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]
Issue Section:
Forced Convection
1.
Acharya
, S.
, Myrum
, T.
, and Inamdar
, S.
, 1991
, “The Effect of Subharmonic Flow Pulsation in a Ribbed Pipe: Flow Visualization and Pressure Measurements
,” AIAA J.
, 29
, No. 9
, pp. 1390
–1400
.2.
Sparrow
, E. M.
, and Tao
, W. Q.
, 1983
, “Enhanced Heat Transfer in a Flat Rectangular Duct With Streamwise-Periodic Disturbances at One Principal Wall
,” ASME J. Heat Transfer
, 105
, pp. 851
–861
.3.
Han
, J. C.
, and Zhang
, P.
, 1991
, “Effect of Rib-Angle Orientation on Local Mass Transfer Distribution in a Three-Pass Rib-Roughened Channel
,” ASME J. Turbomach.
, 113
, pp. 123
–130
.4.
Liou
, T. M.
, and Hwang
, J. J.
, 1992
, “Developing Heat Transfer and Friction in Periodic Fully Developed Channel Flows
,” ASME J. Heat Transfer
, 114
, pp. 56
–64
.5.
Liou
, T. M.
, and Hwang
, J. J.
, 1992
, “Turbulent Heat Transfer Augmentation and Friction in a Ribbed Rectangular Duct With Flow Separation at the Inlet
,” ASME J. Heat Transfer
, 114
, pp. 565
–573
.6.
Acharya
, S.
, Dutta
, S.
, Myrum
, T.
, and Baker
, R. S.
, 1993
, “Periodically Developed Flow and Heat Transfer in a Ribbed Duct
,” Int. J. Heat Mass Transf.
, 36
, No. 8
, pp. 2069
–2082
.1.
Acharya, S., Myrum, T., Sinha, S., and Qiu, X., 1995, “Developing and Periodically Developed Flow, Temperature and Heat Transfer in a Ribbed Duct,” ASME/JSME Thermal Eng. Conf., Vol. 1, Mar. 1995, Maui, pp. 303–312;
2.
Int. J. Heat Mass Transf., 40, No. 2, pp. 461–480.
1.
Acharya, S., Myrum, T. A., and Dutta, S., 1995, “Heat Transfer in Turbulent Flow Past a Surface Mounted Two-dimensional Rib,” ASME Int. Mech. Eng. Conf. and Expo., San Francisco, Nov.
2.
Humphrey, J. A. C., and Whitelaw, J. H., 1979, “Turbulent Flow in a Duct With Roughness,” Turbulent Shear Flows 2, Bradbury et al., eds., Berlin, Springer-Verlag, pp. 174–188.
3.
Liou
, T. M.
, Chang
, Y.
, and Hwang
, D. W.
, 1990
, “Experimental and Computational Study of Turbulent Flows in a Channel With Two Pairs of Turbulence Promoters in Tandem
,” ASME J. Fluids Eng.
, 112
, pp. 302
–310
.4.
Kamiadakis
, George E.
, Mikic
, Bora B.
, and Patera
, A. T.
, 1988
, “Minimum-Dissipation Transport Enhancement by Flow Destabilization: Reynolds’ Analogy Revisited
,” J. Fluid Mech.
, 192
, pp. 365
–391
.5.
Acharya
, S.
, Dutta
, S.
, Myrum
, T.
, and Baker
, R. S.
, 1994
, “Turbulent Flow Past a Surface Mounted Rib
,” ASME J. Fluids Eng.
, 116
, No. 2
, pp. 238
–246
.6.
Myrum
, T. A.
, Acharya
, S.
, Inamdar
, S.
, and Mehrotra
, A.
, 1992
, “Vortex Generator Induced Heat Transfer Augmentation Past a Rib in a Heated Duct Air Flow
,” ASME J. Heat Transfer
, 114
, pp. 280
–284
.7.
Myrum
, T. A.
, Qiu
, X.
, and Acharya
, S.
, 1993
, “Heat Transfer Enhancement in a Ribbed Duct Using Vortex Generators
,” Int. J. Heat Mass Transf.
, 36
, No. 14
, pp. 3497
–3508
.8.
Myrum
, T. A.
, Acharya
, S.
, Sinha
, S.
, and Qiu
, X.
, 1996
, “The Effect of Placing Vortex Generators Above Ribs in Ribbed Ducts on the Flow, Flow-Temperature and Heat Transfer Behavior
,” ASME J. Heat Transfer
, 118
, pp. 294
–300
.9.
Myrum, T. A., and Acharya, S., 1994, “Enhanced Heat Transfer in Ribbed Ducts Using Vortex Generators,” Final Report, GRI-94/0256.
10.
Hibbs, R., Acharya, S., Chen, Y., Nikitopoulos, D., and Myrum, T., 1996, “Heat Transfer in a Two-Pass Internally Ribbed Turbine Blade Coolant Channel With Cylindrical Vortex Generators,” ASME-International Mechanical Engineering Congress and Exposition (IMECE), Atlanta, Nov.
11.
Stearns, R. F., Johnson, R. R., Jackson, R. M., and Larson, C. A., 1951, Flow Measurement With Orifice Meters, van Nostrand, Toronto.
12.
Miller, R. W., 1989, Flow Measurement Engineering Handbook, 2nd ed., McGraw-Hill, New York.
13.
Sogin
, H. H.
, and Providence
, R. I.
, 1958
, “Sublimation From Disks to Air Streams Flowing Normal to Their Surfaces
,” Trans. ASME
, 80
, pp. 61
–69
.14.
McAdams, W., 1954, Heat Transmission, 3rd ed., McGraw-Hill, New York.
15.
Kline
, S. J.
, and McClintock
, F. A.
, 1953
, “Describing Uncertainties in Single-Sample Experiments
,” Mech. Eng. (Am. Soc. Mech. Eng.)
, 75
, No. 1
, pp. 3
–8
.16.
Han
, J. C.
, Chandra
, P. R.
, and Lau
, S. C.
, 1988
, “Local Heat/Mass Transfer Distributions Around 180° turns in Two-pass Smooth and Rib-Roughened Channel
,” ASME J. Heat Transfer
, 110
, pp. 91
–98
.Copyright © 2000
by ASME
You do not currently have access to this content.
