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angle angular velocity apparent viscosity approximately biaxial extensional Bingham plastic fluids Brix calculated compression concentric cylinder system cone and plate constant curve deformation determined diameter dimensionless dough dynamic elastic end effects entrance equation evaluated Example Problem experimental data extensional flow extensional viscosity Fanning friction factor Figure flow behavior index flow rate fluid foods frequency Herschel-Bulkley impeller instrument laminar flow linear lubricated measured mixer viscometer modulus Newtonian fluid non-Newtonian fluids normal stress normal stress difference oscillatory testing parallel plate parameters plotted polymer power law fluid pressure drop rad/s radius regression Reynolds number rheogram rheological rheological properties rotational sample shear rate shear stress simple shear solution squeezing flow steady shear Steffe strain rate stress relaxation Table temperature tensile thixotropy torque tube typical uniaxial values velocity profile versus viscoelastic viscometry volumetric flow rate yield stress zero
Page 12 - ... the greatest stress which a material is capable of sustaining without any deviation from proportionality of stress to strain (Hooke's law).
Page 13 - Yield strength is the stress at which a material exhibits a specified limiting deviation from the proportionality of stress to strain. The deviation is expressed in terms of strain, percent offset, total extension under load, etc. Determine yield strength by one of the following methods: 13.2.1 Offset Method— To determine the yield strength by the "offset method...
Page 12 - Poisson's ratio. 6. elastic limit [FL~2] — the greatest stress which a material is capable of sustaining without any permanent strain remaining upon complete release of the stress.
Page 400 - Rheological models used for the prediction of the flow properties of food products: A literature review.
Page 398 - The Cox-Merz rule extended: A rheological model for concentrated suspensions and other materials with a yield stress.
Page 411 - Prud'homme. 1988. Wall slip corrections for Couette and parallel disk viscometers, J.
Page 119 - K is the thermal conductivity, p is the density and Cp is the specific heat of the material (silicon).
Page 401 - A Critical Appraisal of Available Methods for the Measurement of Extensional Properties of Mobile Systems, in Techniques in Rheological Measurements, Ed.
Page 396 - Converging flow and stretching flow: a compilation, J. Non-Newtonian Fluid Mech. 4, 2338 (1978).