Effect of drag models on simulation of dense-phase pneumatic conveying in horizontal pipe under high pressure

Based on the Euler-Euler model, Dartevelle friction stress model, the revised kinetic theory of granular flows, Johnson & Jackson wall boundary conditions with friction stress term and Realizable k-ε-kp-εp turbulent model were introduced to simulate dense phase pneumatic conveying the in horizontal pipe under the high pressure, and the effects of Huilin-Gidaspow drag model, Mckeen drag model and three-zone drag model this study established on the simulation results were explored. The simulation results show that, compared with the other two drag models, the result with three-zone drag model can more accurately predict, the pressure drop of the horizontal pipe and its variation with supplementary gas flow rates the relative error is from -3.7% to +5.2%, reflecting the conveying characteristics of all flow regimes in dense phase pneumatic conveying in the horizontal pipe under high pressure. The predicted solids volume fraction distribution in the cross section of the horizontal pipe also basically agrees with the electrical capacitance tomography (ECT) diagram. Results demonstate that three-zone drag model is more applicable to simulate dense phase pneumatic conveying in the horizontal pipe under high pressure. © 2020, Editorial Department of Journal of Southeast University. All right reserved.