Overview
ABSTRACT
Heat Transfer Enhancement has overcome the laboratory field for several years, and is widely spread in industrial applications. Many heat exchangers in various processes are now equipped with plates or tubes especially designed to increase the heat transfer coefficients, which exhibit high operational values well above those obtained with flat surfaces.
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Read the articleAUTHORS
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Philippe BANDELIER: French Atomic Energy and Alternative Energies Commission (Grenoble)
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Nadia CANEY: Joseph Fourier University, Geophysical and Industrial Flow Laboratory (Grenoble)
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Zoé MINVIELLE: French Atomic Energy and Alternative Energies Commission (Grenoble) - This article is an updated reprint of the article [BE 2 343] entitled "Échangeurs de chaleur – Intensification des échanges thermiques" (Heat exchangers ) published in February 1994, written by André BONTEMPS, Alain GARRIGUE, Charles GOUBIER, Jacques HUETZ, Christophe MARVILLET, Pierre MERCIER, Roland VIDIL.
INTRODUCTION
The main function of any heat exchanger is to transfer enthalpy from one fluid to another by means of a temperature difference. The exchange surface to be provided, and therefore the cost of the heat exchanger, depends directly on this temperature difference and the heat exchange coefficient. Intensifying heat exchange therefore contributes directly to reducing the exchange surface to be installed and, potentially, the cost of the exchanger, if the technique used does not result in an additional cost greater than the gain in surface area. At constant exchanger cost, the benefit can also be passed on to the thermal service rendered, thus improving the energy efficiency of a thermal process. Nevertheless, in some cases, the cost criterion may be secondary to other advantages, such as exchanger compactness or, for example, pushing back the critical heat flow at which the wall temperature becomes too high. All heat exchanger applications are concerned: single-phase exchangers, double-phase exchangers (evaporation and condensation) and multi-function exchangers combining heat transfer with mass transfer or a chemical reaction.
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KEYWORDS
enhancement | single phase flow | two phase flow
Heat exchangers
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