Analysis of the heat transfer and friction in a ribbed square channel using numerical and experimental methods

Abstract

Numerical predictions and experiment of a hydrodynamic and thermally developed turbulent flow through square channels with one or two ribbed walls were performed to determine the pressure drop and heat transfer. The CFX (version 5.7) software package was used for the computations. The rough wall had 45°-inclined square ribs. All four walls in the channel were heated, and a uniform heat flux was maintained on the entire inner heat transfer channel area. Experimental data were also obtained for four Reynolds numbers ranging from 7600 to 24 900, a pitch-to-rib-height ratio of 8.0, and a rib-height-to-channel hydraulic diameter ratio of 0.0667. The numerical results were in agreement with the experimental data and showed that the values of the local heat transfer coefficient and friction factor in a square channel with two ribbed walls were greater than those with one ribbed wall.

Keywords

square duct 45°-inclined ribbed wall heat transfer pressure drop temperature contour

Get full access to this article

View all access options for this article.

References

Han

J. C.

Heat transfer and friction characteristics in rectangular channels with rib turbulators

ASME, J. Heat Transf., 1988, 110, 321–328.

Liou

T. M.

Hwang

J. J.

Chen

S. H.

Simulation and measurement of enhanced turbulent heat transfer in a channel with periodic ribs on one principal wall

Int. J. Heat Mass Transf., 1993, 36 (2), 507–517.

Han

J. C.

Park

J. S.

Developing heat transfer in rectangular channels with rib turbulators

Int. J. Heat Mass Transf., 1988, 31, 183–195.

Taslim

M.E.

Kercher

D.M.

Experimental heat transfer and friction in channels roughened with angled V-shaped and discrete ribs on two opposite walls

ASME, J. Turbomach., 1996, 118, 20–28

Kiml

Mochizuki

Murata

Effects of rib arrangements on heat transfer and flow behavior in a rectangular rib-roughened passage

ASME, J. Heat Transf., 2001, 123, 675–681.

Webb

R. L.

Eckert

E. R. G.

Goldstein

R. J.

Heat transfer and friction in tubes with repeated - rib roughness

Int. J. Heat Mass Transf., 1971, 14, 601–617.

Kline

S. J.

McClintock

F. A.

Describing uncertainties in single sample experiments

Mech. Eng., 1953, 75, 3–8.

Jones

W. P.

Launder

B. E.

The prediction of laminarization with a two-equation model of turbulence

Int. J. Heat Mass Transf., 1972, 15, 301–314.

Jones

W. P.

Launder

B. E.

The calculation of low-Reynolds-number phenomena with a two-equation model of turbulence

Int. J. Heat Mass Transf., 1973, 16, 1119–1130.

10.

Schlichting

Boundary-layer theory, 7th edition, 1979 (McGraw-Hill, Inc., New York).

11.

Patel

V. C.

Wolfgang

Scheuerer

Turbulence models for near-wall and low reynolds number flows: A review

AIAA J., 1985, 23, 1308–1319.

12.

Wilcox

Turbulence modeling for CFD, 1993 (DCW Industries, Inc., La Canada, CA).

13.

Rau

Cakan

Moeller

Arts

The effect of periodic ribs on the local aerodynamic and heat transfer performance of straight cooling channel

ASME, J. Turbomach., 1980, 120, 368–375.

14.

Tafti

D. K.

Evaluating the role of subgrid stress modeling in a ribbed duct for the internal cooling of turbines blades

Int. J. Heat Fluid Flow, 2005, 26, 92–104.

15.

Incropera

F. P.

Dewitt

D. P.

Fundamentals of heat and mass transfer, 5th edition, 2002 (John Wiley and Sons, New York).

16.

Kays

W. M.

Crawford

M. E.

Convective heat and mass transfer, 2nd edition, 1980 (McGraw-Hill, New York).