Effects of Tripping Wires on Heat Transfer from a Circular Cylinder in Cross Flow : 1st Report, The Pressure Distribution around the Cylinder and the Drag Coefficient

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概要

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• For a circular cylinder of diameter D=50mm attached tripping wires in cross flow, the pressure distribution around it, the drag coefficient and the Strouhal number were measured at a Reynolds number of Re=5×10^4, varying the diameter of the wires d=0.1 to 2.0 mm and the angle θ from the frontal stagnation point to the wire from 15 to 90 degrees. The pressure distributions were classified into three patterns. When the distribution was similar to that which should be observed in the critical state (i.e., at about Re=8.5 ×10^5), the drag coefficient of the cylinder with tripping wires of d = 0.3 to 2.0 mm was reduced to about a half that of a bare cylinder and then the tripping wires could be considered effective. The range of θ in which the wires brought about reduction in drag was rather narrow, and when the angle θ was over this range, the drag rapidly exceeded that of the bare cylinder and the pressure distribution also changed in shape.

• 一般社団法人日本機械学会の論文

著者

• FUJITA Hideomi

  Department of Mechanical Engineering, Nagoya University

• TAKAHAMA Heishichiro

  Nagoya University

• Kawai Tadao

  Department Of Mechanical & Physical Engineering Osaka City University

• Kawai Tadao

  Department Of Mechanical Engineering Nagoya University

• Fujita Hideomi

  Department Of Mechanical Engineering Nagoya University

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