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Computational Thermal Sciences: An International Journal

ISSN Print: 1940-2503
ISSN Online: 1940-2554

Computational Thermal Sciences: An International Journal

DOI: 10.1615/ComputThermalScien.2015011809
pages 15-34

ENHANCED MIXED CONVECTION AND HEAT TRANSFER BY NANOFLUID IN VENTILATED SQUARE ENCLOSURE INCLUDING TWO HEAT SOURCES

Hamdi Moumni
Thermal Radiation Laboratory, Fac. Sci. of Tunis, University of Tunis El Manar, Tunisia
Ezeddine Sediki
Thermal Radiation Laboratory, Fac. Sci. of Tunis, University of Tunis El Manar, Tunisia

ABSTRACT

In the present study, enhanced mixed convection and heat transfer by nanofluid in a ventilated square enclosure including two heat sources was investigated numerically. The governing equations are solved using a second-order accurate finite volume approach with a staggered grid system. The classical projection method is used to handle the velocity-pressure coupling. The effects of monitoring parameters, namely, Richardson number, Reynolds number, and solid volume fraction on the streamline and isotherm contours as well as average Nusselt number along the two heat sources are carried out and discussed in based range for Reynolds number 10 ≤ Re ≤ 500, Richardson numbers 0.1 ≤ Ri ≤ 10, and the solid volume fraction 0 ≤ Φ ≤ 0.1. The results show that by adding the nanoparticles to base fluid and increasing both Reynolds and Richardson number the heat transfer rate is enhanced. It is also found that, regardless of the Richardson number, Reynolds number, and the solid volume fraction of nanoparticles, the highest heat transfer enhancement occurs at the left heat source surface.