Effects of Prandtl Number on Three Dimensional Coherent Structures in the Wake behind a Heated Cylinder
سال انتشار: 1400
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 137
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شناسه ملی سند علمی:
JR_JAFM-14-2_014
تاریخ نمایه سازی: 15 دی 1400
چکیده مقاله:
Flow past a heated cylinder kept at constant surface temperature is computationally simulated and analyzed in the laminar regime at moderate buoyancy. In this study, we have restricted to moderate Reynolds numbers to completely eliminate the presence of mode-A and mode-B instabilities. The three dimensional transition due to the mode E instability is captured using a cell-centered finite volume method. The present study reveals the existence of two different kinds of coherent structures - the “surface plumes” and the “mushroom structures”. The role of these mushroom structures in the heat transfer mechanism and the changes that the Prandtl number would bring into this coherent structure are discussed. The mushroom structures observed show high dependency on the changes in Prandtl number whereas the surface plumes are found almost unaffected.
کلیدواژه ها:
نویسندگان
S. Ajith Kumar
Department of Mechanical Engineering, Amrita Vishwa Vidyapeetham, Amritapuri, India-۶۹۰۵۲۵
S. Anil Lal
Department of Mechanical Engineering, College of Engineering Trivandrum, Thiruvananthapuram, India-۶۹۵۰۱۷