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Local heat transfer coefficient in helical coils with single phase flow

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Title Local heat transfer coefficient in helical coils with single phase flow
 
Creator HARDIK, BK
BABURAJAN, PK
PRABHU, SV
 
Subject NON-NEWTONIAN FLUIDS
TURBULENT-FLOW
PRESSURE-DROP
LAMINAR-FLOW
CURVED PIPES
TUBES
TRANSITION
REGIME
Local heat transfer coefficient
Circumferentially averaged Nusselt number
Thermal infrared imaging
Helical coil
Curvature ratio
 
Description The objective of the present work is to study the influence of curvature and Reynolds number on local heat transfer coefficient in a helical coil with water as the working medium. The local wall temperature is measured not only in the axial direction (along the length of coil) but also in the circumferential direction using infrared thermal imaging technique. The test sections are made of thin walled stainless steel (SS 304) tubes having an inner diameter varying from 5.4 to 7.5 mm with a thickness of 0.2 and 0.25 mm. The coil diameter to the tube diameter ratio ranges from 13.1 to 67 and coil pitch is 50 mm. The experimental results of friction factor and overall averaged total Nusselt number are compared with the available correlations in the literature. Correlations are suggested for overall averaged and local circumferentially averaged Nusselt number for inner side, outer side and total surface (inner side and outer side) of a helical coil. (C) 2015 Elsevier Ltd. All rights reserved.
 
Publisher PERGAMON-ELSEVIER SCIENCE LTD
 
Date 2016-01-14T13:55:41Z
2016-01-14T13:55:41Z
2015
 
Type Article
 
Identifier INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 89,522-538
0017-9310
1879-2189
http://dx.doi.org/10.1016/j.ijheatmasstransfer.2015.05.069
http://dspace.library.iitb.ac.in/jspui/handle/100/17667
 
Language en