US 11,982,607 B2
Method and measuring arrangement for determining a rheological property of a fluid
Dirk Wolfram Schubert, Eggolsheim (DE); Paul Dalton, Eugene, OR (US); and Stefan Schruefer, Erlangen (DE)
Assigned to Friedrich-Alexander-Universitaet Erlangen-Nuernberg, Erlangen (DE); and Julius-Maximilians-Universität Würzburg, Würzburg (DE)
Filed by Friedrich-Alexander-Universitaet Erlangen-Nuernberg, Erlangen (DE); and Julius-Maximilians-Universitaet Wuerzburg, Wuerzburg (DE)
Filed on Dec. 23, 2021, as Appl. No. 17/560,612.
Claims priority of application No. 10 2020 216 545.9 (DE), filed on Dec. 23, 2020.
Prior Publication US 2022/0196534 A1, Jun. 23, 2022
Int. Cl. G01N 11/04 (2006.01); G01N 11/08 (2006.01); G01N 11/00 (2006.01)
CPC G01N 11/08 (2013.01) [G01N 2011/0013 (2013.01); G01N 2011/008 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A method for determining a rheological property of a fluid, which comprises the steps of:
conveying the fluid with a constant volume flow rate through a nozzle;
depositing a fluid strand thereby generated on a substrate while causing a relative movement to take place between the nozzle and the substrate at a forward feed velocity value;
optically measuring a contour of the fluid strand between the nozzle and the substrate; and
calculating a strain rate-dependent extensional viscosity as the rheological property derived from the constant volume flow rate, the forward feed velocity value and the contour of the fluid strand.