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Ganesh Dombe, N.K. Yadav, R.M. Lagade, M. Mehilal, Chetan Bhongale
Studies on Measurement of Yield Stress of Propellant Suspensions using Falling Ball and Slump Test
Appl. Rheol. 27:4 (2017) 45262 (7 pages)
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Visco-plasticity characterized by yield stress is an important rheological property of composite propellant suspensions. The
yield stress along with viscosity affects various unit operations in propellant processing as well as the quality of final product.
The characterization of yield stress of propellant suspensions using direct measurement techniques, such as forced falling ball
and slump test is described. The slump test is a simple and quick measurement tool with applicability at processing site whereas
forced ball drop is useful for measurement of very high yield stress. The yield stress measurement of propellant suspension
of four different compositions with varying particle size and volume fraction using above methods is reported and results are
compared with vane geometry of rotational rheometer. Further, the yield stress behavior was studied for the propellant compositions
with increasing solid loading. The dependence of yield stress of the studied propellant compositions on the reduced
packing fraction φ/φm of solids is established and expressed by a mathematical correlation. In addition, effect of vibration on
yield stress was also studied using slump test.
► Cite this publication as follows:
Dombe G, Yadav N, Lagade R, Mehilal M, Bhongale C: Studies on Measurement of Yield Stress of Propellant Suspensions using Falling Ball and Slump Test, Appl. Rheol. 27 (2017) 45262.
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