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Research Papers: Heat Exchangers

Dynamic Behavior of Three-Fluid Crossflow Heat Exchangers

[+] Author and Article Information
Manish Mishra1

Department of Mechanical Engineering, National Institute of Technology, Raipur (formerly Government Engineering College, Raipur), India 492001mishra_md@yahoo.com

P. K. Das

Department of Mechanical Engineering, Indian Institute of Technology, Kharagpur, India 721302pkd@mech.iitkgp.ernet.in

Sunil Sarangi

Cryogenic Engineering Centre, Indian Institute of Technology, Kharagpur, India 721302ssarangi@hijli.iitkgp.ernet.in

1

Corresponding author.

J. Heat Transfer 130(1), 011801 (Jan 30, 2008) (7 pages) doi:10.1115/1.2401616 History: Received April 05, 2005; Revised August 26, 2006; Published January 30, 2008

A transient temperature response of three-fluid heat exchangers with finite and large capacitance of the separating sheets is investigated numerically for step, ramp, exponential, and sinusoidal perturbations provided in the central (hot) fluid inlet temperature. The effect of two-dimensional longitudinal conduction in the separating sheet and of axial dispersion in the fluids on the transient response has been investigated. A comparison of the dynamic behavior of four possible arrangements of three-fluid crossflow heat exchangers has also been presented.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Four possible arrangements for three-fluid single-pass crossflow heat exchanger (9)

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Figure 2

Schematic representation of (a) flow and separating sheet with fins and (b) distribution of convective resistance of fluid b and the heat capacity of the separating sheet with fins

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Figure 3

Validation of the numerical results with the analytical steady state solutions (8)

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Figure 4

Effect of NTU on (a) step, (b) ramp, (c) exponential, and (d) sinusoidal response for three-fluid crossflow heat exchanger with large core capacity in the absence of longitudinal conduction and axial dispersion

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Figure 5

Steady state variation of mean exit temperature of the three fluids with respect to the hot fluid inlet temperature for sinusoidal excitation

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Figure 6

Variation of mean exit temperature of the three fluids with conductance ratio R

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Figure 7

Effect of longitudinal conduction on step response of mean exit temperature of the three fluids for arrangement C4

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Figure 8

Effect of axial dispersion on step response of mean exit temperature of the three fluids for arrangement C4

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Figure 9

Comparison of the four possible arrangements of three-fluid crossflow heat exchanger for step response. (a) fluid a, (b) fluid b, and (c) fluid c.

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