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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/11134
Title: Condensation of R-134a inside a helically coiled tube-in-shell heat exchanger
Authors: Gupta, A.
Kumar R.
Gupta, Akhilesh Kumar
Published in: Experimental Thermal and Fluid Science
Abstract: This article presents an experimental investigation of heat transfer and pressure drop characteristics of R-134a condensing inside a horizontal helical coil tube with the cooling water flowing in the shell in counter flow direction. The test runs are performed at vapor saturation temperature 35±0.5 and 40±0.5°C for the mass flux varying from 100 to 350kgm-2s-1 and vapor quality ranging from 0.1 to 0.9. The flow regimes observed during the experiment have been plotted on Taitel and Dukler and mass flux versus vapor quality flow map. The transitions between different flow regimes have also been discussed. The effect of mass flux, vapor quality and saturation temperature on the heat transfer coefficient and pressure drop have been investigated. The experimental results of the helical coil tube are compared to straight tube. The thermodynamic advantage of helical coil over straight tube is evaluated in terms of enhancement parameter. The enhancement parameter is higher than one for mass fluxes lower than 200kgm-2s-1. The correlations have been developed to predict two-phase Nusselt number and frictional pressure drop multiplier during condensation of R-134a inside horizontal helical coil tube. © 2014 Elsevier Inc.
Citation: Experimental Thermal and Fluid Science (2014), 54(): 279-289
URI: https://doi.org/10.1016/j.expthermflusci.2014.01.003
http://repository.iitr.ac.in/handle/123456789/11134
Issue Date: 2014
Keywords: Condensation
Enhancement parameter
Heat transfer
Helical coil
Pressure drop
R-134a
ISSN: 8941777
Author Scopus IDs: 57206837453
55389796000
55491955100
Author Affiliations: Gupta, A., Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee 247667, India
Kumar, R., Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee 247667, India
Gupta, A., Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee 247667, India
Funding Details: The authors are grateful to Department of Science & Technology, Ministry of Science &Technology, New Delhi, India for providing the financial support for this project work.
Corresponding Author: Gupta, A.; Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee 247667, India; email: abhinavrac77@gmail.com
Appears in Collections:Journal Publications [ME]

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