A general method for obtaining shear stress and normal stress functions from parallel disk rheometry data

Preparation and Evaluation of Miconazole Nitrate-Loaded Solid Lipid Nanoparticles for Topical Delivery

“…For the evaluation of these properties, the applied stress, as well as the duration of the stress application, must be previously defined in order to avoid the destruction of the structure, so that measurements can provide information of the inter-molecular and interparticle forces in the material (21). Small-angle cone and plate rheometers are used to determine the shear stress versus shear rate for a variety of formulations (23). This device has the advantage that experimental data, in the form of measured torque and normal force at different rotational speeds, can be converted directly into shear stress and first normal stress functions, using very simple algebraic expres- Fig.…”

Non-Newtonian flow in parallel-disk viscometers in the presence of wall slip

“…A number of exact and approximate techniques have been developed to convert these data into a shear rate-shear stress τ(γ) relationship via the equations of motion of the fluid under test [2][3][4]. The normal operation conditions of the parallel-disk viscometer allow the equations of motion to be simplified.…”

Identification of non-newtonian rheological parameter through an inverse formulation

“…The results showed that the method provides an attractive alternative for estimation of the extensional viscosity. More recently, inverse formulations tailored to non-Newtonian Fluids were developed by Yeow et al (2005) and by Park et al (2007 and2009) . Park et al (2007) employed a method of estimating rheological parameters, using velocity measurements of secondary flows in a square pipe.…”