Transient temperature fields in crossflow heat exchangers with finite wall capacitance

Journal Article · Mon Feb 01 04:00:00 EST 1988 · Journal of Heat Transfer (Transactions of the ASME (American Society of Mechanical Engineers), Series C); (United States)

DOI:https://doi.org/10.1115/1.3250471· OSTI ID:6062696

Spiga, M ^[1]; Spiga, G ^[2]

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1. Univ. di Bologna (Italy)
2. Univ. di Bari (Italy)

Solutions are provided in non dimensional form for the transient analysis of direct-transfer crossflow heat exchangers, with both fluids unmixed and finite wall heat capacity. The two-dimensional transient temperature distributions of core wall and both fluids are determined by analytical methods for any externally applied variation of the primary fluid inlet temperature. The general solutions are derived by the local energy balance equations, and are presented as simple integrals of the Green's functions, which represent the pulse response following a deltalike perturbation in the inlet temperature of the primary fluid, and are deduced using the Laplace transform method. The Green's functions are expressed as integrals of modified Bessel functions, in terms of the heat capacity ratios, number of transfer units, heat transfer resistance and flow capacitance ratios.

• OSTI ID: 6062696
• Journal Information: Journal of Heat Transfer (Transactions of the ASME (American Society of Mechanical Engineers), Series C); (United States), Journal Name: Journal of Heat Transfer (Transactions of the ASME (American Society of Mechanical Engineers), Series C); (United States) Vol. 110:1; ISSN 0022-1481; ISSN JHTRA
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
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42 ENGINEERING
420400* -- Engineering-- Heat Transfer & Fluid Flow
CROSSFLOW SYSTEMS
ENERGY BALANCE
HEAT EXCHANGERS
REACTORS
TEMPERATURE DISTRIBUTION
TRANSIENTS