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Effects of Surface Radiation on the Unsteady Natural Convection in a Rectangular Enclosure
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 Title & Authors
Effects of Surface Radiation on the Unsteady Natural Convection in a Rectangular Enclosure
Baek, Seung-Wook; Kim, Taig-Young;
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 Abstract
Numerical solution of the full Navier-Stokes equation as well as the energy equation has been obtained for the unsteady natural convection in a rectangular enclosure. One side wall was maintained at very high temperature simulating fires. Especially the effect of surface radiation was taken into account. While the enclosed air was assumed to be transparent, the internal walls directly interacted one another through the surface radiation. Due to a significant temperature difference in the flow field, the equation of state was used instead of the Boussinesq approximation. It was found that the rapid heating of the adiabatic ceiling and floor by the incoming radiation from the hot wall made the evolution at thermo-fluid field highly unstable in the initial period. Therefore, the secondary cells brought about at the floor region greatly affected the heat transfer mechanism inside the enclosure. The heat transfer rate was augmented by the radiation, resulting in requiring less time for the flow to reach the steady state. At the steady state neglecting radiation two internal hydraulic jumps were clearly observed in upper/left as well as in lower/right comer. However, the hydraulic jump in the lower/right comer could not be observed for the case including radiation due to its high momentum flow over the bottom wall. Radiation resulted in a faster establishment of the steady state phenomena.
 Keywords
unsteady natural convection;surface radiation;
 Language
English
 Cited by
 References
1.
A. E. Gill, 1966, "The boundary-layer regime for convection in a rectangular cavity," J. Fluid Mech., Vol. 26, No. 3, pp. 515-536 crossref(new window)

2.
S. J. M. Linthorst, W.M.M. Schinkel, and C. J. Hoogendoorn, 1981, "Flow structure with natural convection in inclined air-filled enclosure," J. Heat Transfer, Vol. 103, pp. 535-539 crossref(new window)

3.
P.G. Simpkins and T. D. Dudderar, 1981, "Convection in rectangular cavities with differentially heated end walls," J. Heat Transfer, Vol. 110, pp. 433-456

4.
S. M. EISherbiny, K. G. T. Hollands, and G. D. Raithby, 1982, "Effect of thermal boundary layer conditions on natural convection in vertical and inclined air layer," J. Heat Transfer, Vol. 104, pp. 515-520 crossref(new window)

5.
G. D. Mallinson, 1987, "The effects of side-wall conduction on natural convection in a slot," J Heat Transfer, Vol. 109, pp. 419-526 crossref(new window)

6.
J. C. Patterson and J. Imberger, 1980, "Unsteady natural convection in a rectangular cavity," J. fluid Mech, Vol. 100, No. 1, pp. 65-86 crossref(new window)

7.
K. Kublbeck, G. P. Merker, and J. Straub, 1980, "Advanced numerical computation of two-dimensional time-dependent free convection in cavities," Int. J. Heat Mass Transfer, Vol. 23, pp. 203-217 crossref(new window)

8.
J. C. Patterson, 1984,"On the existence of an oscillatory approach to steady natural convection in cavities," J. Heat Transfer, Vol. 106, pp. 104-108 crossref(new window)

9.
G. N. Ivey, 1984, "Experiments on transient natu ral convection in a cavity," J. Fluid Mech, Vol. 144, pp. 389-401 crossref(new window)

10.
W. J. Hiller, St. Koch, T. A. Kowalewski, and F. Stella, 1993, "Onset of natural convection in a cube," Int. J. Heat Mass Transfer, Vol. 36, No. 13, pp. 3251-3263 crossref(new window)

11.
K. S.Chen,J.R.Ho,andJ.A.C.Humphrey, 1987, "Steady, two-dimensional, natural convection in rectangular enclosure with differently heated walls," J. Heat Transfer, Vol. 109, pp. 400-406 crossref(new window)

12.
J. L. Zia, M. D. Xin, and H. J. Zhang, 1990, "Natural convection in an externally heated enclosure containing a local heat source," J. Thermophysics, Vol. 4, No.2, pp, 233-238 crossref(new window)

13.
M. Hasnaoui, E. Bilgen, and P. Vasseur, 1992,"Natural convection heat transfer in rectangular cavities partially heated from below," J. Thermophysics, Vol. 6, No.2, pp. 255-264 crossref(new window)

14.
D.W. Larson and R. Viskanta, 1976,"Transient combined laminar free convection and radiation in a rectangular enclosure," J. Fluid Mech, Vol. 78, pp. 65-85 crossref(new window)

15.
H. Hilsenrath et aI., 1960, Tables of Thermodynamics and Transport Properties of Air, Argon, Carbon Dioxide. Hydrogen, Oxygen, and Steam, Pergamon Press, New York

16.
R. Siegel and J. R. Howell, 1981, Thermal Radiation Heat Transfer, McGraw-Hill, New York

17.
T. Hayase, J. A. C. Humphrey, and R. Greif, 1992, "A consistently formulated QUICK scheme for fast and stable convergence using finite-volume iterative calculation procedures," J. Comput. Phys., Vol. 98, pp. 108-118 crossref(new window)

18.
S. V. Partankar, 1980, Numerical Heat Transfer and Fluid Flow, McGraw-Hill, New York