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Computational Analysis of Nanofluid Mixed Convection in a Ventilated Enclosure with Linearly Varying Wall Temperature



Author(s)

Ismail Arroub1, Ahmed Bahlaoui1, Abdelghani Raji2, Mohammed Hasnaoui3 and Mohamed Naϊmi2

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DOI:10.17265/2159-5348/2016.06.007

1. Sultan Moulay Slimane University, Polydisciplinary Faculty, Interdisciplinary Laboratory of Research in Sciences and Technologies (LIRST), B.P. 592, Béni-Mellal 23000, Morocco 2. Sultan Moulay Slimane University, Faculty of Sciences and Technologies, Laboratory of Flows and Transfers Modelling (LAMET), B.P. 523, Béni-Mellal 23000, Morocco 3. Cadi Ayyad University, Faculty of Sciences Semlalia, Laboratory of Fluid Mechanics and Energetics (LMFE), B.P. 2390, Marrakech, Morocco

The characteristic of flow and heat transfer of Al₂O₃-water nanofluids flowing through a horizontal ventilated cavity is investigated numerically. The bottom wall is subjected to a linearly varying increasing heating temperature profile, whereas the other boundaries are assumed to be thermally insulated. The enclosure is cooled by an injected or sucked imposed flow. The simulations are focused specifically on the effects of different key parameters such as Reynolds number, 200 £ Re £ 5,000, nanoparticles concentration, 0 £ f £ 0.1, and mode of imposed flow, on the flow and thermal patterns and heat transfer performances. The findings demonstrate clearly the positive role of the nanoparticles addition on the improvement of the heat transfer rate and the mean temperature within the cavity. Also, the results presented show that, the suction mode is more favorable to the heat transfer in comparison with the case of the injection mode. The cooling efficiency is found to be more pronounced by applying the suction mode.

Mixed convection, nanofluid, injection, suction, linearly varying heating, ventilated cavity.