Flow towards a Stagnation Region of a Curved Surface in a Hybrid Nanofluid with Buoyancy Effects

Mathematics

Anuar Ishak¹  Ioan Pop²  Iskandar Waini³ 

[1] Department of Mathematical Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, UKM Bangi 43600, Selangor, Malaysia;Department of Mathematics, Babeş-Bolyai University, 400084 Cluj-Napoca, Romania;Fakulti Teknologi Kejuruteraan Mekanikal dan Pembuatan, Universiti Teknikal Malaysia Melaka, Hang Tuah Jaya, Durian Tunggal 76100, Melaka, Malaysia;

关键词: curved surface;    hybrid nanofluid;    mixed convection;    heat transfer;    stability analysis;    stagnation point;   

DOI  :  10.3390/math9182330

来源: DOAJ

【 摘 要 】

This paper examines the impact of hybrid nanoparticles on the stagnation point flow towards a curved surface. Silica (SiO₂) and alumina (Al₂O₃) nanoparticles are added into water to form SiO₂-Al₂O₃/water hybrid nanofluid. Both buoyancy-opposing and -assisting flows are considered. The governing partial differential equations are reduced to a set of ordinary differential equations, before being coded in MATLAB software to obtain the numerical solutions. Findings show that the solutions are not unique, where two solutions are obtained, for both buoyancy-assisting and -opposing flow cases. The local Nusselt number increases in the presence of the hybrid nanoparticles. The temporal stability analysis shows that only one of the solutions is stable over time.

【 授权许可】

Unknown