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TECHNICAL PAPERS: Heat Exchangers

Transient Behavior of Crossflow Heat Exchangers With Longitudinal Conduction and Axial Dispersion

[+] Author and Article Information
Manish Mishra

Mechanical Engineering Department, Indian Institute of Technology, Kharagpur, India, 721302

P. K. Das

Department of Mechanical Engineering, Indian Institute of Technology, Kharagpur, India, 721302

Sunil Sarangi

Cryogenic Engineering Center, Indian Institute of Technology, Kharagpur, India, 721302

J. Heat Transfer 126(3), 425-433 (Jun 16, 2004) (9 pages) doi:10.1115/1.1738422 History: Received January 13, 2003; Revised March 02, 2004; Online June 16, 2004
Copyright © 2004 by ASME
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References

Figures

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Crossflow heat exchanger (a) schematic representation, and (b) symmetric module considered for analysis
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Schematic representation of perturbation [ϕ(θ)] in inlet temperature of hot fluid
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Comparison of the solutions with the analytical results 8: (a) step, (b) ramp, and (c) exponential inputs for E=R=1,V=λ=0, and Pe=∞
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Two-dimensional temperature distribution of (a) hot fluid, (b) wall, and (c) cold fluid at time θ=1, for (A) step, (B) ramp, and (C) exponential inputs with E=R=V=Pe=1, NTU=2, λ=0.025 with no flow transients
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Effect of aspect ratio (Y/X) on mean exit temperature of both the fluids with (a) step, (b) ramp, and (c) exponential inputs without longitudinal conduction and axial dispersion
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Effect of heat capacity rate ratio on mean exit temperature of both the fluids for step input
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Effect of fluid capacitance ratio on step response of mean exit temperature of hot and cold fluids (a) without longitudinal conduction and axial dispersion, and (b) with longitudinal conduction and axial dispersion
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Effect of axial dispersive Peclet number, Pe on mean exit temperature of both the fluids
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Conductive heat transfer due to axial dispersion in any of the fluid streams
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Mean exit temperature of hot and cold fluids due to axial dispersion for step change in hot fluid inlet temperature
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Effect of capacitance ratio on step response of hot and cold fluid mean exit temperatures
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Change in exit temperature of (a) hot and (b) cold fluid due to longitudinal conduction with and without fluid axial dispersion for step input

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