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Highlights ► Laser-induced fluorescence has been used to visualise liquid–liquid flows. ► Eight flow regimes were observed including the positive identification of three-layer flows. ► Vertical phase distribution and in situ phase fraction studied. ► Interface level and droplet size...
Highlights ► A criterion is proposed to predict the radial gas fraction distribution in an upward bubbly pipe flow. ► Critical values of the Reynolds and Weber numbers are found for the transition from wall to core peak. ► The criterion was validated for many experimental conditions from...
Highlights ► A two-fluid model six equations is used to solve the two-phase flow inside pipes. ► The numerical resolution is based on the MCBA algorithm using a pressure based method. ► Empirical correlations are applied depending on flow regime. ► A group of benchmark cases verifies the...
Highlights ► New method to predict the void fraction in annular two-phase flow. ► Method covers macroscale and microscale tubes, circular and non-circular channels. ► Method works for adiabatic and evaporating flows. ► Large underlying experimental database (2673 points). ► Method based...
Highlights ► Four-way coupled Euler–Lagrange predictions of particle-laden flows over rough walls. ► Sandgrain roughness wall model developed for the particular phase (DNS/LES/RANS). ► New wall collision model purely relies on standard roughness parameters. ► Shadow effect leads to...
Highlights ► Thorough validation of falling film simulations against experimental data. ► With CSS, parasitic currents can distort vortex structure in the roll waves. ► Balanced CSF with height functions can handle large curvatures near capillary waves. ► Surface tension model affects...
Highlights ► We derived improved boundary conditions (BCs) for modeling rapid granular flows. ► These connect non-sliding and sliding collisions in contrast to Jenkins and Louge (1997). ► We considered the solids wall shear stresses and the flux of fluctuation energy. ► The theory is...
Highlights ► Experimental evidence of water mobility control by capillary driven mechanism. ► Existence of a critical capillary number below which mobility drops significantly. ► Estimation of critical capillary number from viscous to capillary pressure ratio. ► Evidence of efficient...
Highlights ► The critical heat flux (CHF) of flow boiling on the micro-structured Zirlo tube. ► The effect of liquid spreading due to the micro-structures on the CHF enhancement. ► The proposed possible mechanism of CHF enhancement.
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