Temat: siła hydrodynamiczna - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Potential-based boundary element method to calculate the hydrodynamic drift force on the floating cylinder
Autorzy:: Ghafari, Hamidreza
Motallebi, Mohammad
Ghassemi, Hassan
Powiązania:: https://bibliotekanauki.pl/articles/1839734.pdf
Data publikacji:: 2020
Wydawca:: Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:: floating cylinder
drift forces
boundary element method
siły dryfu
metoda elementów brzegowych
siła hydrodynamiczna
Opis:: This paper presents the calculation of the hydrodynamic drift force by using the potetial-based boundary element method (BEM). The potential theory and far-field wave drift forces solution will be described. The comparison of non-dimensional drift force for surge and heave motions are in good agreement between numerical and experimental data. The effect of different drafts and the radius of a cylinder on the drift forces (surge, heave and pitch) are presented and discussed.
Źródło:: Journal of Applied Mathematics and Computational Mechanics; 2020, 19, 4; 69-79
2299-9965
Pojawia się w:: Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Potential-based boundary element method to calculate the hydrodynamic drift force on the floating cylinder
Autorzy:: Ghafari, Hamidreza
Motallebi, Mohammad
Ghassemi, Hassan
Powiązania:: https://bibliotekanauki.pl/articles/1839744.pdf
Data publikacji:: 2020
Wydawca:: Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:: floating cylinder
drift forces
boundary element method
siły dryfu
metoda elementów brzegowych
siła hydrodynamiczna
Opis:: This paper presents the calculation of the hydrodynamic drift force by using the potetial-based boundary element method (BEM). The potential theory and far-field wave drift forces solution will be described. The comparison of non-dimensional drift force for surge and heave motions are in good agreement between numerical and experimental data. The effect of different drafts and the radius of a cylinder on the drift forces (surge, heave and pitch) are presented and discussed.
Źródło:: Journal of Applied Mathematics and Computational Mechanics; 2020, 19, 4; 69-79
2299-9965
Pojawia się w:: Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Drag force of a porous particle moving axisymmetrically in a closed cavity of micropolar fluid
Autorzy:: Madasu, Krishna Prasad
Powiązania:: https://bibliotekanauki.pl/articles/122694.pdf
Data publikacji:: 2019
Wydawca:: Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:: micropolar fluid
Stokes flow
sphere
concentric
drag force
płyn mikropolarny
prawo Stokesa
siła tarcia
siła hydrodynamiczna
przepływ pełzający
Opis:: The present paper deals with the problem of an incompressible axisymmetric creeping flow caused by a porous spherical particle in a spherical cavity filled with micropolar fluid. Depending on the kind of cell model, appropriate boundary conditions are used on the surface of sphere and spherical cavity. Drag force on the porous particle in the presence of a cavity is calculated to determine the correction factor to the Stokes law. A general expression for the hydrodynamic force acting on the porous sphere and, hence, for the wall correction factor of the sphere are obtained. The special cases of the porous sphere in viscous fluid, zero permeability solid sphere in micropolar fluid and viscous fluid are obtained in open and closed cavity respectively.
Źródło:: Journal of Applied Mathematics and Computational Mechanics; 2019, 18, 4; 41-51
2299-9965
Pojawia się w:: Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Theoretical research of the chip removal process in milling of the closed profile slots
Autorzy:: Gnytko, O.
Kuznetsova, A.
Powiązania:: https://bibliotekanauki.pl/articles/2201130.pdf
Data publikacji:: 2022
Wydawca:: Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:: closed slots
milling
chip removal
mathematical models
pneumatic hydrodynamic force
zamknięte szczeliny
frezowanie
usuwanie wiórów
modele matematyczne
pneumatyczna siła hydrodynamiczna
Opis:: Purpose: The chip removal from the cutting zone of closed slots (T-shaped, "dovetail", etc.) is relevant since the repeated cutting of the chip with the blades of the tool teeth leads to a decrease in the resource of the cutting tool and processing accuracy. However, theoretical studies of the processes of filling, accumulation, and movement of the chip have not been considered. The purpose of the research is to develop the theoretical foundations of the chip filling and removing processes from profile slots using pneumatic hydrodynamic action of pressure jets of cooling liquid. Design/methodology/approach: Several stages of the analysed process are considered, namely the separation and filling of the space between the cutter teeth with the chip, filling the machined slot with the chip, removing the chip element from the space between the cutter teeth, moving the chip element along the machined slot, moving the chip array along the machined slot, pneumatic hydrodynamic impact. Findings: The complex of mathematical models have been developed to describe the functioning of the chip removal system during the milling of the closed profile slots in this research. The set of the developed models makes it possible to determine the required values of the design and operating parameters of devices that ensure the chip removal from the cutting zone as a result of the use of inertial forces and the application of additional compulsory forces. Research limitations/implications: Theoretical studies were applied for T-shaped slots for milling cutters with diameters from 12.5 mm to 95 mm made of high-speed steel and carbide inserts during steels and cast irons processing. The use of pneumatic hydrodynamic action is limited by the diameters of the nozzle hole from 0.5 mm to 3 mm. Practical implications: The practical significance of the research lies in the ability to control the process of timely chip removal from the cutting zone and to prevent the repeated ingress of the chip under the milling cutter blade. This is achieved by a set of mathematical models that simulate the chip removal process. Research can be applied in production in slots milling, using a liquid not only to cool the cutting zone but also to remove the chip in a timely manner. Originality/value: Theoretical studies previously not carried out for closed profile slots are presented in the research.
Źródło:: Archives of Materials Science and Engineering; 2022, 113, 2; 69--76
1897-2764
Pojawia się w:: Archives of Materials Science and Engineering
Dostawca treści:: Biblioteka Nauki

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