Numerical Simulation of Conjugated Heat Transfer Characteristics of Laminar Air Flows in Parallel-Plate Dimpled Channels
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.
[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
[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
@article{"International Journal of Mechanical, Industrial and Aerospace Sciences:57133", author = "Hossein Shokouhmand and Mohammad A. Esmaeili and Koohyar Vahidkhah", title = "Numerical Simulation of Conjugated Heat Transfer Characteristics of Laminar Air Flows in Parallel-Plate Dimpled Channels", 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.", volume = "5", number = "1", pages = "130-8", }
