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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......
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......
Rheological and electrical percolation behaviors of polyvinyl alcohol/silver nanowire suspensions using different aspect ratio silver nanowires
Springer Science and Business Media LLC - - Trang 1-10 - 2023
The rheological and electrical properties of polyvinyl alcohol (PVA)/silver nanowire (AgNW) suspensions and films are investigated with increasing AgNW concentrations, employing AgNWs with two different aspect ratios, namely 714 and 1000 (referred to as Ag714 and Ag1000, respectively). To estimate the effect of the aspect ratio on the rheological and electrical percolation behavior, the linear rhe......
Flow patterns in 4:1 micro-contraction flows of viscoelastic fluids
Springer Science and Business Media LLC - Tập 27 - Trang 65-73 - 2015
In this paper, the flow pattern of viscoelastic fluids flowing inside a 4:1 planar contraction microchannel was investigated and quantitatively analyzed. A wide range of Weissenberg number flows of poly(ethylene oxide) solutions were observed while maintaining low Reynolds number (0.01 > Re). As the shear rate or fluid elasticity was increased, a transition from steady to unsteady flow was observe......
Rheology and gel point of the enzymatic hydrolysis of urea in the presence of urease
Springer Science and Business Media LLC - Tập 29 - Trang 1-7 - 2017
This study reports on the rheology of the gelation kinetics of raw chitosan (CTS) solutions (2% w/v) produced by enzymatic hydrolysis of urea at different urea concentrations (40, 50, 60, 80, and 100 mM) in the presence of urease at 1 U/mL. Viscoelastic parameters and pH values were evaluated during gelation process and the rheological properties of CTS hydrogels produced were monitored after 24 h......
Relationship between rheology and electro-spinning performance of regenerated silk fibroin prepared using different degumming methods
Springer Science and Business Media LLC - Tập 26 - Trang 119-125 - 2014
Electro-spun silk fibroin (SF) has been studied for biomedical applications because of its good biocompatibility, cyto-compatibility, and simple fabrication method. SF is obtained by a degumming process and the degumming method can affect the degree of molecular degradation of SF during the degumming process. In the present study, the effect of the degumming method on the rheology and electro-spin......
Influence of cationic polymer on the floccule size of cement pastes containing polycarboxylate superplasticizer and Na-bentonite
Springer Science and Business Media LLC - Tập 35 Số 2 - Trang 105-116 - 2023
Field-responsive smart composite particle suspension: materials and rheology
Springer Science and Business Media LLC - Tập 24 - Trang 147-153 - 2012
Both electrorheological (ER) and magnetorheological (MR) fluids are known to be smart materials which can be rapidly and reversibly transformed from a fluid-like to a solid-like state within milliseconds by showing dramatic and tunable changes in their rheological properties under external electrical or magnetic field strength, respectively. Here, among various smart composite particles studied, r......
A nonlinear rheological model for the ultrasonically induced squeeze film effect in variable friction haptic displays
Springer Science and Business Media LLC - Tập 29 - Trang 219-228 - 2017
A squeeze film induced by ultrasonic vibration between two solid surfaces in contact can dramatically reduce the friction between them. This phenomenon, so-called the squeeze film effect, has been utilized in variable friction tactile displays for texture rendering purposes. Such tactile displays can provoke a haptic sensation to a finger pad in a controllable way. A real-time adjustment of the co......
Time-dependent viscoelastic properties of Oldroyd-B fluid studied by advection-diffusion lattice Boltzmann method
Springer Science and Business Media LLC - Tập 29 - Trang 137-146 - 2017
Time-dependent viscoelastic properties of Oldroyd-B fluid were investigated by lattice Boltzmann method (LBM) coupled with advection-diffusion model. To investigate the viscoelastic properties of Oldroyd-B fluid, realistic rheometries including step shear and oscillatory shear tests were implemented in wide ranges of Weissenberg number (Wi) and Deborah number (De). First, transient behavior of Old......
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