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- W2945986503 abstract "Natural convection is a heat transfer process which occurs due to temperaturedifferences between a surface and surrounding fluids. Together with fluid flow, naturalconvective heat transfer has been an important interest for energy-related applicationsand production industries. The present study deals with natural convection in enclosureswith different geometries, which are rectangular, triangular, trapezoidal, oblique andwavy enclosures. Different thermal boundary conditions are taken into account as well.The enclosure is two-dimensional and hence the governing equations are derived usingtwo-dimensional Cartesian coordinate system. The enclosure is filled with fluid-saturatedporous medium. Darcy model is used to describe the fluid flow through the porousmedium. Different temperature profiles are applied on the sidewall of the enclosure,and appropriate boundary conditions are formulated for all sidewalls. The governingequations and boundary conditions are dimensional, and hence dimensionless methodis employed to reduce the equations to dimensionless form. Grid generation methodis used to map the non-rectangular domain to a rectangular computational domain.Finite difference approximations are then used to discretize the dimensionless governingequations and boundary conditions. A numerical algorithm is developed to implementthe numerical methods proposed. The discretized governing equations and boundaryconditions are solved iteratively until the convergence is reached. The solutions areobtained graphically to show the fluid flow and temperature distribution inside theenclosure at steady state. Also, heat transfer rate is calculated to determine thesignificance of the model. It is observed that the geometry and thermal boundaryconditions affect the fluid flow and temperature distribution, as well as the heat transferrate inside the enclosure. The heat transfer rate increases with Darcy-Rayleigh number.Also, the raise of internal heat generation reduces the heat transfer rate inside the porousenclosure at high Darcy-Rayleigh number. The wavy porous enclosure has the highestheat transfer rate among all enclosure shapes considered. Constant heating also giveshigher heat transfer rate compared to other temperature profiles (sinusoidal and linearheating)." @default.
- W2945986503 created "2019-05-29" @default.
- W2945986503 creator A5057837653 @default.
- W2945986503 date "2017-03-01" @default.
- W2945986503 modified "2023-09-27" @default.
- W2945986503 title "Numerical study on natural convection in enclosures with different geometries / Cheong Huey Tyng" @default.
- W2945986503 hasPublicationYear "2017" @default.
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