Abstract
A slit viscometer has been constructed to measure the viscosity of aqueous systems at temperatures up to 140 °C. Liquid is forced backwards and forwards through the slit by the use of varying air pressure. The flow rate is obtained from the time for the liquid to pass conductivity probes located in liquid reservoirs either side of the slit. The pressure difference between two points on the slit wall is determined using a differential pressure transducer. By varying the slit height measurements can be made on liquids with viscosities in the range 10 to 10−3 Pa s. Shear rates from 10 to 104 s−1 can be achieved. A simple microcomputer control system enables the shear stress to be automatically increased and decreased stepwise. Representative data on polysaccharide solutions and strach suspensions are presented. The viscometer is particularly well-suited for following temperature-dependent biopolymer transitions and the thermal depolymerisation of water soluble polymers.
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References
Gabriel A (1979) in: Berkeley RCW, Gooday GW, Ellwood DC (eds) Microbial Polysaccharides and Polysaccharases. Academic Press, London. Chapter 8, p 191
Whorlow RW (1980) Rheological Techniques. Ellis Horwood, Chichester. Chapter 2
Lodge AS, de Vargas L (1983) Rheol Acta 22:151
Laun HM (1983) Rheol Acta 22:171
Berrington DB (1985) Viscosity Measurement of Food Systems at High Temperatures. PhD Thesis. University of Nottingham
Washburn EW (ed) (1929) International Critical Tables. McGraw Hill Book Co. Inc. Volume 5, p 15
Han CD (1974) Trans Soc Rheol 18:163
Blum DB, Yerushalmi J, Williams DJ (1972) Can J Chem Eng 50:581
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Berrington, D.B., Bradley, T. & Mitchell, J.R. A slit viscometer for the measurement of the viscosity of aqueous systems at high temperatures. Rheol Acta 26, 278–284 (1987). https://doi.org/10.1007/BF01329443
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DOI: https://doi.org/10.1007/BF01329443