Heat transfer and pressure drop in tube with broken twisted tape insert

Journal Article · Thu Nov 15 04:00:00 EST 2007 · Experimental Thermal and Fluid Science

DOI:https://doi.org/10.1016/J.EXPTHERMFLUSCI.2007.06.002· OSTI ID:20975365

Chang, Shyy Woei; Yang, Tsun Lirng; Liou, Jin Shuen ^[1]

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1. Thermal Fluids Laboratory, Department of Marine Engineering, National Kaohsiung Marine University, No. 142, Haijhuan Road, Nanzih District, Kaohsiung, Post Code 811 (China)

An experimental study measuring the axial heat transfer distributions and the pressure drop coefficients of the tube fitted with a broken twisted tape of twist ratio 1, 1.5, 2, 2.5 or {infinity} is performed in the Re range of 1000-40,000. This type of broken twisted tape is newly invented without previous investigations available. Local Nusselt numbers and mean Fanning friction factors in the tube fitted with the broken twisted tape increase as the twist ratio decreases. Heat transfer coefficients, mean Fanning friction factors and thermal performance factors in the tube fitted with the broken twisted tape are, respectively, augmented to 1.28-2.4, 2-4.7 and 0.99-1.8 times of those in the tube fitted with the smooth twisted tape. Empirical heat transfer and pressure drop correlations which evaluate the local Nusselt number and the mean Fanning friction factor for the tube with the broken twisted tape insert are generated to assist the industrial applications. (author)

• OSTI ID: 20975365
• Journal Information: Experimental Thermal and Fluid Science, Journal Name: Experimental Thermal and Fluid Science Journal Issue: 2 Vol. 32; ISSN 0894-1777; ISSN ETFSEO
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
AUGMENTATION
CORRELATIONS
DISTRIBUTION
FRICTION FACTOR
HEAT TRANSFER
NUSSELT NUMBER
PERFORMANCE
PRESSURE DROP
REYNOLDS NUMBER
TUBES