Effects of a Strip Inserted in the Boundary Layer on Heat Transfer from a Plane Surface : Distribution of Heat Transfer Coefficients

概要

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As a means for an augmentation of heat transfer, a strip 10 mm wide was inserted in the turbulent boundary layer on a heated plane surface. Distributions of the local heat transfer coefficient on the plane surface were measured when both the inclination angle of the strip φ and the clearance c between the surface and the strip were varied. When the clearance is increased while keeping the angle φ constant, the distribution of local heat transfer coefficients undergoes similar changes in distribution pattern irrespective of the angle φ, although the magnitude of the clearance causing the change in the pattern is different. The mean heat transfer coefficient over a surface of length x^^- downstream from the strip varies with x^^-, and the mode of variation depends heavily on the clearance and the inclination angle. One of the most preferable distributions in this experiment was obtained when φ=45° and c=4 mm.
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