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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/11021
Title: Augmentation of forced convection condensation heat transfer inside a horizontal tube using spiral spring inserts
Authors: Akhavan-Behabadi M.A.
Salimpoor M.R.
Kumar R.
Agrawal K.N.
Published in: Journal of Enhanced Heat Transfer
Abstract: An experimental investigation has been carried out to study the augmentation of the heat-transfer coefficient during condensation of R-134a vapor inside a horizontal tube with different spiral spring inserts. The test condenser was a double-pipe counter-flow heat exchanger of 1040-mm length the refrigerant flowed inside the inner tube and the cooling water flowed in the annulus. Four spiral springs of 1.0-mm diameter and different pitches of 5, 8, 10, and 13 mm were inserted, one by one, on the refrigerant side of a test-condenser tube. For each spiral spring insert, the data were acquired for the mass flow rates of 87, 105, 122, and 144 kgm2s. The spiral spring of 10-mm pitch gave the highest enhancement in the heat-transfer coefficient, h, in a range of 65 to 75 in comparison to that for a plain tube. Subsequently, three more spiral spring inserts of 10-mm pitch and 0.5-, 0,7-, and 1.5-mm coil-wire diameter were also tested. The spiral spring with 1.5-mm wire diameter outperformed the other spiral spring inserts and increased the condensing side heat-transfer coefficient, h, in a range of 75 to 80 in comparison to that for a plain tube. In addition, the influence of vapor quality on the heat-transfer coefficient, h, is also investigated. An empirical correlation has been developed to predict the heat-transfer coefficient, h, during condensation inside a horizontal tube in the presence of a spiral spring insert. © 2005 by Begell House, Inc.
Citation: Journal of Enhanced Heat Transfer (2005), 12(4): 373-384
URI: https://doi.org/10.1615/JEnhHeatTransf.v12.i4.60
http://repository.iitr.ac.in/handle/123456789/11021
Issue Date: 2005
Keywords: Augmentation
Condenser
Heat transfer
R-134a
Spiral spring insert
Turbulence promoter
ISSN: 10655131
Author Scopus IDs: 6507458788
55892618200
55389796000
7102038358
Author Affiliations: Akhavan-Behabadi, M.A., Department of Mechanical Engineering, Faculty of Engineering, University of Tehran, Tehran, Iran
Salimpoor, M.R., Department of Mechanical Engineering, Faculty of Engineering, University of Tehran, Tehran, Iran
Kumar, R., Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee-247667, India
Agrawal, K.N., Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee-247667, India
Corresponding Author: Kumar, R.; Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee-247667, India; email: ravikfme@iitr.ernet.in
Appears in Collections:Journal Publications [ME]

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