... Chemical Engineering Science, 52, (1997), 861 – 911 [5] Levenspiel, O., Modeling in chemical engineering, Chemical Engineering Science, 57, (2002), 4691 – 4696 Mass Transfer in Chemical Engineering ... (3) Mass Transfer in Chemical Engineering Processes 90such that gsUis the relative velocity between the phases given by gsgsUUU. ... (transfer of kinetic energy) between the gas and solid phases. Mass Transfer in Chemical Engineering Processes 92The diffusion coefficient for the solid phase energy fluctuation given by Gidaspow...