PREDICTION OF PRESSURE-DROP AND LIQUID HOLDUP IN HIGH-PRESSURE TRICKLE-BED REACTORS

The Holub et al. (1992, 1993) phenomenological model for pressure drop and liquid holdup in trickle flow regime at atmospheric pressure was noted by Al-Dahhan and Dudukovic (1994) to systematically underpredict pressure drop at high pressure and high gas flow rates. In this study , the Holub et al. (1992, 1993) model has been extended to account for the interaction between the gas and liquid phases by incorporating th e velocity and the shear slip factors between the phases. As a result, the prediction of pressure drop at the operating conditions of indust rial interest (high pressure) has been improved noticeably without any significant loss in predictability of liquid holdup. The extended mod el and the comparison between its prediction and experimental high pre ssure and high gas flow rate data are presented and discussed.