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Dimitri Hatziavramidis - One of the best experts on this subject based on the ideXlab platform.

  • modeling and design of jet pumps
    Spe Production Engineering, 1991
    Co-Authors: Dimitri Hatziavramidis
    Abstract:

    Models for jet pumps currently are derived under the assumption that the Power and well Fluids are incompressible liquids that, in many cases, are assumed to have equal densities: When either the well or the Power Fluid contains gas, current design practices still use the equations for incompressible liquids and account for the presence of gas by modifying the mass-flow-rate ratio and the friction-loss coefficients. This paper proposes a new approach to modeling pumps operating under multiphase-flow conditions.

R P Saini - One of the best experts on this subject based on the ideXlab platform.

  • performance analysis of a single stage modified savonius hydrokinetic turbine having twisted blades
    Renewable Energy, 2017
    Co-Authors: Anuj Kumar, R P Saini
    Abstract:

    Abstract Savonius hydrokinetic turbine is one of the prominent vertical axis turbines for tapping hydro potential available in flowing streams in rivers or canals. In spite of their simple design, Savonius turbines have the problem of poor performance. This study aims to enhance the performance of turbine through modification in the blade shape. Under the present study, geometrical parameters namely blade arc angle and blade shape factor are considered to modify the blade shape of Savonius hydrokinetic turbine. A commercial unsteady Reynolds-Averaged Navier-Stokes (URANS) solver in conjunction with realizable k-e turbulence model has been used for numerical analysis. Using CFD analysis, blade arc angle and blade shape factor are optimized on the basis of coefficient of Power. Fluid flow distributions found around the rotor has also been analyzed and discussed. Based on the present investigation, the maximum Power coefficient value of 0.426 is obtained for blade arc angle of 150° and blade shape factor of 0.6 corresponding to TSR value of 0.9 at flow velocity of 2 m/s.

Lindemberg De Jesus Nogueira Duarte - One of the best experts on this subject based on the ideXlab platform.

  • modeling multiphase jet pumps for gas compression
    Journal of Petroleum Science and Engineering, 2019
    Co-Authors: Leonardo Asfora, Adriano Santos, Lindemberg De Jesus Nogueira Duarte
    Abstract:

    Abstract In order to minimize problems and enhance production, many oil-well applications using jet pumps associated with artificial lift systems have been suggested in the literature. In some scenarios, gas from the annulus can be beneficially compressed by using oil-well´s production as Power Fluid. Because multiphase Fluids are generally produced, understanding and modeling multiphase jet pumps for gas compression (MJPG) is essential for design applications. Considering homogeneous multiphase flow, a simplified model is proposed and analytical solutions are presented in this article. A detailed analysis of the proposed model is performed and its physical consequences are discussed. Very good agreement between the proposed model and the conducted 3D numerical simulations (Ansys CFX 16.0) was observed. Furthermore, in agreement with experimental results reported in the literature, the numerical results showed that the MJPG is highly influenced by mixing process in the throat. Finally, the numerical simulations showed that slippage hinders complete mixing in the throat and reduces pump's efficiency.

Anuj Kumar - One of the best experts on this subject based on the ideXlab platform.

  • performance analysis of a single stage modified savonius hydrokinetic turbine having twisted blades
    Renewable Energy, 2017
    Co-Authors: Anuj Kumar, R P Saini
    Abstract:

    Abstract Savonius hydrokinetic turbine is one of the prominent vertical axis turbines for tapping hydro potential available in flowing streams in rivers or canals. In spite of their simple design, Savonius turbines have the problem of poor performance. This study aims to enhance the performance of turbine through modification in the blade shape. Under the present study, geometrical parameters namely blade arc angle and blade shape factor are considered to modify the blade shape of Savonius hydrokinetic turbine. A commercial unsteady Reynolds-Averaged Navier-Stokes (URANS) solver in conjunction with realizable k-e turbulence model has been used for numerical analysis. Using CFD analysis, blade arc angle and blade shape factor are optimized on the basis of coefficient of Power. Fluid flow distributions found around the rotor has also been analyzed and discussed. Based on the present investigation, the maximum Power coefficient value of 0.426 is obtained for blade arc angle of 150° and blade shape factor of 0.6 corresponding to TSR value of 0.9 at flow velocity of 2 m/s.

Louis Gosselin - One of the best experts on this subject based on the ideXlab platform.

  • minimum pumping Power Fluid tree networks without a priori flow regime assumption
    International Journal of Heat and Mass Transfer, 2005
    Co-Authors: Louis Gosselin
    Abstract:

    Abstract In this paper we approach the optimization of Fluid tree networks by relaxing the usual one-flow regime assumption. The pumping Power requirement is minimized, under global volume constraint. Two types of constructal network geometries are investigated: (i) the Fluid users are distributed uniformly on a surface and, (ii) the Fluid users are located on the periphery of a disc-shaped area. In both cases, the flow regime in a given pipe of the network emerges as a result of pumping Power minimization. It is shown that the individual users’ consumption and number of users dictate the transition from one optimal flow regime configuration to another. Under certain circumstances, laminar and turbulent flow regimes are present simultaneously in different pipes of an optimized network. The occurrence of turbulence at a certain level of pipes in the optimal hierarchical networks always leads to turbulence in the higher levels of pipes. The paper provides designers with basic tools for the conceptual design of Fluid networks.