Recently a new experimental set-up for measuring the directional spectral emittance has been developed. Both sides of packed opaque spheres are simultaneously heated with identical power laser beams (CO2 10.6 μm) and the isothermal condition in the medium is assumed. In this paper we consider the coupled conduction-radiation equations to investigate the effect of the temperature nonuniformity on the calculated value of the emittance and to verify if the isothermal assumption is valid. Moreover, the sensitivity of the emittance and the temperature profile to the values of parameters (such as the porosity, the face temperatures, and the particle hemispherical reflectivity, etc.) is studied.

Issue Section:
Porous Media
Keywords:
radiative transfer, heat radiation, Heat Transfer, High Temperature, Modeling, Packed Beds, Participating Media, Porous Media, Properties, Radiation
Topics:
Heat conduction, Heat transfer, Particulate matter, Radiation (Physics), Temperature, Temperature gradient, Reflectance, Porosity
1.
Viskanta
,
R.
, and
Mengu¨c¸
,
M. P.
,
1989
, “
Radiative Transfer in Dispersed Media
,”
ASME Appl. Mech. Rev.
,
42
(
9
), pp.
241
–
259
.
2.
Baillis
,
D.
, and
Sacadura
,
J. F.
,
2000
, “
Thermal Radiation Properties of Dispersed Media: Theoretical Prediction and Experimental Characterization
,”
J. Quant. Spectrosc. Radiat. Transf.
,
67
, pp.
327
–
363
.
3.
Kaviany, M., 1995, Principles of Heat Transfert in Porous Media, 2nd ed., Springer-Verlag.
4.
Kamiuto
,
K.
,
1990
, “
Correlated Radiative Transfer in Packed-Sphere Systems
,”
J. Quant. Spectrosc. Radiat. Transf.
,
43
(
1
), pp.
39
–
43
.
5.
Singh
,
B. P.
, and
Kaviany
,
M.
,
1992
, “
Modeling Radiative Heat Transfer in Packed Beds
,”
Int. J. Heat Mass Transf.
35
(
6
), pp.
1397
–
1405
.
6.
Jones
,
P. D.
,
McLeod
,
D. G.
, and
Dorai-Raj
,
D. E.
,
1996
, “
Correlation of Measured and Computed Radiation Intensity Exiting a Packed Bed
,”
J. Heat Transfer
,
118
, pp.
94
–
102
.
7.
Lopes
,
R.
,
Moura
,
L. M.
,
Baillis
,
D.
, and
Sacadura
,
J. F.
,
2001
, “
Directional Spectral Emittance of a Packed Bed: Correlation Between Theoretical Prediction and Experimental Data
,”
J. Heat Transfer
,
123
(
2
), pp.
205
–
416
.
8.
Lopes, R., Moura, L. M., Delmas, A., and Sacadura, J.-F., 1998, “Directional Spectral Emittance of Ceramic Material: Theoretical Prediction Compared to Experimental Data,” 7th AIAA/ASME Joint Thermophysics and Heat Transfer Conference, Albuquerque, New Mexico.
9.
Doermann, D., 1995, “Mode´lisation des transferts thermiques dans des mate´riaux semi-transparents de type mousse a` pores ouverts et pre´diction des proprie´te´s radiatives,” Ph.D. thesis, n° 95 ISAL. 0010, INSA de Lyon, France.
10.
Nicolau, V. P., 1994, “Identification des proprie´te´s radiatives des mate´riaux semi-transparents diffusants,” Ph.D. thesis, n° 94 ISAL. 0001, INSA de Lyon, France.
11.
Brewster, M. Q., 1992, Thermal Radiative Transfer and Properties, John Wiley and Sons, New York, Inc., pp. 301–336.
Copyright © 2002
 by ASME
You do not currently have access to this content.