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Optimum spacing between grooved tubes : An experimental study
(Article)
, , , ,
Department of Mechanical Engineering, P. A. College of Engineering, Visvesvaraya Technological University,
Mangaluru, India
Department of Mechanical Engineering, N. K. Orchid College of Engineering, Solapur, India
Department of Mechanical Engineering, International Islamic University Malaysia, Kuala Lumpur, Malaysia
Abstract
An experimental study on optimum spacing between grooved tubes is reported in this paper. Two grooved tubes
having pitch of 10 mm and 15 mm and a plain tube were considered for the heat transfer analysis. The spacing
between two tubes with same pitch was varied from 10 mm to 35 mm with a step size of 5 mm. Velocity of air flowing
over the tube surfaces was changed from 0.4 m/s to 1 m/s using a blower fan. Based on Nusselt number (Nu) the
optimum spacing between the tubes was decided. The optimum spacing between grooved tubes of pitch 10 mm and
15 mm was compared with that of plain tubes. From the experimental analysis it was noticed that with increase in air
velocity (increase in Reynolds number) the tube surface temperature reduced irrespective of any tube considered. Nu
increased with increase in air velocity for all the tubes. The important conclusion drawn from the present study was
that, there exists a limiting spacing (optimum) between the tubes above which no change in Nu was observed. Spacing
of 30 mm was found to be the optimum spacing between the tubes irrespective of its surface geometry modifications.
© 2020, The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature.
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Author keywords
Grooved tubes Grooves Heat transfer Nusselt number Optimum spacing
Indexed keywords
Engineering
controlled terms:
Air Heat transfer Nusselt number Reynolds equation Reynolds number
Engineering
uncontrolled terms
Air velocities Experimental analysis Grooved tubes Grooves Heat transfer analysis
Optimum spacing Surface geometries Surface temperatures
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Journal of Mechanical Science and Technology
Volume 34, Issue 1, 1 January 2020, Pages 469-475
Afzal, A.
a
Mohammed Samee, A.D.
b
Abdul Razak, R.K.
a
Khan, S.A.
c
Khan, H.
d
a
b
c
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Condensation | Heat transfer coefficients | Flow condensation
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References (35)
Engineering main
heading:
Tubes (components)
Chang, T.-H.,Lee, K.-S.,Chang, K.-W.,Kim, S.M.,Lee, C.-H.
(2019)
Journal of Mechanical Science and Technology
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Experimental thermal investigation of CuO-W nanofluid in circular minichannel
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ISSN: 1738494X
Source Type: Journal
Original language: English
DOI: 10.1007/s12206-019-1244-7
Document Type: Article
Publisher: Korean Society of Mechanical Engineers
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