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All Journal MUST: Journal of Mathematics Education, Science and Technology Postulat : Jurnal Inovasi Pendidikan Matematika
Mohammad Ghani
Northeast Normal University
Computer Science & IT Education Mathematics

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Profil Kecepatan dan Temperatur Pada Aliran Konveksi Campuran Yang Melalui Bola Berpori Dengan Pengaruh Hidrodinamika Magnet Mohamad Tafrikan; Mohammad Ghani
Postulat : Jurnal Inovasi Pendidikan Matematika Vol 1 No 2 (2020)
Publisher : Universitas Muhammadiyah Gresik

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (439.842 KB) | DOI: 10.30587/postulat.v1i2.2091

Abstract

Pada makalah ini, aliran konveksi bebas dan aliran konveksi paksa berperan penting pada aliran konveksi campuran. Dalam hal ini, pengaruh gaya tekanan (pressure forces) dan gaya apung (buoyant forces) pada aliran konveksi bebas menjadi signifikan. Aliran konveksi campuran dapat digunakan pada teknologi reaksi reaktor dan pendingin elektronik. Dalam makalah ini, persamaan lapisan batas (boundary layer) dari aliran konveksi campuran fluida viskoelastik yang melewati permukaan sebuah bola berpori awalnya ditransformasikan kedalam bentuk non-dimensi, kemudian ditransformasikan kedalam bentuk persamaan lapisan batas non-similar yang diselesaikan secara numerik menggunakan metode beda hingga Keller-Box. Hasil numerik pada makalah ini adalah profil kecepatan (
Keller-Box Scheme to Mixed Convection Flow Over a Solid Sphere with the Effect of MHD Mohammad Ghani; Wayan Rumite
MUST: Journal of Mathematics Education, Science and Technology Vol 6, No 1 (2021): JULY
Publisher : Universitas Muhammadiyah Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30651/must.v6i1.8230

Abstract

Mixed convection is the combination of a free convection caused by the buoyancy forces due to the different density and a forced convection due to external forces that increase the heat exchange rate. This means that, in free convection, the effect of external forces is significant besides buoyancy forces. In this study the fluid type with viscoelastic effect is non-Newtonian. The viscoelastic fluids that pass over a surface of a sphere form a thin layer, which due to their dominant viscosity is called by the border layer. The obtained limiting layer is analyzed with the thickness of the boundary layer-  near the lower stagnating point, then obtained dimensional boundary layer equations, continuity, momentum, and energy equations. These dimensional boundary layer equations are then transformed into non-dimensional boundary layer equations by using non-dimensional variables. Further, the non-dimensional boundary layer equations are transformed into ordinary differential equations by using stream function, so that obtained the non-similar boundary layer equations. These non-similar boundary layer equations are solved numerically by using finite difference method of Keller-Box. The discretization results are non-linear and it should be linearized using newton linearization technique. The numerical solutions are analyzed the effect of Prandtl number, viscoelastic, mixed convection, and MHD parameters towards velocity profile, temperature profile, and wall temperature.
Co-Authors Mohamad Tafrikan Wayan Rumite