The Ergun equation with the Richardson and Zaki correlation (ERZ) gives continuous variation of the drag coefficient over the relevant range of dispersed phase volume fractions. The modified Richardson and Zaki correlation (MRZ) was also found to give a similar continuous variation of drag coefficient. The predictions of Molerus's correlation were found to be very sensitive to the values of packing parameters at a continuous phase volume fraction of about 0.4. Either ERZ or MRZ correlations may be used to represent the influence of other particles when simulating dense gas-solid flows.

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