The effect of vortex generators on the heat transfer from internally ribbed passages is studied experimentally using a mass transfer technique. Cylindrical vortex generators placed directly above the ribs have been used in this study. Results are reported on the effect of the spacing between the vortex generator and the ribs. Detailed distributions of the Sherwood number contours and the centerline Sherwood number distributions are presented. Reynolds number values of 5000, 10,000, and 30,000 are studied and three generator-rib-spacing/rib-height (s/e) values of 0.55, 1, and 1.5 are considered. It is shown that at small generator-rib spacings (s/e=0.55), the two act as a single element, and lead to a retardation of the shear layer development past the reattachment point. This is generally associated with lower heat transfer. At a larger generator-rib spacing (s/e=1.5), the generator wake and the rib shear layer interact with each other to promote mixing and heat transfer. [S0022-1481(00)02103-4]
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Mass/Heat Transfer in a Ribbed Passage With Cylindrical Vortex Generators: The Effect of Generator-Rib Spacing
S. Acharya,
S. Acharya
Mechanical Engineering Department, Lousiana State University, Baton Rouge, LA 70803
11
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R. G. Hibbs,
R. G. Hibbs
Mechanical Engineering Department, Lousiana State University, Baton Rouge, LA 70803
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Y. Chen,
Y. Chen
Mechanical Engineering Department, Lousiana State University, Baton Rouge, LA 70803
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D. E. Nikitopoulos
D. E. Nikitopoulos
Mechanical Engineering Department, Lousiana State University, Baton Rouge, LA 70803
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S. Acharya
11
Mechanical Engineering Department, Lousiana State University, Baton Rouge, LA 70803
R. G. Hibbs
Mechanical Engineering Department, Lousiana State University, Baton Rouge, LA 70803
Y. Chen
Mechanical Engineering Department, Lousiana State University, Baton Rouge, LA 70803
D. E. Nikitopoulos
Mechanical Engineering Department, Lousiana State University, Baton Rouge, LA 70803
Contributed by the Heat Transfer Division for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received by the Heat Transfer Division, August 15, 1998; revision received, April 13, 1999. Associate Technical Editor: J. Han.
J. Heat Transfer. Nov 2000, 122(4): 641-652 (12 pages)
Published Online: April 13, 1999
Article history
Received:
August 15, 1998
Revised:
April 13, 1999
Citation
Acharya, S., Hibbs , R. G., Chen , Y., and Nikitopoulos, D. E. (April 13, 1999). "Mass/Heat Transfer in a Ribbed Passage With Cylindrical Vortex Generators: The Effect of Generator-Rib Spacing ." ASME. J. Heat Transfer. November 2000; 122(4): 641–652. https://doi.org/10.1115/1.1288026
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