• 대한기계학회:학술대회논문집
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• 대한기계학회 2001년도 춘계학술대회논문집D
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• pp.440-446
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• 2001

The pressure drop and heat transfer of the spirally indented tubes were measured and analyzed. Eight sample tubes of indentation depth 0.4, 0.7mm and indentation pitch 10, 14, 20, 26mm were used in this experimental tests. And all the tubes have same outer diameter of 16mm, and same indentation start number of I. Air was used as the internal fluid from 10000 to 50000 for Reynolds Number. The friction factors and heat transfer coefficients have increased when indentation depths increase and indentation pitches decrease. Finally, the correlations were made between the effect of the tube geometry and characteristics of tubes for the pressure drop and heat transfer.