Pg, Pl O pressure drop due to liquid holdup pressure drop due to acceleration of liquid total pressure drop Reynolds number = DUgpg/jxg Reynolds number = DUlpl//xl superficial gas velocity based on empty pipe superficial liquid velocity based on empty pipe actual meangas velocity actual mean liquid velocity rate of energy dissipation due to wall friction per unit cross-section area of pipe measured length pipe length correction factor viscosity of gas and liquid density of gas and liquid

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... tension liquid holdup ( Subscript) TP = two-phase Pa] [Pa] [Pa] [-] H [m/s] [m/s] [m/s] [m/s ] [kg/s3] [m] [m] [-] [Pa -s] [k g/ m3 ] [N/ m] [-] Literature Cited In the previous paper,1} the authors reported that the point efficiencies of a porous glass membranefor the separation of H2-COmixture could be explained reasonably by a semiempirical method based on the permeation equation proposed by Present and deBethune.2) It is preferable to employ their equation for prediction of the performance of separators made of porous membraneover a wide range of pressure. However,no application of their equation has been reported in the literature. In this paper, a calculation method for gas separators made of porous membranes is developed using