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.

Unsteady Second order Fluid Flow between Two Oscillating Plates

Abstract: Unsteady flow of second grade fluid problem is examined between two horizontal oscillating parallel plates. Plates are oscillating with same periods. We consider three unsteady fluid flow problems. We use the OHAM method to solve the non-linear problems arising from the modeling. The physical effect of various modeled parameters on the velocity and temperature fields is discussed and their numerical results are presented. The industrial and technological applications of non-Newtonian fluids greatly change from the Newtonian fluids due to their rheological characteristics. These type liquids do not follow the Newton's law of viscosity. Actually, such fluids are significantly used in geophysics, petroleum, chemical, nuclear industries and many others scientific technologies. Since non-Newtonian fluids cannot be totally defined by one of constitutive equation. One of the very important models suggested for non-Newtonian fluids is called the second grade fluid. In past scholars gives the considerable attention to the second grade fluid which is a simplest subclass of differential type non-Newtonian fluids. Second grade fluid was employed to study many problems due to their comparatively simple model. Few recent articles discussed the flow of second grade fluid have been proposed in literature (1-6).

Effects of Radiation and Porosity on the MHD Flow near a Vertical Plate that Applies Shear Stress to the Fluid

Abstract: Magnetohydrodynamic free convection flow of an incompressible viscous fluid past an infinite vertical plate that applies a shear stress f(t) to the fluid is studied General solutions for the unsteady free convection flow of an incompressible viscous fluid are determined when thermal radiation and porous effects are taken into contemplation Exact dimensionless solutions of momentum and energy, under Boussinesq approximation, are obtained using Laplace transformsThey satisfy all imposed initial and boundary conditions and reduce to known solutions from the literature as special casesThe velocity profile is presented as a sum of convective and mechanical parts The results for embedded parameters are shown graphically

Nonlinear hydrodynamic description of non-Newtonian fluids

Abstract: Embodiments of the present disclosure relate to an outdoor unit of an air conditioner configured to cool a heating unit by making contact with the heating unit, a cooling unit applied thereto, and a method for manufacturing the cooling unit. An outdoor unit of an air conditioner comprises a compressor configured to compress refrigerant; a condenser configured to condense the refrigerant discharged from the compressor; a control box provided with an electronic component configured to control an outdoor unit of an air conditioner; and a cooling unit configured to cool a heating unit by making contact with the heating unit of the electronic component, wherein the cooling unit comprises a heat radiating member having one side thereof make contact with the heating unit; and a refrigerant pipe extended by penetrating through the heat radiating member and in which refrigerant is moved.

Finite element analysis of elastic solid/Stokes flow interaction problem

Abstract: We performed a numerical investigation to find out the optimal choice of the spatial discretization in the distributed-Lagrangian-multiplier/fictitious-domain (DLM/FD) method for the solid/fluid interaction problem. The elastic solid bar attached on the bottom in a pressure-driven channel flow of a Newtonian fluid was selected as a model problem. Our formulation is based on the scheme of Yu (2005) for the interaction between flexible bodies and fluid. A fixed regular rectangular discretization was applied for the description of solid and fluid domain by using the fictitious domain concept. The hydrodynamic interaction between solid and fluid was treated implicitly by the distributed Lagrangian multiplier method. Considering a simplified problem of the Stokes flow and the linearized elasticity, two numerical factors were investigated to clarify their effects and to find the optimum condition: the distribution of Lagrangian multipliers and the solid/fluid interfacial condition. The robustness of this method was verified through the mesh convergence and a pseudo-time step test. We found that the fluid stress in a fictitious solid domain can be neglected and that the Lagrangian multipliers are better to be applied on the entire solid domain. These results will be used to extend our study to systems of elastic particle in the Stokes flow, and of particles in the viscoelastic fluid.

Thermal effects of two immiscible fluids through a permeable stenosed artery having nanofluid in the core region

Abstract: A theoretical investigation of two‐layered fluid flow in a stenosed tube having permeable walls is studied. The fluid (blood with nanoparticles) within the core region behaves as a non‐Newtonian fluid (nanofluid) and the fluid within the peripheral layer behaves as a Newtonian fluid. Flow equations are linearized considering mild stenoses. The closed form mathematical expressions for flow resistance and wall shear stress are computed. The problem is solved using HPM (homotopy perturbation method). The numerical calculations of flow parameters (like flow resistance, wall shear stress) are performed and are discussed graphically. A novel result is found that with increased permeability and viscosity, the resistance of the fluid flow and shear at the wall is found to decrease. Moreover, the velocity profiles are increasing in the radial direction with the enhancement of viscosity of the fluid in the peripheral layer but decrease with permeability. Streamlines are drawn to examine the flow pattern.