caa a22 4500 465755208 CHVBK 20180323111845.0 cr unu---uuuuu 170327e19900101xx s 000 0 eng 10.1007/BF00503875 doi (NATIONALLICENCE)springer-10.1007/BF00503875 The permeability of alumina over an extended temperature range [Elektronische Daten] [W. Pulkrabek, R. Wabrek, W. Ibele] A semiempirical mathematical model has been developed to predict the permeability of porous alumina over a wide temperature range at atmospherie pressure. Although the thermal expansion of the alumina is of the order of 1 % over the range of temperatures considered, the apparent permeability of the sample to gas flow varies by over 400%. This behavior is due to the dependence of the mean free path of a gas on temperature and to the corresponding slip conditions that occur in the pores of the solid. The model developed correlates the "apparent permeability” data with temperature, true permeability, gas viscosity, and gas molecular weight, variables suggested by kinetie theory on mean free path and slip. Apparent permeability was found to be a very strong function of temperature. It exhibited both a direct thermal dependence and an indirect dependence, manifest through thermally driven variations in the gas viscosity. A mathematical model from the literature was used for gas viscosity. The inverse correlation with gas molecular weight, suggested by kinetie theory, is demonstrated. The model covers the temperature range between 250 and 1600 K. Small molelcule gases including air, nitrogen, argon, and helium were used in the development. Plenum Publishing Corporation, 1990 high-temperature gas flow nationallicence permeability nationallicence porous ceramics nationallicence slipflow nationallicence Pulkrabek W. Mechanical Engineering Department, University of Wisconsin-Platteville, 53818, Platteville, Wisconsin, USA aut Wabrek R. General Engineering Division, University of Wisconsin-Platteville, 53818, Platteville, Wisconsin, USA aut Ibele W. Heat Transfer Laboratory Mechanical Engineering Department, University of Minnesota, 55455, Minneapolis, Minnesota, USA aut International Journal of Thermophysics Kluwer Academic Publishers-Plenum Publishers 11/1(1990-01-01), 251-258 0195-928X 11:1<251 1990 11 10765 https://doi.org/10.1007/BF00503875 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00503875 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Pulkrabek W. Mechanical Engineering Department, University of Wisconsin-Platteville, 53818, Platteville, Wisconsin, USA aut NATIONALLICENCE 700 1- Wabrek R. General Engineering Division, University of Wisconsin-Platteville, 53818, Platteville, Wisconsin, USA aut NATIONALLICENCE 700 1- Ibele W. Heat Transfer Laboratory Mechanical Engineering Department, University of Minnesota, 55455, Minneapolis, Minnesota, USA aut NATIONALLICENCE 773 0- International Journal of Thermophysics Kluwer Academic Publishers-Plenum Publishers 11/1(1990-01-01), 251-258 0195-928X 11:1<251 1990 11 10765 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer