Heat transfer and pressure drop in hexagonal ducts with surface dimples

Journal Article · Mon Nov 15 00:00:00 EST 2010 · Experimental Thermal and Fluid Science

DOI:https://doi.org/10.1016/J.EXPTHERMFLUSCI.2010.04.006· OSTI ID:21350387

Chang, S W ^[1]; Chiang, K F ^[2]; Chou, T C ^[3]

---

1. Thermal Fluids Laboratory, National Kaohsiung Marine University, No. 142, Haijhuan Road, Nanzih District, Kaohsiung City 81143 (China)
2. Thermal Dissipation Department, AVC International Company (China)
3. Department of Marine Engineering, National Kaohsiung Marine University (China)

Measurements of detailed Nusselt number (Nu) distributions and pressure drop coefficients (f) for four hexagonal ducts with smooth and dimpled walls are performed to comparatively examine the thermal performances of three sets of dimpled walls with concave-concave, convex-convex and concave-convex configurations at Reynolds numbers (Re) in the range of 900-30,000. A set of selected experimental data illustrates the influences of dimple configuration and Re on the detailed Nu distributions, the area-averaged Nu over developed flow region (Nu-bar) and the pressure drop coefficients. Relative enhancements of Nu and f from the smooth-walled references (Nu{sub {infinity}} and f{sub {infinity}}) along with the thermal performance factor ({eta}) defined as (Nu-bar/Nu{sub {infinity}})/(f/f{sub {infinity}}){sup 1/3} are examined. Nu-bar and f correlations are individually obtained for each tested hexagonal duct using Re as the controlling parameter. (author)

• OSTI ID: 21350387
• Journal Information: Experimental Thermal and Fluid Science, Vol. 34, Issue 8; Other Information: Elsevier Ltd. All rights reserved; ISSN 0894-1777
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
HEAT TRANSFER
DUCTS
EXPERIMENTAL DATA
PRESSURE DROP
REYNOLDS NUMBER
SURFACES
NUSSELT NUMBER
CONFIGURATION
DISTRIBUTION
PERFORMANCE
WALLS
AUGMENTATION
CORRELATIONS
HEAT EXCHANGERS
COMPARATIVE EVALUATIONS
Surface dimples