Investigation on Characteristics of Pressure Drop and Heat Transfer in the Spirally Indented Tubes

스파이럴리 인덴티드 전열관 내부에서의 압력 강하 및 전열 특성에 관한 고찰

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.