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RESEARCH PAPERS: Heat Exchangers

Transient Response of Two-Phase Heat Exchanger With Varying Convection Coefficients

[+] Author and Article Information
G. F. Naterer

 University of Ontario Institute of Technology, Oshawa, Ontario, Canadagreg.naterer@uoit.ca

C. H. Lam

 Honeywell Aerospace, Mississauga, Ontario L1H 7K4, Canadachunho.lam@honeywell.com

J. Heat Transfer 128(9), 953-962 (Apr 12, 2006) (10 pages) doi:10.1115/1.2241974 History: Received November 10, 2005; Revised April 12, 2006

Transient changes of fluid and wall temperatures in a two-phase heat exchanger are investigated in this article, particularly with respect to spatial and temporal effects of varying convection coefficients. The coupled energy equations for both sides of the heat exchanger are solved directly with an integral method. Varying convection coefficients are related to changes of vapor fraction between the inlet and outlet of the heat exchanger. Unlike past numerical studies encountering difficulties with instability, stiffness, and lack of convergence, the current integral formulation provides a reliable alternative and efficient procedure for transient response within the heat exchanger. Furthermore, complex inversion from a transformed domain is not needed, in contrast to conventional methods with Laplace transforms. In this article, past integral methods are extended to cases with varying convection coefficients, arising from changes of phase fraction on the two-phase side of the heat exchanger, as well a multiple step-changes of temperature. The predicted results show close agreement with past data, including numerical simulations with a dynamic simulator.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of heat exchanger control volumes

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Figure 2

Varying convective heat transfer coefficients

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Figure 3

Fluid and wall temperatures (Case 1)

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Figure 4

Effects of varying convection coefficients (Case 1)

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Figure 5

Fluid and wall temperatures (Case 2)

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Figure 6

Effects of varying convection coefficients (Case 2)

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Figure 7

Fluid and wall temperatures (Case 3)

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Figure 8

Effects of varying convection coefficients (Case 3)

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Figure 9

Spatial variations of fluid and wall temperatures (Case 4)

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Figure 10

Effects of varying convection coefficients (Case 4)

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Figure 11

Spatial temperature variations—(a) Case 5 and (b) Case 6

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Figure 12

Effects of varying convection coefficients (Case 6)

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