Investigation of Double Diffusive Natural Convection of Viscoplastic fluids- Casson Model in a trapezoidal Enclosure.

نوع: Type: thesis

مقطع: Segment: masters

عنوان: Title: Investigation of Double Diffusive Natural Convection of Viscoplastic fluids- Casson Model in a trapezoidal Enclosure.

ارائه دهنده: Provider: amirhesam sangi

اساتید راهنما: Supervisors: Dr.Aghighi

اساتید مشاور: Advisory Professors:

اساتید ممتحن یا داور: Examining professors or referees: D.Norbakhsh-Dr.Godarzi

زمان و تاریخ ارائه: Time and date of presentation: 2022

مکان ارائه: Place of presentation: سمینار3 مکانیک

چکیده: Abstract: In this study, Double Diffusive Natural Convection of Viscoplastic fluids- Casson Model in a trapezoidal Enclosure with different thermal boundaries is investigated numerically. Partial differential equations that govern fluid flow and heat transfer (using the finite element method), for different value of the Rayleigh number (〖10〗^4 ≤Ra ≤ 〖10〗^6), yield number (0 ≤Y ≤ Y_Max), Lewis number (0.5 ≤ Le ≤ 10), Buoyancy ratio number (-0.5 ≤ Nr ≤1), For a value of Prandtl number (Pr = 10) have been solved. The temperature, flow and concentration fields in the cavity were analyzed using temperature, flow and concentration contours. Also the yielded and unyielded areas formed in different parts of the current configuration are specified. The rate of heat transfer in different states was measured using local and mean Nusselt numbers,local and mean Sherwood numbers. The results show that the average Nusselt and Sherwood numbers increase with the increase of the Rayleigh number, and finally, the increase in viscosity causes the flow to stagnate, in this case, the amount of heat transfer will be equal to conductive heat transfer.In addition, Lewis number does not have much effect on heat transfer and flow, but it affects mass transfer (concentration) and as it increases, the concentration profile becomes more nonlinear. Also, the effect of the buoyancy parameter was investigated, and according to the analysis, it was found that the increase of the buoyancy parameter increases the flow and increases the heat transfer in the chamber. The effect of angle change was also investigated as an effective parameter on heat transfer and flow and it was found that increasing the slope angle of the inclined walls of the trapezoidal Enclosure, weakens the flow and reduces the heat transfer in the Enclosure

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