Effects of cavity and heat source aspect ratios on natural convection of a nanofluid in a C-shaped cavity using Lattice Boltzmann method. Issue 8 (6th August 2018)

• Record Type: Journal Article
• Authors: Izadi, Mohsen; Mohebbi, Rasul; Chamkha, A.; Pop, Ioan
• Is Part Of: International journal of numerical methods for heat & fluid flow. Volume 28:Issue 8(2018)
• Page Start: 1930
• Page End: 1955
• Publication Date: 2018-08-06
• Subjects: Nanofluid -- Lattice Boltzmann method -- Aspect ratio of cavity -- Aspect ratio of heat source -- C-shaped cavity -- Natural convection heat transfer; Heat -- Transmission -- Mathematics -- Periodicals; Fluid dynamics -- Mathematics -- Periodicals; 536.2
• DOI: 10.1108/HFF-03-2018-0110
• Languages: English
• ISSNs: 0961-5539

Abstract

Abstract : Purpose: The purpose of this paper is to consider natural convection of a nanofluid inside of a C-shaped cavity using Lattice Boltzmann method (LBM). Design/methodology/approach: Effects of some geometry and flow parameters consisting of the aspect ratio of the cavity, aspect ratio of the heat source; Rayleigh number (Ra = 10 3 − 10 6 ) have been investigated. The validity of the method is checked by comparing the present results with ones from the previously published work. Findings: The results demonstrate that for Ra = 10 3, the aspect ratio of the heat source has more influence on the average Nusselt number in contrast to the case of Ra = 10 6 . Contrary to the fact that the average Nusselt number increases non-linearly more than twice because of the increase of the aspect ratio of the enclosure at Ra = 10 3, the average Nusselt number has a linear relation with the aspect ratio for of Ra = 10 6 . Therefore, upon increasing the Rayleigh number, the efficiency of the aspect ratio of the cavity on the thermal convection, gradually diminishes. Originality/value: The authors believe that all the results, both numerical and asymptotic, are original and have not been published elsewhere.