Search

Your search keyword '"Tarabara, Volodymyr V."' showing total 252 results
Start Over Author "Tarabara, Volodymyr V."
252 results on '"Tarabara, Volodymyr V."'

10. Oil droplet behavior at a pore entrance in the presence of crossflow: Implications for microfiltration of oil-water dispersions

Author

Darvishzadeh, Tohid, Tarabara, Volodymyr V., and Priezjev, Nikolai V.

Subjects
Physics - Fluid Dynamics, Condensed Matter - Soft Condensed Matter
Abstract

The behavior of an oil droplet pinned at the entrance of a micropore and subject to clossflow-induced shear is investigated numerically by solving the Navier-Stokes equation. We found that in the absence of crossflow, the critical transmembrane pressure required to force the droplet into the pore is in excellent agreement with a theoretical prediction based on the Young-Laplace equation. With increasing shear rate, the critical pressure of permeation increases, and at sufficiently high shear rates the oil droplet breaks up into two segments. The results of numerical simulations indicate that droplet breakup at the pore entrance is facilitated at lower surface tension, higher oil-to-water viscosity ratio and larger droplet size but is insensitive to the value of the contact angle. Using simple force and torque balance arguments, an estimate for the increase in critical pressure due to crossflow and the breakup capillary number is obtained and validated for different viscosity ratios, surface tension coefficients, contact angles, and drop-to-pore size ratios., Comment: 37 pages, 16 figures

Published
2013
Full Text
View/download PDF

49. Fabrication and characterization of polysulfone reinforced hollow fibre membrane.

Author

Turken, Turker, Sengur-Tasdemir, Reyhan, Urper-Bayram, Gulsum Melike, Gunes, Oguz, Ates-Genceli, Esra, Tarabara, Volodymyr V., and Koyuncu, Ismail

Subjects
HOLLOW fibers, PORE size distribution, MOLECULAR weights, SERUM albumin, PERMEABILITY, SURFACE morphology
Abstract

In this study, reinforced hollow fibre membranes were fabricated using different molecular weights of polyvinylidene prolidone (PVP Mw: 10, 40 and 360 kDa) and different take-up speeds (1, 2, 2.6 and 3.5 m/min). Prepared reinforced hollow fibre membranes were characterized in terms of permeability; surface morphology and hydrophilicity; pore size distribution; bovine serum albumin (BSA) rejection and flux recovery ratio. Optimum permeability and BSA rejection were obtained when PVP molecular weight was 40 kDa. After PVP molecular weight determination, advancing speed was changed and it was seen that increasing advancing speed ended up with decreased membrane wall thickness; however, decreased wall thickness increased the probability of irreversible fouling. [ABSTRACT FROM AUTHOR]

Published
2021
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results