Herschel–Bulkley fluid

About: Herschel–Bulkley fluid is a research topic. Over the lifetime, 1946 publications have been published within this topic receiving 49318 citations.

A Unified Particle-Based Method for Newtonian and Viscoelastic Fluids Animation

Abstract: In more and more popular physically-based fluid animation field,there are many methods for individually simulating Newtonian fluid or viscoelastic fluid,but few unified techniques are available for both.Based on Smoothed Particle Hydrodynamics,this paper presents a novel unified method for animating both fluids by introducing an additional elastic stress term to the traditional Navier-Stokes equation.The experimental results demonstrate that this new method is not only effective and easy to implement,but also has good controllability.Different viscoelastic and various kinds of fluids behaviors can be obtained easily by adjusting the very few experimental parameters.

Numerical Calculation of the Horizontal Stress Difference of Viscous-Elastic Fluid Acting on the Residual Oil in Micro Pore

Abstract: In order to analyze the microscopic theory of viscous-elastic fluid flooding residual oil, the flow equation of polymer solution in the micro pore can be derived by selecting upper-convected Maxwell constitutive equation, continuity equation and motion equation. Then, the flow velocity field and stress field can be calculated under the boundary condition, and with the theory of stress tensor, the horizontal stress difference of polymer solution acting on the residual oil can be calculated. The results show that the greater the elasticity of viscous-elastic fluid is, the wider the flow channel is, the greater the horizontal stress difference is. The force acting on residual oil by viscous-elastic fluid can be increased by increasing the concentration of the polymer solution.

Fluid dynamics theory for magnetorheological fluids

Abstract: Magnetorheological fluids(MRF) exhibit fast,strong and reversible changes when a magnetic field is applied,making them very interesting for a lot of technical application.MRF change from Newton fluids to Bingham fluids and start to flow when the shearing stress is up to yield stress under the applied magnetic field.Based on Physics and fluid mechanics,fluid dynamics model is presented using the method of continuum to analyze flow field with the influence of a magnetic field.The model can show the influence of magnetic flied on flow flied.

Influence of Velocity and Thermal Slip on the PeristalticTransport of a Herschel-Bulkley Fluid Through anInclined Porous Tube

Abstract: The present paper investigates the impact of velocity slip and thermal slip on the peristaltic transport of a Herschel-Bulkley fluid, flowing through a uniform twodimensional porous tube under the assumptions of long wavelength and low Reynolds number. The mathematical representations of temperature and velocity fields, pressure gradient, and stream function have been found through the closed-form solutions of the energy and momentum equations. Numerical integration has been employed to compute the frictional force and pressure rise. The influence of relevant parameters in the problem have been discussed and presented graphically. The results reveal the increasing effects of thermal and velocity slip on pressure rise and temperature. Also, trapping phenomena of the Herschel-Bulkley fluid is discussed. The volume of the bolus is observed to increase along with the velocity slip parameter

Surface Tension Effect to Die‐Swell Extrusion of Viscoelastic Fluid

Abstract: The die‐swell problem for Viscoelastic fluid by using the finite element methods (FEM) under the semi‐implicit Taylor‐Galerkin pressure correction principle with consistent streamline upwinding is presented. The assumptions of incompressible fluid, creeping flow, no gravitational effect, temperature independence, and no slip effect are used. The two‐dimensional governing equations, in which the equations are nonlinear partial differential equations, are consists of the conservation of mass and momentum, and Oldroy–B model with We<1. The deformation of fluid at free surface will be affect by surface tension force, thus both dynamic and kinematic boundary conditions are considered. These conditions make the simulation result looked reasonable. Evolution of die‐swell flow: the variations of velocities, pressure, stresses, shear rate and extension rate. The simulation program has been created to generate grid and compute the solutions, which utilize remeshing and interpolating techniques as well as the gradie...