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Santosh Ansumali - One of the best experts on this subject based on the ideXlab platform.

  • higher order galilean invariant lattice boltzmann model for microflows single Component Gas
    Physical Review E, 2010
    Co-Authors: Wahyu Perdana Yudistiawa, Sang Kyu Kwak, Dhiraj V Patil, Santosh Ansumali
    Abstract:

    We introduce a scheme which gives rise to additional degree of freedom for the same number of discrete velocities in the context of the lattice Boltzmann model. We show that an off-lattice D3Q27 model exists with correct equilibrium to recover Galilean-invariant form of Navier-Stokes equation (without any cubic error). In the first part of this work, we show that the present model can capture two important features of the microflow in a single Component Gas: Knudsen boundary layer and Knudsen Paradox. Finally, we present numerical results corresponding to Couette flow for two representative Knudsen numbers. We show that the off-lattice D3Q27 model exhibits better accuracy as compared to more widely used on-lattice D3Q19 or D3Q27 model. Finally, our construction of discrete velocity model shows that there is no contradiction between entropic construction and quadrature-based procedure for the construction of the lattice Boltzmann model.

Caroline Amiot - One of the best experts on this subject based on the ideXlab platform.

  • cavity enhanced absorption spectroscopy in the mid infrared using a supercontinuum source
    Applied Physics Letters, 2017
    Co-Authors: Caroline Amiot, Antti Aalto, Piotr Ryczkowski, Juha Toivonen, Goery Genty
    Abstract:

    We demonstrate incoherent broadband cavity enhanced absorption spectroscopy in the mid-infrared wavelength range from 3000 to 3450 nm using an all-fiber based supercontinuum source. Multi-Component Gas detection is performed, and the concentrations of acetylene and methane are retrieved with sub-ppm accuracy. A linear response to nominal Gas concentrations is observed, demonstrating the feasibility of the method for sensing applications.We demonstrate incoherent broadband cavity enhanced absorption spectroscopy in the mid-infrared wavelength range from 3000 to 3450 nm using an all-fiber based supercontinuum source. Multi-Component Gas detection is performed, and the concentrations of acetylene and methane are retrieved with sub-ppm accuracy. A linear response to nominal Gas concentrations is observed, demonstrating the feasibility of the method for sensing applications.

  • Cavity enhanced absorption spectroscopy in the mid-infrared using a supercontinuum source
    Appl.Phys.Lett., 2017
    Co-Authors: Caroline Amiot, Antti Aalto, Piotr Ryczkowski, Juha Toivonen, Goery Genty
    Abstract:

    We demonstrate incoherent broadband cavity enhanced absorption spectroscopy in the mid-infrared wavelength range from 3000 to 3450 nm using an all-fiber based supercontinuum source. Multi-Component Gas detection is performed, and the concentrations of acetylene and methane are retrieved with sub-ppm accuracy. A linear response to nominal Gas concentrations is observed, demonstrating the feasibility of the method for sensing applications.

Roman R Rafikov - One of the best experts on this subject based on the ideXlab platform.

  • the local axisymmetric instability criterion in a thin rotating multiComponent disc
    Monthly Notices of the Royal Astronomical Society, 2001
    Co-Authors: Roman R Rafikov
    Abstract:

    Purely gravitational perturbations are considered in a thin rotating disc composed of Gas and several stellar Components. The dispersion relation for the axisymmetric density waves propagating through the disc is found and the criterion for the local axisymmetric stability of the whole system is formulated. In the appropriate limit of two-Component Gas we confirm the findings of Jog & Solomon and extend consideration to the case when one Component is collisionless. Gravitational stability of the Galactic disc in the solar neighbourhood based on the multiComponent instability condition is explored using recent measurements of the stellar composition and kinematics in the local Galactic disc obtained by the Hipparcos satellite.

  • local axisymmetric instability criterion in the thin rotating multiComponent disk
    arXiv: Astrophysics, 2000
    Co-Authors: Roman R Rafikov
    Abstract:

    Purely gravitational perturbations are considered in a thin rotating disk composed of several Gas and stellar Components. The dispersion relation for the axisymmetric density waves propagating through the disk is found and the criterion for the local axisymmetric stability of the whole system is formulated. In the appropriate limit of two-Component Gas we confirm the findings of Jog & Solomon (1984) and extend consideration to the case when one Component is collisionless. Gravitational stability of the Galactic disk in the Solar neighborhood based on the multiComponent instability condition is explored using recent measurements of the stellar composition and kinematics in the local Galactic disk obtained by Hipparcos satellite.

Goery Genty - One of the best experts on this subject based on the ideXlab platform.

  • cavity enhanced absorption spectroscopy in the mid infrared using a supercontinuum source
    Applied Physics Letters, 2017
    Co-Authors: Caroline Amiot, Antti Aalto, Piotr Ryczkowski, Juha Toivonen, Goery Genty
    Abstract:

    We demonstrate incoherent broadband cavity enhanced absorption spectroscopy in the mid-infrared wavelength range from 3000 to 3450 nm using an all-fiber based supercontinuum source. Multi-Component Gas detection is performed, and the concentrations of acetylene and methane are retrieved with sub-ppm accuracy. A linear response to nominal Gas concentrations is observed, demonstrating the feasibility of the method for sensing applications.We demonstrate incoherent broadband cavity enhanced absorption spectroscopy in the mid-infrared wavelength range from 3000 to 3450 nm using an all-fiber based supercontinuum source. Multi-Component Gas detection is performed, and the concentrations of acetylene and methane are retrieved with sub-ppm accuracy. A linear response to nominal Gas concentrations is observed, demonstrating the feasibility of the method for sensing applications.

  • Cavity enhanced absorption spectroscopy in the mid-infrared using a supercontinuum source
    Appl.Phys.Lett., 2017
    Co-Authors: Caroline Amiot, Antti Aalto, Piotr Ryczkowski, Juha Toivonen, Goery Genty
    Abstract:

    We demonstrate incoherent broadband cavity enhanced absorption spectroscopy in the mid-infrared wavelength range from 3000 to 3450 nm using an all-fiber based supercontinuum source. Multi-Component Gas detection is performed, and the concentrations of acetylene and methane are retrieved with sub-ppm accuracy. A linear response to nominal Gas concentrations is observed, demonstrating the feasibility of the method for sensing applications.

Amir H. Mohammadi - One of the best experts on this subject based on the ideXlab platform.

  • Computational procedure for determination of minimum miscibility pressure of reservoir oil
    Fuel, 2013
    Co-Authors: Alireza Fazlali, Mohammad Nikookar, Amir H. Mohammadi
    Abstract:

    Abstract A methodology has been developed for computing minimum miscibility pressure (MMP) for the displacement of oil by multi-Component Gas injection (It is focused on multiple contact miscibility mechanism (forward/backward)). The algorithm is presented for the calculation of the minimum miscibility pressure using an equation of state. The Peng–Robinson (PR) equation of state (EoS) along with random mixing rules is used to determine phase behavior of oil and Gas. The key assumption of the method is that the MMP is completely independent of the porous media. This algorithm handles vaporizing (forward multiple contact) miscibility mechanisms. The MMP calculations include pressure/temperature flash calculations and oil properties characterization method of Riazi–Daubert. The proposed algorithm is fast and easy to compute.