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Edge Effects in Rotational Viscometry VI. ZZ- and KK- Type Sensors: No-slip Pseudosimilarity for Inertialess Flow (Revisited)
Wein, Ondřej ; Havlica, Jaromír
This report should serve as a manual to the program Prog_cL_m.exe for calculating the correction cL on edge effects in narrow-gap rotational viscometry with almost cylindrical or conical spindles. Referring to the previous Research Report ICPF 2004/8, which deals with the same subject, it includes, in addition, also computation of cL for the entire ZZ and KK sensors with an arbitrary front of bottom semi-sensors (FLAT, CONE, HUB, HAAKE). Detailed attention is paid to numerical aspects: extrapolation/interpolation of the related fields (angular velocity, shear stress, dissipation, local torque contribution) towards the boundaries, including the analytical smoothing at singularities. The source codes for Prog_cL_m.exe, the results of numerical simulations, as well as the resulting correlations for cL , are available on the attached CD, which is an integral part of this report. The inertia effect was computed using commercial software FLUENT 12 for the Z40DIN sensor and applied in an approximate way also for the KK35/23 sensor.
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Hranové efekty v rotační viskozimetrii III. ZZ a KK sensory, psudopodobnost totálního skluzu
Wein, Ondřej
The edge effects in AWS rotational viscometry are studied for materials, displaying the total slip at walls, i.e. negligible effect of the bulk shear flow. The found analytic asymptotes correspond to two asymptotic flow behaviour – for Newtonian liquids and ideal plastic materials. The explicit formulas on the edge-effect correction cL for this constitutionally extreme case are given for the ZZ40 according to ISO 3219 (1994) standard and the novel KK35/23 configuration of our own design.
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