Rheology of Concentrated Suspensions of Fibers in Tube Flow: II. An Exploratory Study PDF Download
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Author: Richard O. Maschmeyer Publisher: ISBN: Category : Languages : en Pages : 27
Book Description
The viscosities of concentrated suspensions of glass fibers in high viscosity silicone oil were measured with a capillary viscometer using 1/4 inch and 1/8 inch diameter capillaries. Suspension fiber length distributions and rheological properties were highly dependent on mixing technique. The viscosity of the suspensions was strongly dependent on fiber length distribution--a few percent of relatively long fibers in the distribution doubled or tripled the suspension viscosity. Special attention was paid to wall effects which complicate the interpretation of suspension viscosity data. Yield stresses, squeeze-through, the capillary entrance exclusion were observed; their magnitudes increased with fiber length and depended strongly on fiber length distribution.
Author: Richard O. Maschmeyer Publisher: ISBN: Category : Languages : en Pages : 27
Book Description
The viscosities of concentrated suspensions of glass fibers in high viscosity silicone oil were measured with a capillary viscometer using 1/4 inch and 1/8 inch diameter capillaries. Suspension fiber length distributions and rheological properties were highly dependent on mixing technique. The viscosity of the suspensions was strongly dependent on fiber length distribution--a few percent of relatively long fibers in the distribution doubled or tripled the suspension viscosity. Special attention was paid to wall effects which complicate the interpretation of suspension viscosity data. Yield stresses, squeeze-through, the capillary entrance exclusion were observed; their magnitudes increased with fiber length and depended strongly on fiber length distribution.
Author: Richard O. Maschmeyer Publisher: ISBN: Category : Languages : en Pages : 36
Book Description
Capillary viscometer measurements were made on a series of concentrated suspensions with the same fiber length distribution. Shear stress-shear rate data are reported for 0, 15, and 30 vol.% glass fiber suspensions in 100, 600, and 1000 P silicone oil. Yield stresses, wall effects, concentration defects, squeeze-through, and capillary entrance exclusion were not significant in the measurements. With other parameters held constant, the suspension viscosity increased with oil viscosity. The data were fit by a dimensionless plot of the form F(fRe, De) = 0 where f is the friction factor for tube flow and Re and De are the Reynolds and Deborah numbers of the system. The suspension viscosity increased with fiber concentration, but the magnitude of the increase was highly shear rate dependent. The data are compared with literature predictions for the dependence of suspension viscosity on fiber concentration and shear rate.
Author: Publisher: ISBN: Category : Aeronautics Languages : en Pages : 970
Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author: Richard O. Maschmeyer
Author: Richard O. Maschmeyer
Author: Richard O. Maschmeyer
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Author: Michael Philip Petrich
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Author: Society of Rheology (U.S.)
Author: Technology Reports Centre (Great Britain)
Author: Richard Orr Maschmeyer
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