کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4993339 | 1457619 | 2016 | 14 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effect of side ratio on fluid flow and heat transfer from rectangular cylinders using the PANS method
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
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چکیده انگلیسی
A computational study of heat transfer from rectangular cylinders is carried out. Rectangular cylinders are distinguished based on the ratio of the length of streamwise face to the height of the cross-stream face (side ratio, R). The simulations were performed to understand the heat transfer in a flow field comprising separation, reattachment, vortex shedding and stagnation. The Partially-Averaged Navier-Stokes (PANS) modeling approach is used to solve the turbulent flow physics associated and the wall resolve approach is used for the near wall treatment because of the flow separation involved. The simulations were performed using a finite volume based opensource software, OpenFOAM, at Reynolds number (Re)Â =Â 22,000 for rectangular cylinder at constant temperature kept in an air stream. Two critical side ratios were obtained, RÂ =Â 0.62 and 3.0. At RÂ =Â 0.62, the maximum value of the drag coefficient (Cd)Â =Â 2.681 was observed which gradually reduced by 54% at RÂ =Â 4.0. The base pressure coefficient and global Nusselt number also attained the maximum value at RÂ =Â 0.62 and from RÂ =Â 2.5 to 3.0 a sharp discontinuous increase by 140% in the Strouhal number was observed. At RÂ =Â 0.62, it was observed that the separated flow reattaches at the trailing edge after rolling over the side face and therefore increases the overall Nusselt number. The phase averaging was also performed to analyze the unsteady behavior of heat transfer.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Fluid Flow - Volume 61, Part B, October 2016, Pages 309-322
Journal: International Journal of Heat and Fluid Flow - Volume 61, Part B, October 2016, Pages 309-322
نویسندگان
Pritanshu Ranjan, Anupam Dewan,