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  Home > JCE Print > Journal of Chemical Education > Issues > 2005  > March  >
In the Laboratory
A Low-Cost Experiment on Newtonian and Non-Newtonian Fluids
Manuel Dolz, Jesús Delegido, Alejandro Casanovas, and María-Jesús Hernández
Departament de Termodinàmica, Facultats de Farmàcia i Física, Universitat de València, València, Spain
Cover
March 2005
Vol. 82 No. 3
p. 445
Abstract
An experiment to study the flow of Newtonian and non-Newtonian fluids is proposed. The method is based on measurement of the drag force on a sphere immersed in a moving fluid. The sphere–fluid relative velocity can be changed to obtain the dependence of the shear stress on velocity. This dependence shows the differences in flow of Newtonian and non-Newtonian fluids: decreasing viscosities with increasing velocities are obtained for shear-thinning fluids, while constant values of viscosity with velocity are obtained for Newtonian fluids. Although there is practical interest in the flow of non-Newtonian fluids, the high cost of commercial rotational viscometers used to determine the non-Newtonian behaviour makes them inconvenient for use as dedicated instruments in undergraduates' laboratories. The purpose of this experiment is to show Newtonian and shear-thinning flow to undergraduates using common components of a laboratory.
Supplement
Additional information about the experiment and notes for the instructor are available.
*  Contents JCE2005p0445W.doc (Microsoft Word)
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JCE2005p0445W.zip
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*  Citation
 Dolz, Manuel; Delegido, Jesús; Casanovas, Alejandro; Hernández, María-Jesús. J. Chem. Educ. 2005 82 445.
*  Keywords
 Laboratory Equipment / Apparatus; Laboratory Instruction; Liquids; Physical Chemistry; Undergraduate Research
*  History
 Created:
Last Updated:		 February 2, 2005
February 18, 2005
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