The Experts below are selected from a list of 210 Experts worldwide ranked by ideXlab platform
Pablo M. Carrica - One of the best experts on this subject based on the ideXlab platform.
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an approach to couple velocity pressure void fraction in two phase flows with Incompressible Liquid and compressible bubbles
International Journal of Multiphase Flow, 2018Co-Authors: Pablo M. CarricaAbstract:Abstract A numerical approach to incorporate the compressibility of bubbles to a two-phase solver with Incompressible Liquid is presented. The scheme introduces a bubble mass density equation and the ideal gas law (though other thermodynamic relations can also be used) to compute the void fraction for use in the continuous phase equations. Pressure and velocity are strongly coupled on a collocated grid scheme by obtaining face velocities through nonlinear interpolation from nodal values using an algebraic equation. Tight coupling is achieved for pressure and void fraction by careful treatment of the bubble transport and compressibility terms in the resulting pressure Poisson equation. The novel proposed implicit strategy prevents numerical instabilities even at high void fractions and highly compressible bubbles. In addition, the proposed method can capture acoustic waves for void fractions between 0.1% and 90% with errors in speed of sound of less than 2% respect to the speed of sound of isothermal compressible bubbles and water mixtures. 1D, 2D and 3D numerical tests, including the bubbly flow around a surface ship, are performed to demonstrate robustness and range of applications of the proposed scheme. The approach is shown to be stable at high void fractions when other schemes fail.
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An approach to couple velocity/pressure/void fraction in two-phase flows with Incompressible Liquid and compressible bubbles
International Journal of Multiphase Flow, 2018Co-Authors: Pablo M. CarricaAbstract:Abstract A numerical approach to incorporate the compressibility of bubbles to a two-phase solver with Incompressible Liquid is presented. The scheme introduces a bubble mass density equation and the ideal gas law (though other thermodynamic relations can also be used) to compute the void fraction for use in the continuous phase equations. Pressure and velocity are strongly coupled on a collocated grid scheme by obtaining face velocities through nonlinear interpolation from nodal values using an algebraic equation. Tight coupling is achieved for pressure and void fraction by careful treatment of the bubble transport and compressibility terms in the resulting pressure Poisson equation. The novel proposed implicit strategy prevents numerical instabilities even at high void fractions and highly compressible bubbles. In addition, the proposed method can capture acoustic waves for void fractions between 0.1% and 90% with errors in speed of sound of less than 2% respect to the speed of sound of isothermal compressible bubbles and water mixtures. 1D, 2D and 3D numerical tests, including the bubbly flow around a surface ship, are performed to demonstrate robustness and range of applications of the proposed scheme. The approach is shown to be stable at high void fractions when other schemes fail.
V A Solonnikov - One of the best experts on this subject based on the ideXlab platform.
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On the nonstationary motion of a viscous Incompressible Liquid over a rotating ball
Journal of Mathematical Sciences, 2009Co-Authors: V A SolonnikovAbstract:We consider the free boundary problem for the Navier–Stokes equations governing a nonstationary motion of a layer of a viscous Incompressible Liquid that covers the surface of a rigid ball rotating around a fixed axis with constant angular velocity ω. The Liquid is subject to the gravitation force generated by the mass of the ball. The self-gravitation forces between the Liquid particles and capillary forces on the free surface are not taken into account. We consider the problem of stability of the regime of the rigid rotation of the Liquid with the same angular velocity and prove that it is stable if |ω| is less than a certain constant. Bibliography: 10 titles.
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Instability of axially symmetric equilibrium figures of a rotating, viscous, Incompressible Liquid
Journal of Mathematical Sciences, 2006Co-Authors: V A SolonnikovAbstract:We prove that axially symmetric equilibrium figures of a uniformly rotating, viscous, Incompressible Liquid are unstable if the second variation of the energy functional takes negative values. Biblipgraphy: 14 titles.
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on instability of equilibrium figures of rotating viscous Incompressible Liquid
Journal of Mathematical Sciences, 2005Co-Authors: V A SolonnikovAbstract:We prove that non-axially symmetric equilibrium figures of uniformly rotating viscous Incompressible Liquid are unstable when the second variation of the energy functional can take negative values. Bibliography: 8 titles.
Tetsuyou Watanabe - One of the best experts on this subject based on the ideXlab platform.
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Incompressible Liquid based force sensible silicone retractor attachable to surgical suction instruments
International Conference on Advanced Intelligent Mechatronics, 2016Co-Authors: Toshio Koyama, Takeshi Yoneyama, Mitsutoshi Nakada, Tetsuyou WatanabeAbstract:This paper presents a silicone retractor, which is a continuation and extension of a previously developed system that had the same three functions as the old version: 1) retracting, 2) suction, and 3) force sensing. These features make the retractor a safe choice for use in neurosurgery. Suction is achieved by attaching the retractor to a suction pipe. The retractor has a deformation area filled with an Incompressible Liquid that is displaced in proportion to the extent of deformation; fiberscopes or human eyes detecting the displacement get a visual representation of the force. The new design improves on the old one in three ways — miniaturization, made possible by the Incompressible-Liquid-based mechanism, and measurement of force distribution by distribution of the areas deformed by force. The system was validated by conducting experiments.
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AIM - Incompressible Liquid based force sensible silicone retractor attachable to surgical suction instruments
2016 IEEE International Conference on Advanced Intelligent Mechatronics (AIM), 2016Co-Authors: Toshio Koyama, Takeshi Yoneyama, Mitsutoshi Nakada, Tetsuyou WatanabeAbstract:This paper presents a silicone retractor, which is a continuation and extension of a previously developed system that had the same three functions as the old version: 1) retracting, 2) suction, and 3) force sensing. These features make the retractor a safe choice for use in neurosurgery. Suction is achieved by attaching the retractor to a suction pipe. The retractor has a deformation area filled with an Incompressible Liquid that is displaced in proportion to the extent of deformation; fiberscopes or human eyes detecting the displacement get a visual representation of the force. The new design improves on the old one in three ways — miniaturization, made possible by the Incompressible-Liquid-based mechanism, and measurement of force distribution by distribution of the areas deformed by force. The system was validated by conducting experiments.
Vadim M. Apalkov - One of the best experts on this subject based on the ideXlab platform.
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Spin transitions in an Incompressible Liquid Coulomb-coupled to a quantum dot
Physical Review B, 2006Co-Authors: Vadim M. Apalkov, Tapash Chakraborty, Christian SchüllerAbstract:We report on our investigation of the low- lying energy spectra and charge density of a two-dimensional quantum Hall Liquid at v=2/5 that is Coulomb-coupled to a quantum dot. The dot contains a hole and two/three electrons. We found that any external perturbation caused by the close proximity of the quantum dot locally changes the spin polarization of the Incompressible Liquid. The effect depends crucially on the separation distance of the quantum dot from the electron plane. Electron density distribution in the quantum Hall layer indicates creation of a quasihole that is localized by the close proximity of the quantum dot. Manifestation of this effect in the photoluminescence spectroscopy is also discussed.
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Optical probing of a fractionally charged quasihole in an Incompressible Liquid.
Physical review letters, 2003Co-Authors: Christian Schüller, K.-b. Broocks, Patrick Schröter, Christian Heyn, Detlef Heitmann, Max Bichler, Werner Wegscheider, Tapash Chakraborty, Vadim M. ApalkovAbstract:In photoluminescence spectroscopy of a low-mobility two-dimensional electron gas subjected to a quantizing magnetic field, we observe an anomaly around nu= (1/3) at a very low temperature (0.1 K) and an intermediate electron density (0.9×1011 cm–2). The anomaly is explained as due to perturbation of the Incompressible Liquid at the Laughlin state due to close proximity of a localized charged exciton which creates a fractionally charged quasihole in the Liquid. The anomaly of ~2 meV can be destroyed by applying a small thermal energy of ~0.2 meV that is enough to close the quasihole energy gap.
Toshio Koyama - One of the best experts on this subject based on the ideXlab platform.
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Incompressible Liquid based force sensible silicone retractor attachable to surgical suction instruments
International Conference on Advanced Intelligent Mechatronics, 2016Co-Authors: Toshio Koyama, Takeshi Yoneyama, Mitsutoshi Nakada, Tetsuyou WatanabeAbstract:This paper presents a silicone retractor, which is a continuation and extension of a previously developed system that had the same three functions as the old version: 1) retracting, 2) suction, and 3) force sensing. These features make the retractor a safe choice for use in neurosurgery. Suction is achieved by attaching the retractor to a suction pipe. The retractor has a deformation area filled with an Incompressible Liquid that is displaced in proportion to the extent of deformation; fiberscopes or human eyes detecting the displacement get a visual representation of the force. The new design improves on the old one in three ways — miniaturization, made possible by the Incompressible-Liquid-based mechanism, and measurement of force distribution by distribution of the areas deformed by force. The system was validated by conducting experiments.
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AIM - Incompressible Liquid based force sensible silicone retractor attachable to surgical suction instruments
2016 IEEE International Conference on Advanced Intelligent Mechatronics (AIM), 2016Co-Authors: Toshio Koyama, Takeshi Yoneyama, Mitsutoshi Nakada, Tetsuyou WatanabeAbstract:This paper presents a silicone retractor, which is a continuation and extension of a previously developed system that had the same three functions as the old version: 1) retracting, 2) suction, and 3) force sensing. These features make the retractor a safe choice for use in neurosurgery. Suction is achieved by attaching the retractor to a suction pipe. The retractor has a deformation area filled with an Incompressible Liquid that is displaced in proportion to the extent of deformation; fiberscopes or human eyes detecting the displacement get a visual representation of the force. The new design improves on the old one in three ways — miniaturization, made possible by the Incompressible-Liquid-based mechanism, and measurement of force distribution by distribution of the areas deformed by force. The system was validated by conducting experiments.
