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Statements

Subject Item
n2:RIV%2F68407700%3A21220%2F12%3A00199452%21RIV13-MSM-21220___
rdf:type
n10:Vysledek skos:Concept
rdfs:seeAlso
http://epilepsy.biomed.cas.cz/hb2012/HB2012_files/HB2012_abstracts.pdf
dcterms:description
This paper presents a fluid transient inflation experiment with a viscoelastic latex tube and its numerical simulation. Mathematical description of experimental setup (inflated tube, piping and pressurized vessel) is based on the windkessel model and on a nonlinear viscoelastic constitutive model of the inflated tube. The viscoelastic model is derived from the principle of maximized dissipated energy. Resulting system of ordinary differential equations is solved numerically by implicit Euler method. A thin wall latex tube of a small diameter (5mm) was tested first by a static inflation giving purely elastic part of the constitutive viscoelastic model. The following transient experiment (recording frequency and attenuation of pressure oscillations) enables to identify a relaxation parameter of the suggested viscoelastic model. Attenuation of the recorded pressure oscillation is caused by the tested sample viscoelasticity but also by fluid friction. To asses the influence of the (undesirable) fluid friction a series of simulations assuming a purely elastic response of the tube wall and an artificially increased fluid viscosity was carried out too. These results confirmed the hypothesis that the wall viscoelasticity plays an important role in damping of pressure pulsations within the tested specimen. This paper presents a fluid transient inflation experiment with a viscoelastic latex tube and its numerical simulation. Mathematical description of experimental setup (inflated tube, piping and pressurized vessel) is based on the windkessel model and on a nonlinear viscoelastic constitutive model of the inflated tube. The viscoelastic model is derived from the principle of maximized dissipated energy. Resulting system of ordinary differential equations is solved numerically by implicit Euler method. A thin wall latex tube of a small diameter (5mm) was tested first by a static inflation giving purely elastic part of the constitutive viscoelastic model. The following transient experiment (recording frequency and attenuation of pressure oscillations) enables to identify a relaxation parameter of the suggested viscoelastic model. Attenuation of the recorded pressure oscillation is caused by the tested sample viscoelasticity but also by fluid friction. To asses the influence of the (undesirable) fluid friction a series of simulations assuming a purely elastic response of the tube wall and an artificially increased fluid viscosity was carried out too. These results confirmed the hypothesis that the wall viscoelasticity plays an important role in damping of pressure pulsations within the tested specimen.
dcterms:title
Identification of relaxation parameter of a small latex tube Identification of relaxation parameter of a small latex tube
skos:prefLabel
Identification of relaxation parameter of a small latex tube Identification of relaxation parameter of a small latex tube
skos:notation
RIV/68407700:21220/12:00199452!RIV13-MSM-21220___
n10:predkladatel
n11:orjk%3A21220
n3:aktivita
n7:S n7:Z
n3:aktivity
S, Z(MSM6840770012)
n3:dodaniDat
n14:2013
n3:domaciTvurceVysledku
n6:9757538 n6:1885812 Chlup, Hynek
n3:druhVysledku
n19:O
n3:duvernostUdaju
n12:S
n3:entitaPredkladatele
n4:predkladatel
n3:idSjednocenehoVysledku
140329
n3:idVysledku
RIV/68407700:21220/12:00199452
n3:jazykVysledku
n17:eng
n3:klicovaSlova
fluid transient; viscoelasticity; pressure pulsation; maximum dissipation
n3:klicoveSlovo
n9:viscoelasticity n9:maximum%20dissipation n9:pressure%20pulsation n9:fluid%20transient
n3:kontrolniKodProRIV
[C1C19C7E8D62]
n3:obor
n5:BO
n3:pocetDomacichTvurcuVysledku
3
n3:pocetTvurcuVysledku
3
n3:rokUplatneniVysledku
n14:2012
n3:tvurceVysledku
Chlup, Hynek Žitný, Rudolf Hromádka, David
n3:zamer
n18:MSM6840770012
n16:organizacniJednotka
21220