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.

Numerical Study of Fluid Behavior Induced by Anchor Impeller in a Stirred Vessel

Abstract: In the present paper, we have described in-depth numerical study of the basic fluid mechanics problem of yield stress fluid flow with regularization model of Berovier and Engelman in a cylindrical vessel not chicaned equipped with an anchor stirrer by using computational fluid dynamics (CFD) based on the finite volumes method discretization of Navier - Stokes equations formulated in variables (U.V.P). We study the effect of inertia and the yield stress influence by the variation of Hedstrom number on the flow; we have analyzed also the influence of rheological parameters on the hydrodynamic flow behavior, such as the velocity components and the power consumption.

Estimation of the volume rate during turbulent fluid flow in a cylindrical channel

Abstract: A relation for calculating the volume fluid rate through a cylindrical channel under turbulent conditions, which is a function of the dynamic velocity, tube radius, and kinematic viscosity of liquid, is proposed. Experimental testing of the derived formula, performed on liquids of different chemical nature (water and petroleum) showed the reliability of calculated results in theoretical prediction of the volume flow rate under turbulent fluid flow conditions.

球・バネマクロモデルによる粘弾性流体の直接数値シミュレーション : モデル化と解析方法

Abstract: We propose a new bead-spring model for direct numerical simulation of viscoelastic fluid flow. The present bead-spring macromodel, which has a tetrahedral structure, models a gathering of interwined polymer chain, and is used to investigate the interference between fluid and particles. In this paper, the method of analysis is presented and characteristics of two-dimensional Poiseuille flow are examined. As a result, the following was clarified. Fluid which contains bead-spring macromodels has a non-Newtonian viscosity and shear-thinning characteristics. The cause of the shear thinning characteristics is the interaction of rotation and the transformation of the bead-spring macromodel.

Effect of heat transfer on the flow of herschel-bulkley fluid in a compliant channel with peristalsis: Peristaltic transport of herschel-bulkley fluid

Abstract: The present study discusses the peristaltic flow of Herschel-Bulkley fluid in a two-dimensional flexible channel. The heat transfer effects are also considered and the analysis has been done by taking a non-uniform channel into account. Analytical expressions of solution have been obtained using long wavelength analysis. Influence of various emerging parameters has been sketched and discussed through graphs.

Squeeze film flow of viscoplastic Bingham fluid between non-parallel plates

Abstract: Squeeze film flow of a viscoplastic Bingham fluid between non-parallel plates has been analysed. It is assumed that the force applied to the plates is known, therefore, their velocity must be found, and the film thickness decreases then as time proceeds. Moreover, for non-parallel plates, the position along the plates at which flow reverses direction is found as part of the solution. In the Newtonian limit, the thickness of the gap between the plates in the parallel system never quite reaches zero at any finite time, while for the non-parallel case a finite time can be obtained when the plates touch one another at a point. In squeeze flow of a viscoplastic Bingham fluid between parallel and non-parallel plates, under a fixed applied force, a final steady film thickness can sometimes be reached. This final thickness turns out to be sensitive not just to the plate tilt angle but also to the so called Oldroyd number which is defined as the ratio between yield stress and imposed stress. Nevertheless for squeeze film flow of Bingham viscoplastic fluid between non-parallel plates, the results show that other cases exist in which the lubrication force cannot always balance the applied force, leading to the plates approaching and touching at the narrowest end of the gap. Moreover torques that develop within the system have been analysed. • Squeeze flow of fluid between non-parallel plates is considered. • Fluid is considered as Bingham viscoplastic. • In some cases, plates stop at finite height; in other cases, plates touch. • Which case is realised depends on tilt angle and Oldroyd number. • Torque in Bingham fluid is lower than in Newtonian.