Buoyancy Driven Heat Transfer in Cavities Subjected to Thermal Boundary Conditions at Bottom Wall

سال انتشار: 1391
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 104

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شناسه ملی سند علمی:

JR_JAFM-5-2_006

تاریخ نمایه سازی: 5 بهمن 1400

چکیده مقاله:

Natural convection in cavities is studied numerically using a finite volume based computational procedure. The enclosure used for flow and heat transfer analysis has been bounded by adiabatic top wall, constant temperature cold vertical walls and a horizontal bottom wall. The bottom wall is subjected to uniform/sinusoidal/linearly varying temperatures. Nusselt numbers are computed for Rayleigh numbers (Ra) ranging from ۱۰۳ to ۱۰۷ and aspect ratios (H/L) ۰.۵ and ۱. Air is taken as working fluid (Pr = ۰.۷). Results are presented in the form of stream lines, isotherm plots and average Nusselt numbers. It is observed from this study that the uniform temperature at the bottom wall gives higher Nusselt number compared to the sinusoidal and linearly varying temperature cases. The average Nusselt number increases monotonically with Rayleigh number for both aspect ratio ۱ and ۰.۵ for bottom wall and side walls. For the case of aspect ratio ۱, the average Nusselt number for a given Rayleigh number increases at the bottom wall compared to aspect ratio ۰.۵. However, the average Nusselt number increases as the aspect ratio decreases from ۱ to ۰.۵ for side wall except for uniform temperature case.

نویسندگان

- Aswatha

Department of Mechanical Engineering, Bangalore Institute of Technology, Bangalore, Karnataka, ۵۶۰ ۰۰۴, INDIA

C. J. Gangadhara Gowda

Department of Mechanical Engineering, PES College of Engineering, Mandya - ۵۷۱ ۴۰۱, INDIA

S. N. Sridhara

Rotary Machinery Division, M. S. Ramaiah School of Advanced Studies, Bangalore - ۵۶۰ ۰۵۴, INDIA

K. N. Seetharamu

Department of Mechanical Engineering, PES Institute of Technology, Bangalore - ۵۶۰ ۰۸۵, INDIA