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Abstract
The rib enhancement of heat transfer in a duct is studied numerically and experimentally, where hot air passes through a duct (0.04 x 0.16 x 1.15 m3) with different rib arrangement. The arranments are lower 12-rib arrangement; upper 12 rib arrangement and 24 rib staggered arrangement. The staggered arrangement gives better performance than the others. Also, the angle of attack was studied for lower arrangement, three different values were tested (45°, 60° and 90°). Angle of 60° gives better performance. Numerically, the three-dimension continuity, Navier-Stokes and energy by finite volume method of flow of air through (0.04 x 0.16 x 0.6 m3). Validation of the code was performed by comparing the numerical result with the results obtained experimentally for staggered arrangement only. The agreement seems acceptable. The numerical studies were extended to study the case of cold air passing through hot ribbed duct.
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References
- Chang, S.W., Su, L.M. and Yang, T.L., 2004, "Heat Transfer in a Swinging Rectangular Duct with two Opposite Walls Roughened by 45º Staggered Ribs," Int . J. of Heat and Mass Transfer , Vol. 44(11), pp. 287-305.
- Gao, X. and Sunden, B., 2001, "Heat Transfer and Pressure Drop Measurements in Rib-roughened Rectangular Ducts," Experimental Thermal and Fluid Science , Vol. 24(1-2), pp. 25-34.
- Han, J.C., 1988, "Heat Transfer and Friction Characteristics in Rectangular Channels with Ribs Turbulators," J. Heat Transfer , Vol. 110. pp. 321-328.
- Hadhrami, L. A. and Chin Han, J.C., 2003, "Effect of Rotation on Heat Transfer in Two-pass Square
- Channels with Five Different Orientations of 45o Angle Rib Turbulator," Int. J. of Heat and Mass Transfer , Vol. 46(4), pp. 653-669.
- Kim, K. and Kim, S., 2001, "Numerical Optimization of Rib Shape to Enhance Turbulent Heat Transfer,"
- Proceedings of the 2nd Int. Conference on Computational Heat and Mass Transfer.
- Lee, C.K. and Moneim, S.A., 2001, "Computational Analysis of Heat Transfer in Turbulent Flow Past a
- Horizontal Surface with Two - Dimensional Ribs," Int. Communications in Heat and Mass Transfer , Vol. 28(2), pp. 161-170.
- Onbasioglu, S. U. and Huseyin Onba, H., 2004, "On Enhancement of Heat Transfer with Ribs," Applied
- Thermal Engineering , Vol. 24(1), pp. 43-57.
- Patanker, S. V., 1980, Numerical Heat Transfer and Fluid Flow, McGraw-Hill, New York.
- Raisee, M. and Bolhasani, M.R., 2003, "Computation of Turbulent Flow and Heat Transfer in Passages with Attached and Detached Rib Array," Dept. of Mech. Engi., Faculty of Engineering, University of Tehran.
- Taslim, M. E., Li, T. and Spring, S. D., 1998, "Measurements of Heat Transfer Coefficient and Friction Factors in Passages Rib-Roughened on All Walls," Transactions of ASME, Vol.120, pp. 564-570.
- Tanda, G., 2004, "Heat Transfer in Rectangular Channels with Transverse and V-Shaped Broken Ribs," Int. J. of Heat and Mass Transfer , Vol. 47(2), pp. 229-243.
References
Chang, S.W., Su, L.M. and Yang, T.L., 2004, "Heat Transfer in a Swinging Rectangular Duct with two Opposite Walls Roughened by 45º Staggered Ribs," Int . J. of Heat and Mass Transfer , Vol. 44(11), pp. 287-305.
Gao, X. and Sunden, B., 2001, "Heat Transfer and Pressure Drop Measurements in Rib-roughened Rectangular Ducts," Experimental Thermal and Fluid Science , Vol. 24(1-2), pp. 25-34.
Han, J.C., 1988, "Heat Transfer and Friction Characteristics in Rectangular Channels with Ribs Turbulators," J. Heat Transfer , Vol. 110. pp. 321-328.
Hadhrami, L. A. and Chin Han, J.C., 2003, "Effect of Rotation on Heat Transfer in Two-pass Square
Channels with Five Different Orientations of 45o Angle Rib Turbulator," Int. J. of Heat and Mass Transfer , Vol. 46(4), pp. 653-669.
Kim, K. and Kim, S., 2001, "Numerical Optimization of Rib Shape to Enhance Turbulent Heat Transfer,"
Proceedings of the 2nd Int. Conference on Computational Heat and Mass Transfer.
Lee, C.K. and Moneim, S.A., 2001, "Computational Analysis of Heat Transfer in Turbulent Flow Past a
Horizontal Surface with Two - Dimensional Ribs," Int. Communications in Heat and Mass Transfer , Vol. 28(2), pp. 161-170.
Onbasioglu, S. U. and Huseyin Onba, H., 2004, "On Enhancement of Heat Transfer with Ribs," Applied
Thermal Engineering , Vol. 24(1), pp. 43-57.
Patanker, S. V., 1980, Numerical Heat Transfer and Fluid Flow, McGraw-Hill, New York.
Raisee, M. and Bolhasani, M.R., 2003, "Computation of Turbulent Flow and Heat Transfer in Passages with Attached and Detached Rib Array," Dept. of Mech. Engi., Faculty of Engineering, University of Tehran.
Taslim, M. E., Li, T. and Spring, S. D., 1998, "Measurements of Heat Transfer Coefficient and Friction Factors in Passages Rib-Roughened on All Walls," Transactions of ASME, Vol.120, pp. 564-570.
Tanda, G., 2004, "Heat Transfer in Rectangular Channels with Transverse and V-Shaped Broken Ribs," Int. J. of Heat and Mass Transfer , Vol. 47(2), pp. 229-243.