Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 14 of 14 for “"non-newtonian flow"”.
-
Non-isothermal non-Newtonian flow and interlayer adhesion in Large Area Additive Manufacturing polymer composite deposition.
… finite element method is used to evaluate Stokes flow of a temperature dependent Carreau-Yasuda fluid for a two-dimensional planar flow field within a Strangpresse Model 19 LAAM extrusion nozzle. A shape optimization method is developed to zero the surface normal velocity to compute the polymer …
-
Controllability of Non-Newtonian fluids under homogeneous flows
… models under homogeneous extensional and shear flows via the Lie bracket method. The constitutive models are as follows: the Phan-Thien-Tanner model; the Johnson-Segalman model; and the Doi model. The effect of extensional flow on these models and the effect of shear flow on the Doi model have …
-
Investigation into the dispensing-based fabrication process for tissue scaffolds
… in terms of their biocompatibility and flow behaviour. The biocompatibility of biomaterials of PLLA, PCL, collagen, chitosan, and gelatine is evaluated in terms of supporting neuron cells’ adhesion and outgrowth. Chitosan solution (2% w/v) in acetic acid is shown to be the most promising …
-
Computer simulation studies of dense suspension rheology. Computational studies of model sheared fluids; elucidation, interpretation and description of the observed rheological behaviour of simple colloidal suspensions in the granulo-viscous domain by Non-Equilibrium Particulate Dynamics.
… of idealised models which exhibit all the non-Newtonian flow phenomenology commonly seen in dense suspensions are investigated by particulate-dynamics computer-simulations. The objectives of these investigations are: (i) to establish the origins of various aspects of dense suspension …
-
Computational studies of the phase behavior and dynamics of rodlike liquid crystals
… a solution also exhibits interesting, complex. non-Newtonian rheological behavior. Liquid-crystalline substances are used in a number of high-performance industrial applications because the aligned, liquid-crystalline structure yields superior mechanical properties in the final product. The …
-
Unsteady newtonian and non-newtonian fluid flows in the circular tube in the presence of magnetic field using caputo-fabrizio derivative
… the magnetohydrodynamics (MHD) transport of Newtonian and non-Newtonian fluids flows inside a circular channel. The flow was subjected to an external electric field for the Newtonian model and a uniform transverse magnetic field for all models. Pressure gradient or oscillating boundary …
-
Numerical simulation of the plastics injection moulding process
… injection moulding process. Weakly compressible, non-Newtonian flow of an amorphous polymer melt under non-isothermal conditions were simulated using constitutive equations generalized to non-Newtonian materials. The finite volume method, which is a very powerful method yet easy to use, was used …
-
Studies of PF Resole / Isocyanate Hybrid Adhesives
… rheometer. The resole/PMDI blends exhibited non-Newtonian flow behavior. The blend viscosity and stability were dependent on the blend ratio, mixing rate and time. The adhesive penetration into wood was found to be dependent on the blend ratio and correlated with the blend viscosity. By using …
-
Interfacial Characterization of Polyhedral Oligomeric Silsesquioxane (POSS) Amphiphiles and Polymer Blends: Thermodynamics, Morphology, and Rheology
… ≈ 3.7 mNm⁻¹. ISR results reveal three different non-Newtonian flow regimes that correlate with phase transitions in the Pi-A isotherms. Further symmetric compression after trilayer formation induces TCyP thin films to self-assemble into highly ordered crystalline-like hydrophobic multilayers (≈8 …
-
A WC-MPS Model for Viscous Free Surface Flows
… they will fail in the simulation of free surface flow problems due to the large deformation and fragmentation, and they suffer from some problems whose objects are a set of discrete physical particles (rather than a continuum). On the contrary, mesh-less particle methods (MPMs), or mesh-free …
-
Friction and lubrication behaviour of metal-on-metal and ZTA ceramic-on-CFR PEEK hip prostheses. Friction and lubrication behaviour of metal-on-metal hip resurfacing and ZTA ceramic heads versus CFR PEEK cups wiith various diameters and clearances using serum-based lubricants with various viscosities.
… ratio suggesting improved lubrication. Viscosity flow curves for the serum-based lubricants having viscosity ¿ 0.00524 Pas showed non-linear relationship between viscosity and shear rate indicating non-Newtonian flow with pseudoplastic or shear-thinning characteristic, i.e. viscosity decreased as …
-
Additive Manufacturing Filled Polymer Composites for Environmental Contaminants: Material Extrusion Processing, Structure and Performance
… the outer walls of confined extrudates within non-Newtonian flow fields due to normal forces, leaving more smaller particles toward outer surfaces. This research provided novel contributions to the environmental and AM research communities and pioneered a convergence of these fields into an …
-
Modeling the flow of non-Newtonian fluids in packed beds at the pore scale
Flow and transport in porous media are important in many science and engineering applications such as composite materials, subsurface water contamination, packed-bed reactors, and enhanced oil recovery. The general approach to modeling such processes is at the continuum scale. Semi-empirical …