow. Compared to smooth tube, the heat transfer enhancement due to spiral grooves is further augmented by inserting twisted tapes having twist ratios Y similar or equal to 10.15, 7.95 and 3.4. It is found that the direction of twist (clockwise and anticlockwise) influences the thermo-hydraulic characteristics. Constant pumping power comparisons with smooth tube characteristics show that in spirally grooved tube with and without twisted tape, heat transfer increases considerably in laminar and moderately in turbulent range of Reynolds numbers. However, for the bare spiral tube and for spiral tube with anticlockwise twisted tape (Y = 10.15), reduction in heat transfer is noticed over a transition range of Reynolds numbers. (C) 2008
 
Publisher PERGAMON-ELSEVIER SCIENCE LTD
 
Date 2011-08-25T04:52:46Z
2011-12-26T12:56:55Z
2011-12-27T05:46:27Z
2011-08-25T04:52:46Z
2011-12-26T12:56:55Z
2011-12-27T05:46:27Z
2009
 
Type Article
 
Identifier INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 52 (7-8), 1938-1944
0017-9310
http://dx.doi.org/10.1016/j.ijheatmasstransfer.2008.08.038
http://dspace.library.iitb.ac.in/xmlui/handle/10054/10900
http://hdl.handle.net/10054/10900
 
Language en