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Heat transfer enhancement in a cubical cavity filled with a hybrid nanofluid
Author(s) -
Ghennai Ahlam,
Bessaїh Rachid
Publication year - 2021
Publication title -
heat transfer
Language(s) - English
Resource type - Journals
eISSN - 2688-4542
pISSN - 2688-4534
DOI - 10.1002/htj.21946
Subject(s) - nanofluid , nusselt number , heat transfer , natural convection , materials science , reynolds number , isothermal process , thermodynamics , heat transfer enhancement , combined forced and natural convection , forced convection , richardson number , mechanics , heat transfer coefficient , physics , buoyancy , turbulence
Mixed convection heat transfer in a cubical cavity with an isothermally heated blockage inside filled with a hybrid nanofluid (HBNF) is numerically studied. The natural convection is created by the temperature difference between the hot block and the cold lateral walls, while the forced convection is generated by moving the upper wall. The influence of some variables, like the aspect ratio (0.1 ≤ r ≤ 0.5), Richardson number (0 ≤ Ri ≤ 20), Reynolds number (50 ≤ Re ≤ 200), volume concentration of nanoparticles (0 ≤ ϕ ≤ 0.06), and the concentration ratio (2:8, 5:5, and 8:2) on the flow field and heat transfer is analyzed. A comparison between hybrid and mono nanofluids (NFs) is realized to investigate the energy transport enhancement. Results show that the increase of each parameter causes an increase of average Nusselt number Nu avg and improves the heat transfer; besides the use of HBNF gives better Nu avg values. Three correlations of the effect of r , ϕ, Ri , and Re on Nu avg are determined for both hybrid and mono NFs.