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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/2853
Title: Numerical studies of a tube-in-tube helically coiled heat exchanger
Authors: Kumar V.
Faizee B.
Mridha M.
Nigam K.D.P.
Published in: Chemical Engineering and Processing: Process Intensification
Abstract: In the present study a tube-in-tube helically coiled (TTHC) heat exchanger has been numerically modeled for fluid flow and heat transfer characteristics for different fluid flow rates in the inner as well as outer tube. The three-dimensional governing equations for mass, momentum and heat transfer have been solved using a control volume finite difference method (CVFDM). The renormalization group (RNG) k-? model is used to model the turbulent flow and heat transfer in the TTHC heat exchanger. The fluid considered in the inner tube is compressed air at higher pressure and cooling water in the outer tube at ambient conditions. The inner tube pressure is varied from 10 to 30 bars. The Reynolds numbers for the inner tube ranged from 20,000 to 70,000. The mass flow rate in the outer tube is varied from 200 to 600 kg/h. The outer tube is fitted with semicircular plates to support the inner tube and also to provide high turbulence in the annulus region. The overall heat transfer coefficients are calculated for both parallel and counter flow configurations. The Nusselt number and friction factor values in the inner and outer tubes are compared with the experimental data reported in the literature. New empirical correlations are developed for hydrodynamic and heat-transfer predictions in the outer tube of the TTHC. © 2008 Elsevier B.V. All rights reserved.
Citation: Chemical Engineering and Processing: Process Intensification (2008), 47(12): 2287-2295
URI: https://doi.org/10.1016/j.cep.2008.01.001
http://repository.iitr.ac.in/handle/123456789/2853
Issue Date: 2008
Keywords: Heat transfer
Helical tube
RNG k-?
Tube-in-tube helical heat exchanger
ISSN: 2552701
Author Scopus IDs: 7404634425
23667183100
23089200400
22980653700
Author Affiliations: Kumar, V., Department of Chemical Engineering, Indian Institute of Technology, Delhi, Hauz Khas, New Delhi, 110016, India
Faizee, B., Department of Chemical Engineering, Indian Institute of Technology, Delhi, Hauz Khas, New Delhi, 110016, India
Mridha, M., Department of Chemical Engineering, Indian Institute of Technology, Delhi, Hauz Khas, New Delhi, 110016, India
Nigam, K.D.P., Department of Chemical Engineering, Indian Institute of Technology, Delhi, Hauz Khas, New Delhi, 110016, India
Corresponding Author: Nigam, K.D.P.; Department of Chemical Engineering, Indian Institute of Technology, Delhi, Hauz Khas, New Delhi, 110016, India; email: nigamkdp@gmail.com
Appears in Collections:Journal Publications [CH]

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