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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/2857
Title: Laminar convective heat transfer in chaotic configuration
Authors: Kumar V.
Nigam K.D.P.
Published in: International Journal of Heat and Mass Transfer
Abstract: The convective heat transfer in chaotic configuration of circular cross-section under laminar flow regime at different values of Dean number and Prandtl number is investigated numerically. The chaotic configuration is the combination of 90° bends and coils. The insertion of equidistant 90° bends between the two consecutive coil produces the phenomenon of flow inversion. The hydrodynamics and heat transfer under laminar flow conditions in the chaotic configuration with constant wall flux as a boundary condition is studied. The control-volume finite difference method with second-order accuracy is used. The chaotic configuration shows a 25-36% enhancement in the heat transfer due to chaotic mixing while relative pressure drop is 5-6%. The effect of Prandtl number on fully developed heat transfer coefficient is also reported. It is observed that heat transfer increases with increase in Prandtl number. The stretching and folding phenomenon in chaotic configuration is observed and discussed for heat transfer coefficient and pressure drop in the chaotic configuration. The cyclic oscillation behavior in the heat transfer coefficient with downstream distance in the chaotic configuration and coiled tube is also observed and discussed. It appeared that heat transfer is strongly influenced by flow inversion. The effect of boundary conditions on heat transfer performance in the chaotic configuration as well as in the coiled tube is also carried out. The study is further extended to predict hydrodynamics and heat transfer with temperature-dependent viscosity in the chaotic configuration. A comparative study for heat transfer and friction factor is also carried out for constant and temperature-dependent viscosity in coiled tube and chaotic configuration. It was observed that the heat transfer under heating condition with temperature-dependent viscosity is higher as compared to the constant viscosity result while friction factor shows the reverse phenomenon in the chaotic configuration. © 2007 Elsevier Ltd. All rights reserved.
Citation: International Journal of Heat and Mass Transfer (2007), 50(13-14): 2469-2479
URI: https://doi.org/10.1016/j.ijheatmasstransfer.2006.12.029
http://repository.iitr.ac.in/handle/123456789/2857
Issue Date: 2007
Keywords: CFD
Chaotic configuration
Heat transfer
Helical tube
Uniform wall heat flux
ISSN: 179310
Author Scopus IDs: 7404634425
22980653700
Author Affiliations: Kumar, V., Department of Chemical Engineering, Indian Institute of Technology, Delhi, Hauz Khas, New Delhi, 110 016, India
Nigam, K.D.P., Department of Chemical Engineering, Indian Institute of Technology, Delhi, Hauz Khas, New Delhi, 110 016, India
Funding Details: The authors gratefully acknowledge the Ministry of Chemical and Fertilizers, GOI, India for funding the project.
Corresponding Author: Nigam, K.D.P.; Department of Chemical Engineering, Indian Institute of Technology, Delhi, Hauz Khas, New Delhi, 110 016, India; email: nigamkdp@gmail.com
Appears in Collections:Journal Publications [CH]

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