MEASUREMENT AND CORRELATION OF VOLUMETRIC HEAT-TRANSFER COEFFICIENTS OF CELLULAR CERAMICS

The volumetric heat transfer coefficients (h(v)) between cellular cera mics and a stream of air were measured using the single-blow transient experimental technique in conjunction with an inverse analysis. Test specimen made of mullite, YZA, SiC, cordierite and cordierite with LS- 2 coating was studied. The number of pores per centimeter (PPC) ranged from 4 to 26 and the specimen thickness ranged from 6 to 12 mm. Based on the experimental data, the volumetric heat transfer coefficients w ere generalized by developing Nusselt number vs. Reynolds number corre lations of the form Nu(v) = CRem for the materials studied. The effect s of pore length-scale and specimen thickness on the volumetric heat t ransfer coefficients are presented and discussed. (C) 1998 Elsevier Sc ience Inc. All rights reserved.