Determination of boundary conditions for a numerical calculation of thermal field during hydrogen absorption into a metal hydride container

2019 ◽  
Author(s):  
Tomáš Brestovič ◽  
Natália Jasminská ◽  
Marián Lázár
Keyword(s):  
Numerical Calculation ◽  
Boundary Conditions ◽  
Metal Hydride ◽  
Hydrogen Absorption ◽  
Thermal Field

scholarly journals Thermal and energy balance of a fuel cell during hydrogen supply from metal hydride materials

2020 ◽  
Vol 8 (11) ◽  
pp. 451-456
Author(s):  
Lubica Bednarova ◽  
Lukáš Tóth ◽  
Tomáš Brestovič ◽  
Natália Jasminská ◽  
Marián Lázár ◽  
...  
Keyword(s):  
Numerical Calculation ◽  
Fuel Cell ◽  
Energy Balance ◽  
Present Article ◽  
Metal Hydride ◽  
Thermal Field ◽  
Hydrogen Supply ◽  
Kinetics Of ◽  
Fuel Cell Operation

The present article deals with the material and energy balance of a fuel cell during hydrogen supply from a metal hydride tank. It describes potential utilisation of heat from a fuel cell for heating a tank in order to achieve the required kinetics of the process. The concluding part hereof contains a numerical calculation of the thermal field of the designed tank during the fuel cell operation.

Effect of Boundary Conditions on the Hydrogen Absorption in a Metal Hydride Reactor

2018 ◽  
Author(s):  
Bachir DADDA ◽  
Allal BABBOU ◽  
Rida ZARRIT ◽  
Youcef BOUHADDA ◽  
Said ABBOUDI
Keyword(s):  
Boundary Conditions ◽  
Metal Hydride ◽  
Hydrogen Absorption

scholarly journals Determination of boundary conditions on the airfield surface coating formulation for task modeling its thermal field

2008 ◽  
Vol 34 (1) ◽  
Author(s):  
М.М. Дмитрієв ◽  
О.М. Папченко ◽  
О.Б. Деркачов ◽  
І.А. Рутковська
Keyword(s):  
Boundary Conditions ◽  
Surface Coating ◽  
Thermal Field ◽  
Task Modeling ◽  
Coating Formulation

Polarizability and nonpolarizability of oil-water interfaces with relevance to a.c. impendance measurements

1991 ◽  
Vol 56 (1) ◽  
pp. 112-129 ◽  
Author(s):  
Takashi Kakiuchi ◽  
Mitsugi Senda
Keyword(s):  
Charge Transfer ◽  
Numerical Calculation ◽  
Supporting Electrolyte ◽  
Water Interface ◽  
Migration Effect ◽  
Ac Current ◽  
Stationary Interface ◽  
Oil Water ◽  
Anion Transfer

We have estimated the degree of polarizability of a polarized oil-water interface used as a working interface and that of the nonpolarizability of a nonpolarized interface used as a reference oil-water interface from the numerical calculation of dc and ac current vs potential behavior at both interfaces. Theoretical equations of dc and ac currents for simultaneous cation and anion transfer of supporting electrolytes have been derived for the planar stationary interface for reversible and quasi-reversible cases. In the derivation, the migration effect and the coupling of the cation and anion transfer have been incorporated. The transfer of ions constituting a supporting electrolyte contributes to the total admittance of the interface even in the region where the interface may be considered as polarized in dc sense, as pointed out first by Samec et al. (J. Electroanal. Chem. 126, 121 (1981)). Moreover, the reference oil-water interface is not ideally reversible, so that the contribution from this interface to the measured admittance cannot be negligible, unless the area of the reference oil-water interface is much larger than that of the working oil-water interface. The effect of non-ideality of the reference oil-water interface on the determination of double layer capacitances and kinetic parameters of charge transfer at the working oil-water interface has been estimated.

scholarly journals Stiffness Estimation and Equivalence of Boundary Conditions in FEM Models

2021 ◽  
Vol 11 (4) ◽  
pp. 1482
Author(s):  
Róbert Huňady ◽  
Pavol Lengvarský ◽  
Peter Pavelka ◽  
Adam Kaľavský ◽  
Jakub Mlotek
Keyword(s):  
Boundary Condition ◽  
Finite Element ◽  
Boundary Conditions ◽  
Model Updating ◽  
Element Model ◽  
Computational Time ◽  
Stiffness Coefficients ◽  
First Case ◽  
Numerical Approaches

The paper deals with methods of equivalence of boundary conditions in finite element models that are based on finite element model updating technique. The proposed methods are based on the determination of the stiffness parameters in the section plate or region, where the boundary condition or the removed part of the model is replaced by the bushing connector. Two methods for determining its elastic properties are described. In the first case, the stiffness coefficients are determined by a series of static finite element analyses that are used to obtain the response of the removed part to the six basic types of loads. The second method is a combination of experimental and numerical approaches. The natural frequencies obtained by the measurement are used in finite element (FE) optimization, in which the response of the model is tuned by changing the stiffness coefficients of the bushing. Both methods provide a good estimate of the stiffness at the region where the model is replaced by an equivalent boundary condition. This increases the accuracy of the numerical model and also saves computational time and capacity due to element reduction.

Vectorial thin-element approximation: a semirigorous determination of Kirchhoff's boundary conditions

2007 ◽  
Vol 24 (4) ◽  
pp. 1074 ◽  
Author(s):  
Norbert Kerwien ◽  
Thomas Schuster ◽  
Stephan Rafler ◽  
Wolfgang Osten ◽  
Michael Totzeck
Keyword(s):  
Boundary Conditions ◽  
Element Approximation

Generalized plane stress in a semi-infinite strip under arbitrary end-load

1964 ◽  
Vol 281 (1385) ◽  
pp. 184-206 ◽  
Keyword(s):  
Differential Equation ◽  
Ordinary Differential Equation ◽  
Boundary Conditions ◽  
Fourth Order ◽  
Plane Stress ◽  
Stress Function ◽  
Infinite Strip ◽  
Order Ordinary Differential Equation ◽  
Orthogonal Functions

The problem involves the determination of a biharmonic generalized plane-stress function satisfying certain boundary conditions. We expand the stress function in a series of non-orthogonal eigenfunctions. Each of these is expanded in a series of orthogonal functions which satisfy a certain fourth-order ordinary differential equation and the boundary conditions implied by the fact that the sides are stress-free. By this method the coefficients involved in the biharmonic stress function corresponding to any arbitrary combination of stress on the end can be obtained directly from two numerical matrices published here The method is illustrated by four examples which cast light on the application of St Venant’s principle to the strip. In a further paper by one of the authors, the method will be applied to the problem of the finite rectangle.

Sign in / Sign up

Export Citation Format

Share Document