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Xiang Lin, Jiong Liu, Changqing Wu, Mengmeng Wu, Dongyun Ren, Jun Zhang
Experimental evaluation of the pressure sensitivity of molten polymer viscosity with a triple-stage capillary rheometer
Appl. Rheol. 28:2 (2018) 25503 (8 pages)
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A triple pressure-stage capillary rheometer was individually developed for providing an insight of pressure effect on polymeric
melts viscosity during steady and continuous flow. Three capillary dies with identical/varied diameters and aspect ratio were
assembled in series along the flow direction, relying on which the flow was divided into three zones with varied pressures
under the same flow rate. Several polymeric melts, such as low density polyethylene (LDPE), polystyrene (PS), polypropylene
(PP) as well as its nanocomposites of PP/CaCO3, PP/Mg(OH)2, and PP/ halloysite nanotubes (PP/HNTs) were taken as the experimental
samples. The principles for calculating the pressure sensitivity of shear viscosity in capillary flow were discussed,
including methods based on constant shear rate (CSR), constant shear stress (CSS), and curve superposition (CSP). For the
several polymer melts adopted in this work, a sequence of pressure dependence of viscosity was revealed as PS > PP > LDPE,
which is typically acknowledged.
► Cite this publication as follows:
Lin X, Liu J, Wu C, Wu M, Ren D, Zhang J: Experimental evaluation of the pressure sensitivity of molten polymer viscosity with a triple-stage capillary rheometer, Appl. Rheol. 28 (2018) 25503.
Yang Yang, Hao Wang, Jing Liu
Mobile Phone Enabled Pervasive Measurement of Liquid Viscosity
Appl. Rheol. 21:6 (2011) 63890 (5 pages)
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A new conceptual non-contact method for liquid viscosity measurement in capillary tube using mobile phone
as the data acquisition facility is proposed. The video and image for the capillary force driven flow of the test
liquid was recorded by the phone camera. After the imaging reconstruction of the flow velocity in the horizontal
capillary and the capillary head in the vertical direction, a digital image processing software was developed
to calculate the liquid viscosity in MATLAB 2007b environment, recurring to the established theoretical correlation
for flow mechanics. To demonstrate the feasibility and accuracy of the method, 10 groups of liquid were
measured and the results were compared with the data obtained from a standard rotating viscometer. The relative
error was found falling in the range of 0 ~ 20 %. This study establishes a pervasive low cost way for viscosity
measurement of various solutions.
► Cite this publication as follows:
Yang Y, Wang H, Liu J: Mobile Phone Enabled Pervasive Measurement of Liquid Viscosity, Appl. Rheol. 21 (2011) 63890.
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