The Effective Thermal Conductivity (ETC) of Spherical Packed-Bed Porous Media for Modification of the Color Surface as Black Color

Abstract:

The effective thermal conductivity (ETC) of the spherical packed-bed porous media in stagnant fluid case is estimated by modifying the color surface of the porous media as black surface. The Alumina-Cordierite (Al-Co) ceramic balls having average diameter (d) of 5.0 cm is constructed as the porous media and, then, a porosity (f) has 0.398. For development of the porous media as black surface, the Al-Co ceramic balls are painted by black color and then it is composed of 600 °C × 8 hr. The experimental procedure to evaluate the ECT is based on ASTM E1225. A higher temperature (T_H) is investigated in the range of 400 to 800 K at the constant power of 350 W. The ETC of three surfaces of the Al-Co ceramics ball, i.e., original surface (_λorg), combined black-painted and original surface (λ_com) and black surface (λ_blk), are examined. From experiment, it is found that all ETC of three surfaces decrease with increasing T_H. The value of three ETCs are in the range of 6.2 to 27.1 W/(m K). The l_blk gives highest for the present research and, exactly, the worst case is obtained by λ_org. Thus, the ETC of spherical packed-bed porous media with stagnant fluid can be improved by developing the color surface as black color.

• Periodical: Materials Science Forum (Volume 911)
• Pages: 100-104
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.911.100
• Online since: January 2018
• Authors: Bundit Krittacom*, Pornsawan Tongbai
• Keywords: Black Color, Effective Thermal Conductivity, Packed Bed, Porous Media

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