Two-phase flow pressure loss through packed particle bed for wide void fraction range

Numerical and experimental studies of gas–liquid flow and pressure drop in multiphase pump valves

“…The direct reason is that the gas-liquid two-phase density and viscosity decrease obviously with the increase of the gas content. Similar to the pressure characteristics of the conventional pipelines and local fittings, 26,27 the pressure drops of the three valves increase quadratically with the increase of the inlet flow rate; that is, the sudden throttling of the narrow valve clearance and the irregular flow path of the main cavity result in a large amount of the energy loss of the twophase flow, which is more obvious as the initial flow velocity increases. The two-phase pressure drop decreases approximately exponentially during the opening process of the valves.…”

Influence of hydraulic and geometric conditions on the early stages of the filtration process in idealised granular soils comprising spherical particles

“…(C) Comparison of hydraulic conductivity obtained from numerical results with closed‐form empirical solutions. (D) Comparison of characteristic hydraulic conductivity $$K^*$$ (Equation 15) obtained from numerical results with experimental results 42–44 . CFD, Computational Fluid Dynamics; FC, flow condition.…”

“…Moreover, the inherent inaccuracy of hydraulic conductivity predictions based on empirical estimates has been widely observed in macro‐scale experimental 48,50 and micro‐scale numerical 52,53 studies. The numerical results are compared with experimental data from previous studies 42–44 in Figure 8D. Intrinsic permeability, k , was measured for quasi‐monodisperse sphere packings with particle diameter ranging from 0.3 to 1.2 cm in the experimental studies listed in Table 4, and is converted to hydraulic conductivity K : $$$$\begin{equation} K = \dfrac{k \rho _f \mathbf {g}}{\mu _f} \end{equation}$$$$As the porosity of the experimental assemblies are generally lower than the filter layers of the numerical assemblies as given in Table 2, a direct comparison of K cannot be made.…”

“…This higher infiltrating particle velocity associated with the lower drag force is due to the higher susceptibility of base particles to transport through the larger 15) obtained from numerical results with experimental results. [42][43][44] CFD, Computational Fluid Dynamics; FC, flow condition.…”