Role of pressure dependent viscosity in measurements with falling cylinder viscometer

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F12%3A10126032" target="_blank" >RIV/00216208:11320/12:10126032 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1016/j.ijnonlinmec.2012.02.001" target="_blank" >http://dx.doi.org/10.1016/j.ijnonlinmec.2012.02.001</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.ijnonlinmec.2012.02.001" target="_blank" >10.1016/j.ijnonlinmec.2012.02.001</a>

Result language
angličtina
Original language name
Role of pressure dependent viscosity in measurements with falling cylinder viscometer
Original language description
The falling cylinder viscometer is frequently used in measuring the dependence of the viscosity on the pressure. The viscosity is calculated using an indirect procedure, namely by appealing to the linear relation between the time taken for the fall and the viscosity. Under certain assumptions, the coefficient of proportionality can be derived analytically, and one gets the classical formula for the viscosity as a function of geometric parameters of the device, density of the fluid and the sinker, gravitational acceleration, and the distance and the time of the fall. Although the classical formula is valid only for fluids with constant viscosity, it is indiscriminately used even for fluids with pressure dependent viscosity. We investigate the role of variable viscosity, and we derive a heuristic correction to the classical formula for the case of fluids with pressure dependent viscosities. The systematic error introduced by the unwarranted application of the classical formula for fluids
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BK - Liquid mechanics
OECD FORD branch
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Project
<a href="/en/project/GPP101%2F12%2FP074" target="_blank" >GPP101/12/P074: Behaviour of incompressible fluid-like materials with pressure dependent material moduli</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2012
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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