Measuring and testing – Liquid analysis or analysis of the suspension of solids in a... – Viscosity
Patent
1992-11-23
1994-01-11
Warden, Robert J.
Measuring and testing
Liquid analysis or analysis of the suspension of solids in a...
Viscosity
73 5414, G01N 1104
Patent
active
052770583
ABSTRACT:
An improved rheometer of the present invention includes an adjustable gap through which a flowing system is forced. The inner cavity dimension of the gap is variable so as to give a user of the rheometer an ability to vary the separation gap and the length over diameter ratio. This, in turn, allows the user to determine the shear rate and shear stress along the wall of the cavity for varying deformation rates. Thus, the shear viscosity of the flowing system can be characterized for non-Newtonian systems without varying the volumetric flow rate. One of the preferred embodiments of the adjustable gap rheometer is a slit rheometer in which the flowing system is forced through a slit having generally more length than width and more width than gap. The slit rheometer is made adjustable by holding the body of the rheometer stationary while moving an adjustable wall which forms one of the sides of the slit. Another preferred embodiment of the adjustable gap rheometer includes two concentric portions comprising a mandrel portion and a bushing portion. Axial movement of one of the portions relative to the other varies the separation between the components.
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Gokturk Halit S.
Kalyon Dilhan M.
Trembley Theresa A.
Warden Robert J.
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