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Research Papers: Heat Exchangers

Transient Behavior of Crossflow Heat Exchangers Due To Sinusoidal Excitation

[+] Author and Article Information
Manish Mishra1

Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee 247667, Indiamishra_md@yahoo.com mmishfme@iitr.ernet.in

P. K. Das

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

Sunil Sarangi

 National Institute of Technology, Rourkela 769008, Indiasarangiskr@nitrkl.ac.in director@nitrkl.ac.in

1

Corresponding author.

J. Heat Transfer 132(9), 091801 (Jun 23, 2010) (9 pages) doi:10.1115/1.4001605 History: Received September 19, 2008; Revised January 23, 2010; Published June 23, 2010; Online June 23, 2010

Transient temperature response of crossflow heat exchangers with both fluids unmixed and finite wall capacitance is investigated numerically for sinusoidal excitation provided in hot fluid inlet temperature. The effect of two-dimensional longitudinal conduction in separating sheet and the axial dispersion in fluids has also been considered on the thermal performance of the heat exchanger. The present method has good accuracy and simplicity. An attempt has also been made to study the performance of the sinusoidal excitation in the graphical form.

Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

(a) Crossflow heat exchanger and (b) schematic representation

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Figure 2

Comparison of the solutions with the analytical results (10) for (a) step, (b) ramp, and (c) exponential inputs

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Figure 3

Heat exchanger area and the points selected for the study of temperature oscillations

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Figure 4

Temperature oscillations with time for the five points shown in Fig. 3

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Figure 5

Exit temperature behavior of (a) fluid a and (b) fluid b at different time levels

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Figure 6

Variation of mean exit temperatures with time for different NTUs. (a) Hot and (b) cold fluids.

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Figure 7

Variation of mean exit temperature of hot and cold fluids with the change in frequency of input excitations

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Figure 8

Effect of heat capacity rate ratio on mean exit temperature of (a) hot and (b) cold fluids in the absence of longitudinal conduction in wall and fluid axial dispersion

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Figure 9

Effect of heat capacity ratio on mean exit temperature of both the fluids on sinusoidal response without longitudinal conduction in wall and fluid axial dispersion

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Figure 10

Effect of longitudinal conduction on exit temperature response of hot and cold fluids at NTUs (a) 2 and (b) 8

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Figure 11

% change in hot fluid mean exit temperature with time due to longitudinal conduction at NTU (a) 2, (b) 4, and (c) 8 for E=R=V=1 and Pe=∞

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Figure 12

% change in cold fluid mean exit temperature with time due to longitudinal conduction at NTU (a) 2, (b) 4, and (c) 8 for E=R=V=1 and Pe=∞

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Figure 13

Effect of axial dispersive Peclet number, Pe, on mean exit temperature of (a) hot and (b) cold fluids

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Figure 14

Graphical representations of (a) hot and (b) cold fluid mean exit temperatures with hot fluid inlet temperature for infinite wall capacity

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Figure 15

Graphical representations of (a) hot and (b) cold fluid mean exit temperatures with hot fluid inlet temperature for finite wall capacity

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