TED-AJ03-315 THE EFFECT OF TURBULENCE ON FORCED CONVECTION FROM A HEATED HORIZONTAL CIRCULAR CYLINDER

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概要

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• The effects of free stream turbulence integral length scale and turbulence intensity (root-mean-square stream-wise component of velocity fluctuation) on the rate of forced convective heat transfer from a heated horizontal circular cylinder in air cross flow were investigated experimentally. An internally heated 5.08 cm (2″) diameter aluminium cylinder was placed horizontally in an 86 cm wide by 66 cm high (34″ by 26″) wind tunnel. The free stream turbulence was generated using a perforated plate at the entrance to the test section. To eliminate the effect of the mean free stream velocity, the Reynolds number based on the cylinder diameter was kept at 27700±550. By altering the solidity ratio (hole spacing) and/or the diameter of the perforated holes the turbulence length scale ratio, L/D, was varied from 0.50 to 1.47 with turbulence intensity fixed at 6.9%±0.2%; and alternatively the turbulence intensity was altered from 2.9% to 8.3% with turbulence length scale ratio fixed at 0.78±0.04. The surface temperature of the cylinder was held constant by adjusting the power supplied by the heater. The free stream turbulence parameters measured in the absence of the cylinder were correlated with the temporal and spatial (mean of the entire cylinder) averaged convective heat transfer coefficient over the range of conditions considered. The data shows that for fixed turbulence length scale, an increase in turbulence intensity leads to an increase in heat transfer whereas for fixed turbulence intensity, an increase in turbulence length scale leads to a decrease in heat transfer.

• 一般社団法人日本機械学会の論文

著者

• Liu Rui

  Departments of Internal Medicine Fukuoka University School of Medicine

• Liu Rui

  Department Of Internal Medicine Fukuoka University School Of Medicine

• Liu Rui

  Department Of Mechanical Automotive & Materials Engineering University Of Windsor

• Sak Christopher

  Department of Mechanical, Automotive & Materials Engineering University of Windsor

• Ting David

  Department of Mechanical, Automotive & Materials Engineering University of Windsor

• Rankin Gary

  Department of Mechanical, Automotive & Materials Engineering University of Windsor

• Ting David

  Department Of Mechanical Automotive & Materials Engineering University Of Windsor

• Rankin Gary

  Department Of Mechanical Automotive & Materials Engineering University Of Windsor

• Sak Christopher

  Department Of Mechanical Automotive & Materials Engineering University Of Windsor

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• TED-AJ03-315 THE EFFECT OF TURBULENCE ON FORCED CONVECTION FROM A HEATED HORIZONTAL CIRCULAR CYLINDER

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