56 citations · 177 across the 7 of their papers we have counts for
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Modeling of high-pressure transient gas-liquid flow in M-shaped jumpers of subsea gas production systems
Alexander Yurishchev, Neima Brauner, Amos Ullmann
Two-phase flow with low liquid loads is common in high-pressure natural gas offshore gathering and transmission pipelines. During gas production slowdowns or shutdowns, an accumula…
Transient gas-liquid flow phenomena in M-shaped jumper of subsea gas production systems during start-up operation
Alexander Yurishchev, Richard Benjamin Ravid, Amos Ullmann +1
Removal of the accumulated liquid from jumpers of subsea gas production systems is essential to avoid possible hydrate creation and further damage to the pipeline. However, the dis…
Non-modal stability analysis of stratified two-phase channel flows
Ilya Barmak, Alexander Gelfgat, Amos Ullmann +1
The non-modal transient growth of perturbations in horizontal and inclined channel flows of two immiscible fluids is studied. 3D perturbations are examined in order to find the opt…
Stability of stratified two-phase channel flows of Newtonian/non-Newtonian shear-thinning fluids
Davide Picchi, Ilya Barmak, Amos Ullmann +1
Linear stability of horizontal and inclined stratified channel flows of Newtonian/non-Newtonian shear-thinning fluids is investigated with respect to all wavelength perturbations.…
Characteristics of stratified flows of Newtonian/non-Newtonian shear-thinning fluids
Davide Picchi, Pietro Poesio, Amos Ullmann +1
Exact solutions for laminar stratified flows of Newtonian/non-Newtonian shear-thinning fluids in horizontal and inclined channels are presented. An iterative algorithm is proposed…
Stability of stratified two-phase flows in inclined channels
Ilya Barmak, Alexander Gelfgat, Amos Ullmann +1
Linear stability of stratified gas-liquid and liquid-liquid plane-parallel flows in inclined channels is studied with respect to all wavenumber perturbations. The main objective is…
Stability of stratified two-phase flows in horizontal channels
Ilya Barmak, Alexander Gelfgat, Helena Vitoshkin +2
Linear stability of stratified two-phase flows in horizontal channels to arbitrary wavenumber disturbances is studied. The problem is reduced to Orr-Sommerfeld equations for the st…