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Numerical Simulation of Conjugated Heat Transfer Characteristics of Laminar Air Flows in Parallel-Plate Dimpled Channels

Authors: Hossein Shokouhmand , Mohammad A. Esmaeili, Koohyar Vahidkhah

Abstract:

This paper presents a numerical study on surface heat transfer characteristics of laminar air flows in parallel-plate dimpled channels. The two-dimensional numerical model is provided by commercial code FLUENT and the results are obtained for channels with symmetrically opposing hemi-cylindrical cavities onto both walls for Reynolds number ranging from 1000 to 2500. The influence of variations in relative depth of dimples (the ratio of cavity depth to the cavity curvature diameter), the number of them and the thermophysical properties of channel walls on heat transfer enhancement is studied. The results are evident for existence of an optimum value for the relative depth of dimples in which the largest wall heat flux and average Nusselt number can be achieved. In addition, the results of conjugation simulation indicate that the overall influence of the ratio of wall thermal conductivity to the one of the fluid on heat transfer rate is not much significant and can be ignored.

Keywords: cavity, conjugation, heat transfer, laminar air flow, Numerical, parallel-plate channel.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1070165

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References:


[1] Kelkar, and K. M., Patankar, S.V., 1987, "Numerical prediction of flow and heat transfer in a parallel plate channel with staggered fins", J. Heat Transfer, 109, pp. 25-30.
[2] Lazardis A., 1988, "Heat transfer correlation for flow in a parallel plate channel with staggered fins", J. Heat Transfer, 110, pp. 801-802.
[3] Cheng C.H., and Huang W.H., 1989, "Laminar forced convection flows in horizontal channels with transverse fins placed in the entrance region", Num. Heat Transfer, 16, pp. 77-100.
[4] Ghaddar, N.K., Karczak, K.Z., Mikic, B.B., and Patera, A.T., 1986, "Numerical investigation of incompressible flow in grooved channels, Part 1. Stability and self-sustained oscillations", J. Fluid Mech., 163, pp. 99-127
[5] Ghaddar, N.K., Megan, M., Mikic, B.B., and Patera, A.T., 1986, "Numerical investigation of incompressible flow in grooved channels, Part 2. Resonance and oscillatory heat-transfer enhancement", J. Fluid Mech., 168, pp. 541-567
[6] Fahanieh, B., Herman, C., and Sunden B., 1993, "Numerical and experimental analysis of laminar fluid flow and forced convection heat transfer in a grooved duct", Int. J. Heat Mass Transfer, 36, pp. 1609- 1617
[7] Moon, H. K., O -Connel, T., and Glezer, B., 2000, "Channel Height Effect on Heat Transfer and Friction in a Dimple Passage", J. Eng. Gas Turbines Power, 122, pp. 307-313.
[8] Chyu, M. K., Yu, Y., Ding, H., Downs, J. P., and Soechting, F. O., 1997, "Concavity Enhancement Heat Transfer in an Internal Cooling Passage", Proceedings IGTI, Turbo Expo, Orlando, FL, 2-5, Paper No. 97-GT-437.
[9] Ligrani, P. M., Mahmood, G. I., Harrison, J. L., Clayton, C. M., and Nelson, D. L. , 2001, "Flow Structure and Local Nusselt Number Variation in a Channel With Dimples and Protrusions on Opposite Walls", Int. J. Heat Mass Transfer, 44, pp. 4413-4425.
[10] Herman, C., and Kang, E., 2002, "Heat transfer enhancement in a grooved channel with curved vanes", Int. J. Heat Mass Transfer, 45, pp. 3741-3757
[11] Ridouane, H., and Campo, A., 2007, "Heat transfer and pressure drop characteristics of laminar air flows moving in a parallel-plate channel with transverse hemi-cylindrical cavities", Int. J. Heat Mass Transfer, 50, pp. 3913-3924
[12] Won, S.Y., and Ligrani, P.M., 2004, "Numerical predictions of flow structure and local Nusselt number ratios along and above dimpled surfaces with different dimple depths in a channel", Num. Heat Transfer, 46, pp. 549-570
[13] Park, J., Desam, P.R., and Ligrani, P.M., 2004, "Numerical predictions of flow structure above a dimpled surface in a channel", Num. Heat Transfer, 45, pp. 1-20
[14] Bilen, K., Cetin, M., Gul, H., and Balta, T., 2009, "The investigation of groove geometry effect on heat transfer for internally grooved tubes", Applied Thermal Engineering, 29, pp. 753-761
[15] Incropera, F.P., and De Witt, D.P., 1996, "Fundamentals of Heat and Mass Transfer", fourth ed., Wiley