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Heat Transfer Research
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ISSN Druckformat: 1064-2285
ISSN Online: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2014006516
pages 507-539

NANOFLUID FLOW HEAT TRANSFER PERFORMANCE IN A SQUARE ENCLOSURE WITH DIFFERENT VENTING LOCATIONS

Mohammad Najafi
Department of Mechanical and Aerospace Engineering, Islamic Azad University, Science and Research Branch, Tehran, Iran
Mahdi Aboujafari
Department of Mechanical and Aerospace Engineering, Islamic Azad University, Tehran Science and Research Branch, Tehran, Iran
Koroush Javaherdeh
Department of Mechanical Engineering, Guilan University, Rasht, Iran

ABSTRAKT

This study considers mixed convection heat transfer performance of a laminar nanofluid flow through a vented two-dimensional square enclosure. The study compares the heat transfer characteristics of the nanofluid in the square enclosure for different locations of the inlet and outlet ports. The enclosure comprises two different constant-temperature top and bottom walls, with the bottom wall being at a differentially higher temperature than its counterpart, and two thermally insulated side walls. The working nanofluid considered is Cu−water with various volume fractions of its solids. The finite volume method together with the SIMPLE algorithm for a uniformly staggered grid is employed as a numerical method. In addition to varying the inlet and outlet vents locations, the Reynolds number, Richardson number, and the nanofluid volume fraction are considered as varying parameters in observing the nanofluid flow and heat transfer throughout the enclosure. To verify the accuracy of the developed computer code utilized, the results of three test cases considered in this work are compared with those of other investigators. The results of the present study show that, although locating both the inlet and outlet ports on the bottom of the two side walls show the highest rate of heat transfer from the bottom hot wall, for high Richardson numbers, locating the inlet on the bottom and the outlet on the top of the opposite side walls gives comparable heat transfer results. Therefore, in cases where the design constraints may not allow placing both the inlet and outlet ports on the bottom, locating the inlet on the bottom and the outlet on the top of the side walls is the best option to secure the highest heat transfer rate from the bottom hot wall.


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