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International Heat Transfer Conference 16

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

NUMERICAL INVESTIGATION ON THERMAL AND FLUID DYNAMIC BEHAVIORS OF HEAT EXCHANGER IN ALUMINIUM FOAM

Bernardo Buonomo
Dipartimento di Ingegneria Industriale e dell'Informazione, Università degli Studi della Campania "Luigi Vanvitelli," Aversa (CE), Italy

Anna di Pasqua
Dipartimento di Ingegneria Industriale e dell'Informazione, Università degli Studi della Campania "Luigi Vanvitelli", Via Roma 29, Aversa (CE), Italy

Davide Ercole
Dipartimento di Ingegneria Industriale e dell'Informazione, Università degli Studi della Campania "Luigi Vanvitelli", Via Roma, 29, 81031 Aversa (NA), Italy

Oronzio Manca
Dipartimento di Ingegneria Industriale e dell'Informazione, Università degli Studi della Campania "Luigi Vanvitelli," Aversa (CE), Italy

Sergio Nardini
Dipartimento di Ingegneria Industriale e dell'Informazione, Università degli Studi della Campania "Luigi Vanvitelli", Via Roma 29, Aversa (CE), Italy

DOI: 10.1615/IHTC16.her.023990
pages 4885-4892


KEY WORDS: Heat exchanger, Numerical simulation and super-computing, Metal Foam, Local Thermal non Equilibrium

Abstract

Metal foams represent a relatively new class of materials that have been used in aerospace applications, compact heat sinks and geothermal operations. Metal foam heat exchangers are efficient, compact and light weight for the open porosity and high thermal conductivity of the cell edges, the large accessible surface area per unit volume. A numerical investigation on a compact heat exchanger in aluminum foam is carried out. The volume averaging technique is used to evaluate the thermal and hydraulic performance of tubular heat exchanger with aluminum foam. Two-dimensional simulations are performed using the Darcy-Brinkman-Forchheimer flow model and the thermal non-equilibrium energy condition. The foam has a porosity of 0.93 and different numbers of pores per linear inch (PPI) are analyzed, 10, 20 and 40. The compact heat exchanger at different air flow rates is studied with an assigned surface tube temperature. The results in terms of Nusselt number on the external surface of the tubes for different values of PPI are given. The heat transfer coefficient increases with increasing pores density. Moreover, local air temperature and velocity profiles in the smaller cross section, between two consecutive tubes, as a function of Reynolds number are showed for different values of pores density. To judge the potential of metal foam, the results are compared to the performance of a heat exchanger with the same tube layout without foam. An Energy Performance Ratio (EPR) is assessed in order to evaluate the effectiveness of the metal foam.

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