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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

TRANSIENT THERMAL CONVEXITY OF TUBULAR HEAT EXCHANGERS

Moulay A. Abdelghani-Idrissi
Normandie Université LSPC, EA4704, Université/ INSA Rouen, 685 Avenue de l'université, BP 08, 76801 Saint-Etienne-du-Rouvray, France

Dominique Seguin
Normandie Université LSPC, EA4704, Université/ INSA Rouen, 685 Avenue de l'université, BP 08, 76801 Saint-Etienne-du-Rouvray, France

L. Vernières-Hassimi
Normandie Université LSPC, EA4704, Université/ INSA Rouen, 685 Avenue de l'université, BP 08, 76801 Saint-Etienne-du-Rouvray, France

S. Leveneur
Normandie Université LSPC, EA4704, Université/ INSA Rouen, 685 Avenue de l'université, BP 08, 76801 Saint-Etienne-du-Rouvray, France; Laboratory of Industrial Chemistry and Reaction Engineering, Johan Gadolin Process Chemistry Centre, Abo Akademi University, Biskopsgatan 8, FI-20500 Abo/Turku, Finland

Abstract

This paper deals with the transient thermal convexity of tubular heat exchangers. Recently, a fundamental relationship based on the thermal convexity was proposed to describe the thermal behavior of heat exchangers in steady state. This paper treats the extension of this concept to unsteady state thermal behavior of the heat exchangers. The governing equations in transient regime of the thermal convexity coefficients are proposed and a solution with an approximation of a first order response is suggested. The convexity coefficients of both fluids obey to the same transient equations of the temperatures. Analytical expression of the time constants of the thermal convexity coefficients are demonstrated along the tubular heat exchanger when a sudden step change is applied to a mass flow rate of one of the two fluids in co-current and counter current flow arrangements. The thermal convexity times constant of both fluids are similar to those of temperatures compared to experimental measurements obtained from a laboratory pilot-scale heat exchanger [17].

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