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Comparison of rheological behaviors with fumed silica-based shear thickening fluids
Springer Science and Business Media LLC - Tập 28 - Trang 197-205 - 2016
Shear thickening fluids (STFs) of differing compositions were fabricated and characterised in order to observe the effect of varying chemical and material properties on the resultant rheological behavior. Steady shear tests showed that for a given carrier fluid and particle size exists an optimum weight fraction which exhibits optimal shear thickening performance. Testing also showed that increasi......
An implicit rheological model for numerical simulation of generalized Newtonian fluids
Springer Science and Business Media LLC - Tập 27 - Trang 105-111 - 2015
Fitting an explicit curve over some discrete data extracted from a rheometer is the usual way of writing a rheological model for generalized Newtonian fluids. These explicit models may not match totally with the extracted data and may ignore some features of the rheological behavior of the fluids. In this paper, a cubicspline curve fitting is used to fit a smooth curve from discrete rheological da......
MHD micropumping of viscoelastic fluids: an analytical solution
Springer Science and Business Media LLC - Tập 33 - Trang 93-104 - 2021
An analytical solution is found for examining the effect of a fluid’s elasticity on the performance of MHD micropumps. The test fluid is assumed to be an incompressible viscoelastic fluid obeying the Oldroyd-B model. The flow generated by the Lorentz force is assumed to be laminar, unidirectional, and two-dimensional. The effects of relaxation and retardation times are investigated on the volumetr......
Hydroelastic instability of viscoelastic fluids in developing flow through a compliant channel
Springer Science and Business Media LLC - Tập 32 - Trang 99-119 - 2020
Linear stability of a viscoelastic fluid obeying the Walters’ B model is analytically and numerically investigated in the entrance region of a plane channel formed between two parallel plates. The plates are compliant and obey the two degree-of-freedom von Karman solid model. Having obtained the base-flow velocity profiles using the boundary-layer theory, their vulnerability to infinitesimally sma......
Dynamic viscoelastic properties of polyvinyl chloride with physical aging
Springer Science and Business Media LLC - Tập 27 - Trang 259-266 - 2015
The experimental research of dynamic viscoelastic properties of polyvinyl chloride was conducted by the dynamic mechanical analysis method in this paper. And the fitting equation of dynamic modulus of polymers has been presented. Based on the time-aging time equivalent principle, horizontal shift factor and vertical shift factor of aging time are carried out, which proposes a novel method for the ......
Yield shear stress and disaggregating shear stress of human blood
Springer Science and Business Media LLC - Tập 26 - Trang 191-198 - 2014
This review presents two distinct rheological parameters of blood that have the potential to indicate blood circulation adequacy: yield shear stress (YSS) and disaggregating shear stress (DSS). YSS and DSS reflect the strength of red blood cell (RBC) aggregation in suspension under static and dynamic conditions, respectively. YSS, defined as the critical stress to disperse RBC aggregates under sta......
On the use of viscous micropumps for the transport of thixotropic fluids
Springer Science and Business Media LLC - - Trang 1-15 - 2023
A cylinder rotating in an off-center position across a microchannel is known to generate a net flow for highly viscous Newtonian fluids. The mechanism is also known to be a viable option for the transport of viscoelastic or viscoplastic fluids albeit with a slight drop in performance. In the present work, the applicability of this mechanism is numerically investigated for the transport of (inelast......
Viscoelastic properties of PLA/PCL blends compatibilized with different methods
Springer Science and Business Media LLC - Tập 29 Số 4 - Trang 295-302 - 2017
Application of injection-compression molding to thin-walled polymeric parts
Springer Science and Business Media LLC - Tập 30 - Trang 161-167 - 2018
In this study, we investigated the injection molding (IM) process for the production polymeric parts with thin walls. The injection molding process was numerically modelled, and thin-walled polymeric parts were injection-molded experimentally. In the case of polymeric parts with thin walls, it is critical to understand flow and heat transfer behavior in the mold during the process. Injection-compr......
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