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多孔介质期刊
影响因子: 1.49 5年影响因子: 1.159 SJR: 0.43 SNIP: 0.671 CiteScore™: 1.58

ISSN 打印: 1091-028X
ISSN 在线: 1934-0508

多孔介质期刊

DOI: 10.1615/JPorMedia.v18.i9.30
pages 861-872

STUDIES ON PERMEABILITY PROPERTIES AND PARTICLE CAPTURE EFFICIENCIES OF POROUS SiC CERAMICS PROCESSED BY OXIDE BONDING TECHNIQUE

Atanu Dey
Non-Oxide Ceramic Composite Division, Central Glass and Ceramic Research Institute, CSIR, Kolkata-700 032, West Bengal, India
Nijhuma Kayal
Non-Oxide Ceramic Composite Division, Central Glass and Ceramic Research Institute, CSIR, Kolkata-700 032, West Bengal, India
Omprakash Chakrabarti
Non-Oxide Ceramic Composite Division, Central Glass and Ceramic Research Institute, CSIR, Kolkata-700 032, West Bengal, India
Rafael F. Caldato
Course of Chemical Engineering, University of Ribeirao Preto (UNAERP), 14096-900 Ribeirao Preto, SP, Brazil
Caio M. Andre
Course of Chemical Engineering, University of Ribeirao Preto (UNAERP), 14096-900 Ribeirao Preto, SP, Brazil
Murilo D. M. Innocentini
Course of Chemical Engineering, University of Ribeirao Preto (UNAERP), 14096-900 Ribeirao Preto, SP, Brazil
Vadila G. Guerra
Department of Chemical Engineering, Federal University of Sao Carlos (UFSCar), 13565-905 Sao Carlos, SP, Brazil

ABSTRACT

Porous SiC ceramics bonded with mullite [MBS of fractional porosity (ε) of 0.29-0.56, average pore size (dpore) of 5-11 μm, flexural strength (σ) of 9-34 MPa, and elastic modulus (E) of 7-28 GPa] and cordierite (CBS with ε of 0.33-0.72, dpore of 6-50 μm,  σ of 5-54 MPa, and E of 6-42 GPa) were prepared by heating in air at 1350-1500°C compacts of desired amounts of SiC, Al2O3, and MgO powders and petroleum coke dust as the pore former. Air permeation behavior of well-characterized samples was studied with fluid superficial velocity (νs) from 0.08 to 1.0 m s−1 and at RT to 750°C. The Darcian (k1) and non-Darcian (k2) permeability coefficients were evaluated by fitting the Forchheimer's equation to experimental pressure drop-superficial velocity data. Porosity dependence of permeability coefficients was explained in terms of structural characteristics. Changes in pressure drop experienced by the porous ceramics at high temperatures were explained by temperature dependence of permeability coefficients and variation of fluid properties. Collection efficiency (Eoverall) of filter ceramics operating on removal of solid NaCl nanoaerosol particles (of 7-300 nm size) was determined from particle counts before and after filtration at νs = 0.05-0.10 m s−1. Experimental results showed variation of Eoverall from 96.7 to 99.9% for change of ε from 0.56 to 0.68. The size-selective fractional collection efficiency at different porosity levels was derived using the well-known single-collector efficiency model considering some boundary conditions and the model data were validated with experimental results. The test results were used to examine the applicability of the filter ceramics in nanoparticle aerosol filtration processes.


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