Illustration 4.6 A porous carbon diaphragm 1 in ( 25.4mm ) thick of average pore diameter 0.01 cm permitted the flow of nitrogen at the rate of 9.0ft3 (measured at 1stdatm,80F)/ft2min (0.0457m3/m2s,26.7C) with a pressure difference across the diaphragm of 2inH2O(50.8 mmH2O ). The temperature was 80F and the downstream pressure 0.1stdatm. Calculate the flow to be expected at 250F(121C) with the same pressure difference. Solurron The viscosity of nitrogen =1.8105kg/ms at 26.7C(300K). At 0.1stdatm, pt=10133N/m2MN2=28.02. Eq. (4.22)