Optimizing naturally driven air flow in a vertical pipe by changing the intensity and location of the wall heat flux
Publish place: Journal of Computational and Applied Research in Mechanical Engineering، Vol: 5، Issue: 2
Publish Year: 1395
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_JCARME-5-2_005
تاریخ نمایه سازی: 7 شهریور 1396
Abstract:
Heat transfer from the internal surfaces of a vertical pipe to the adjacent air gives rise to the air flow establishment within the pipe. With the aim of optimizing the convective air flow rate in a vertical pipe, the details of theflow and thermal fields were investigated in the present study. Conservation equations of mass, momentum, and energy were solved numerically using simple implicit forward-marching finite difference scheme for a twodimensionalaxis-symmetric flow. In order to evaluate and optimize the air flow rate passing through the pipe, the position and intensity of the wall heat flux were altered when the total employed heat transfer rate was constant.Based on the results of the numerical analysis, relatively more air flow rate was achieved when more intensified heat flux was employed at the lowestpart of the vertical pipe. This finding was then validated using a simpleexperimental setup. The results of the present study could be useful in the design and application of buoyancy-assisted natural ventilation systems
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Authors
m Rahimi
Faculty of Engineering, University of Mohaghegh Ardabili, Ardabil, Iran
m Khalafi-Salout
Faculty of Engineering, University of Mohaghegh Ardabili, Ardabil, Iran