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Search results for: ENTROPY BALANCE

  • A role of the heat and work uncompensatedtransformations in the balance of entropy and theturbomachinery efficiency

    Publication
    • T. Kowalczyk
    • P. Ziółkowski
    • D. Sławiński
    • J. Badur
    • M. Cisak

    - Transactions of the Institute of Fluid-Flow Machinery - Year 2017

    In the paper we have presented a procedure of estimating a role of the uncompensated transformation of heat and work in ow of viscous and heat conducting uid. The procedure was introduced by Professor Romuald Puzyrewski and is essential in local, in time and space, balance of entropy. Furthermore this unique approach leads to redenition the eciency of uid-ow machinery in three-dimensional modeling using CFD (Computational Fluid...

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  • Wprowadzenie do analiz egzergetycznych, PG_00059783

    e-Learning Courses
    • P. Ziółkowski

    The aim of the course is to present the basic issues to carry out the balance of exergy and entropy in addition to the balance of mass and energy. To show the definition of the maximum work that a certain matter can do in a thermodynamic process when transitioning to equilibrium with its surroundings.  To refer to chemical exergy and show the application of the exergy balance to define losses in a thermodynamic cycle.

  • Nonlinear resultant theory of shells accounting for thermodiffusion

    Publication

    - CONTINUUM MECHANICS AND THERMODYNAMICS - Year 2021

    The complete nonlinear resultant 2D model of shell thermodiffusion is developed. All 2D balance laws and the entropy imbalance are formulated by direct through-the-thickness integration of respective 3D laws of continuum thermodiffusion. This leads to a more rich thermodynamic structure of our 2D model with several additional 2D fields not present in the 3D parent model. Constitutive equations of elastic thermodiffusive shells...

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  • The description of non-linear interactions of wave and non-wave modes in a non-adiabatic plasma flow

    The method of derivation of non-linear equations for interacting modes is explained and applied to a plasma's flow affected by a magnetic field. It is based on the linear projecting of the total perturbation field into specific variations of variables in individual modes of a flow. The method may be applied in many examples of fluid flows with different mechanisms of non-adiabaticity. It is of special importance in complex flows...

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  • On jump conditions at non-material singular curves in the resultant shell thermomechanics

    Publication

    - Year 2014

    The global, refined, resultant, two-dimensional (2D) balance laws of mass, linear and angular momenta, and energy as well as the entropy inequality were formulated by Pietraszkiewicz (2011) as exact implications of corresponding laws of 3D rational thermomechanics. In case of a shell with the regular base surface and all resultant surface fields differentiable everywhere on it and at any time instant, the local laws of the resultant...