Effect of Different Flow Regimes on Natural Convection Heat Transfer from a Vertical Plate
Publish Year: 1392
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:
ISME21_615
تاریخ نمایه سازی: 17 آبان 1401
Abstract:
In the present study, weak points of all methods until now and the effect of different flow regimes on natural convection heat transfer from a vertical plate are discussed. Furthermore, a new analytical method is developed to calculate natural convection heat transfer from vertical plates which has the potential to be applied to other convex geometries for a wide range of Rayleigh numbers in fluids with any Prandtl number. This method is based on the new concepts of Dynamic Body Gravity and Dynamic Turbulent Functions (DBG & DTF respectively). Also, a new transition criterion from laminar to turbulent flows is introduced and applied in this method. In addition, a correlation is presented to obtain Nusselt for all Rayleigh (Laminar flow - Transition region - Turbulent flow) and Prandtl numbers. Finally, the present results for two isothermal vertical plates and a horizontal cylinder has been compared with the available experimental data. Excellent agreement is found between the proposed model and experimental results in a wide range of Rayleigh numbers with a maximum percentage difference less than ۱۲. This shows that the present model is powerful enough to model natural convectionheat transfer from isothermal convex bodies for a wide range of Rayleigh numbers in fluids with any Prandtl number.
Keywords:
Natural (Free) Convection heat transfer , Isothermal Vertical Plate , Laminar and Turbulent flow , Transition Region , Rayleigh Number and dynamic body gravity and turbulent functions (DBG & DTF)
Authors
Pouria Arabi
M.Sc. Student, School of Mechanical Engineering, Shiraz University
Khosrow Jafarpur
Associate Professor, School of Mechanical Engineering, Shiraz University