The density gradient of molecules flowing along a tube

摘要: Measurements have been made of the density gradient along four capillary tubes over a wide range input pressures. It is shown that Zugenmaier’s predictions for in exit plane are closest to experiment at low pressures when tube linear. The entrance has not predicted satisfactorily by any theory with which comparison possible. At higher pressures, such mean free path l less than diameter D, normalized independent pressure but it proportional it. these exhibits curvature (D/l)1/4 direction initial reduction There appear be no theoretical dependence quantities.