Surfactant-laden droplet behavior on wetting solid wall with non-Newtonian fluid rheology

2019 ◽  
Vol 31 (9) ◽  
pp. 092104 ◽  
Keyword(s):  
Newtonian Fluid ◽  
Solid Wall ◽  
Droplet Behavior ◽  
Fluid Rheology

Heat Transfer and Entropy Generation Characteristics of a Non-Newtonian Fluid Squeezed and Extruded Between Two Parallel Plates

2016 ◽  
Vol 139 (2) ◽  
Author(s):  
P Kaushik ◽  
Pranab Kumar Mondal ◽  
Sukumar Pati ◽  
Suman Chakraborty
Keyword(s):  
Heat Transfer ◽  
Newtonian Fluid ◽  
Entropy Generation ◽  
Bejan Number ◽  
Engineering Systems ◽  
Power Law Model ◽  
Parallel Plates ◽  
Unsteady Heat Transfer ◽  
Thermodynamic Performance ◽  
Fluid Rheology

This study investigates the unsteady heat transfer and entropy generation characteristics of a non-Newtonian fluid, squeezed and extruded between two parallel plates. In an effort to capture the underlying thermo-hydrodynamics, the power-law model is used here to describe the constitutive behavior of the non-Newtonian fluid. The results obtained from the present analysis reveal the intricate interplay between the fluid rheology and the squeezing dynamics, toward altering the Nusselt number and Bejan number characteristics. Findings from this study may be utilized to design optimal process parameters for enhanced thermodynamic performance of engineering systems handling complex fluids undergoing simultaneous extrusion and squeezing.

scholarly journals A Graphical Technique for Solving the Couette-Poiseuille Problem for Generalized Newtonian Fluids

2018 ◽  
Vol 63 (1) ◽  
pp. 200-209
Author(s):  
Péter Nagy-György ◽  
Csaba Hős
Keyword(s):  
Newtonian Fluid ◽  
Parallel Plates ◽  
Generalized Newtonian Fluid ◽  
Viscosity Function ◽  
Local Shear ◽  
Graphical Technique ◽  
Profile Flow ◽  
Primary Variable ◽  
Fluid Rheology ◽  
Local Shear Stress

This paper addresses the mixed Couette-Poiseuille problem, that is the flow between two parallel plates, in the presence of simultaneous pressure gradient and wall motion. Instead of the wall-normal coordinate y, we use the local shear stress as our primary variable and rewrite the corresponding formulae for the velocity profile, flow rate, etc. This gives rise to a graphical technique for solving the problem in the case of arbitrary (possibly measured) generalized Newtonian fluid rheology. We demonstrate the use of the proposed technique on two problems: (a) Bingham fluid and (b) a non-Newtonian fluid with general, nonmonotonous viscosity function.

Electromagnetohydrodynamic Flow of Powell-Eyring Fluids in a Narrow Confinement

2016 ◽  
Vol 33 (2) ◽  
pp. 225-233 ◽  
Author(s):  
F.-Q. Li ◽  
Y.-J. Jian ◽  
Z.-Y. Xie ◽  
L. Wang
Keyword(s):  
Newtonian Fluid ◽  
Homotopy Perturbation Method ◽  
Volume Flow Rate ◽  
Strength Parameter ◽  
Electrical Field ◽  
Electrical Field Strength ◽  
Numerical Result ◽  
Fluid Rheology ◽  
Good Agreement ◽  
Fluid Parameters

AbstractIn this work, we investigate electromagnetohydrodynamic (EMHD) flow of Powell-Eyring fluid through a slit confinement. The approximate analytical solution and numerical result of EMHD velocity are obtained by using homotopy perturbation method and Chebyshev spectral method, respectively. The analytical solutions are found to be in good agreement with numerical results under the same conditions. The influences of Hartmann number Ha, electrical field strength parameter S, the Powell-Eyring fluid parameters γ and β on velocity are discussed in detail. It is found that the volume flow rate of Newtonian fluid is always larger than that of Powell-Eyring fluid. The results reveal the intricate interaction between EMHD effect and fluid rheology involving non-Newtonian fluid. Therefore, the results are useful in dealing with some non-Newtonian biomicrofluidic systems.

scholarly journals An active particle in a complex fluid

2017 ◽  
Vol 823 ◽  
pp. 675-688 ◽  
Author(s):  
Charu Datt ◽  
Giovanniantonio Natale ◽  
Savvas G. Hatzikiriakos ◽  
Gwynn J. Elfring
Keyword(s):  
Newtonian Fluid ◽  
Slip Velocity ◽  
Shear Thinning ◽  
Reciprocal Theorem ◽  
Janus Particle ◽  
Active Particles ◽  
Complex Fluid ◽  
The Reciprocal Theorem ◽  
Fluid Rheology ◽  
Shear Thinning Fluid

In this work, we study active particles with prescribed surface velocities in non-Newtonian fluids. We employ the reciprocal theorem to obtain the velocity of an active spherical particle with an arbitrary axisymmetric slip velocity in an otherwise quiescent second-order fluid. We then determine how the motion of a diffusiophoretic Janus particle is affected by complex fluid rheology, namely viscoelasticity and shear-thinning viscosity, compared to a Newtonian fluid, assuming a fixed slip velocity. We find that a Janus particle may go faster or slower in a viscoelastic fluid, but is always slower in a shear-thinning fluid as compared to a Newtonian fluid.

Non-Newtonian fluid displacements in horizontal narrow eccentric annuli: effects of slow motion of the inner cylinder

2010 ◽  
Vol 653 ◽  
pp. 137-173 ◽  
Author(s):  
M. CARRASCO-TEJA ◽  
I. A. FRIGAARD
Keyword(s):  
Newtonian Fluid ◽  
Slow Motion ◽  
Travelling Wave ◽  
Newtonian Fluids ◽  
Leading Order ◽  
Closure Relations ◽  
Model Derivation ◽  
Eccentric Annuli ◽  
Important Extension ◽  
Fluid Rheology

We study non-Newtonian fluid displacements in horizontal narrow eccentric annuli in the situation where the inner cylinder is moving. This represents a practically important extension of the model analysed by Carrasco-Teja et al. (J. Fluid Mech., vol. 605, 2008, pp. 293–327). When motion of the inner cylinder is included, the Hele-Shaw model closure becomes significantly more complex and extremely costly to compute, except for Newtonian fluids. In the first part of the paper we address the model derivation and closure relations. The second part of the paper considers the limit of large buoyancy number, in which the interface elongates along the annulus. We derive a lubrication-style model for this situation, showing that the leading-order interface is symmetric. Rotation of the inner cylinder only affects the length of the leading-order interface, and this occurs only for non-Newtonian fluids via shear-thinning effects. At first order, casing rotation manifests in an asymmetrical ‘shift’ of the interface in the direction of the rotation. We also derive conditions on the eccentricity, fluid rheology and inner cylinder velocity, under which we are able to find steady travelling wave displacement solutions.

scholarly journals The Effect of Heat Transfer and Polymer Concentration on Non-Newtonian Fluid from Pore-Scale Simulation of Rock X-Ray micro-CT

2017 ◽  
Author(s):  
Moussa Tembely ◽  
Ali M. AlSumaiti ◽  
Mohamed S. Jouini ◽  
Khurshed Rahimov
Keyword(s):  
Heat Transfer ◽  
Numerical Model ◽  
Newtonian Fluid ◽  
Polymer Concentration ◽  
Isothermal Condition ◽  
Operating Conditions ◽  
Flow Index ◽  
Micro Ct ◽  
Pore Scale ◽  
Fluid Rheology

Most of the pore-scale imaging and simulations of non-Newtonian fluid are based on the simplifying geometry of network modeling and overlook the fluid rheology and heat transfer. In the present paper, we developed a non-isothermal and non-Newtonian numerical model of the flow properties at pore-scale by direct simulation of the 3D micro-CT images using a Finite Volume Method (FVM). The numerical model is based on the resolution of the momentum and energy conservation equations. Owing to an adaptive meshing technique and appropriate boundary conditions, rock permeability and mobility are accurately computed. A temperature and concentration-dependent power-law viscosity model in line with the experimental measurement of the fluid rheology is adopted. The model is first applied at isothermal condition to 2 benchmark samples, namely Fontainebleau sandstone and Grosmont carbonate, and is found to be in good agreement with the Lattice Boltzmann method (LBM). Finally, at non-isothermal conditions, an effective mobility is introduced that enables to perform a numerical sensitivity study to fluid rheology, heat transfer, and operating conditions. While the mobility seems to evolve linearly with polymer concentration, the effect of the temperature seems negligible by comparison. However, a sharp contrast is found between carbonate and sandstone under the effect of a constant temperature gradient. Besides concerning the flow index and consistency factor, a good master curve is derived when normalizing the mobility for both the carbonate and the sandstone.

Entropy Generation Minimization in an Electroosmotic Flow of Non-Newtonian Fluid: Effect of Conjugate Heat Transfer

2016 ◽  
Vol 138 (5) ◽  
Author(s):  
Prakash Goswami ◽  
Pranab Kumar Mondal ◽  
Anubhab Datta ◽  
Suman Chakraborty
Keyword(s):  
Heat Transfer ◽  
Newtonian Fluid ◽  
Entropy Generation ◽  
Conjugate Heat Transfer ◽  
Transfer Problem ◽  
Heat Removal ◽  
Entropy Generation Rate ◽  
Fluidic Channel ◽  
Thermal Boundary Conditions ◽  
Fluid Rheology

We investigate the entropy generation characteristics of a non-Newtonian fluid in a narrow fluidic channel under electrokinetic forcing, taking the effect of conjugate heat transfer into the analysis. We use power-law model to describe the non-Newtonian fluid rheology, in an effort to capture the essential thermohydrodynamics. We solve the conjugate heat transfer problem in an analytical formalism using the thermal boundary conditions of third kind at the outer surface of the walls. We bring out the alteration in the entropy generation behavior as attributable to the rheology-driven alteration in heat transfer, coupled with nonlinear interactions between viscous dissipation and Joule heating originating from electroosmotic effects. We unveil optimum values of different parameters, including both the geometric as well as thermophysical parameters, which lead to the minimization of the entropy generation rate in the system. We believe that the inferences obtained from the present study may bear far ranging consequences in the design of various cooling and heat removal devices/systems, for potential use in microscale thermal management.

Use of the inverse method to check the stress predictions in rough elastohydrodynamic lubrication contacts lubricated with a non-Newtonian fluid for a range of asperity geometries

2003 ◽  
Vol 217 (8) ◽  
pp. 935-944 ◽  
Author(s):  
C J Hooke ◽  
K Y Li
Keyword(s):  
Newtonian Fluid ◽  
Inverse Method ◽  
Maximum Stress ◽  
Elastohydrodynamic Lubrication ◽  
Material Strength ◽  
Soft Surface ◽  
Disc Material ◽  
Fluid Properties ◽  
Fluid Rheology ◽  
Good Agreement

The inverse method enables a check to be made on the pressures and stresses calculated in rough elastohydrodynamic lubrication (EHL) contacts. Essentially, a rough, soft surface is run against a smooth, hard counterface in a twin disc machine for a limited time. This tends to deform the asperities on the soft disc and, at the end of the run, the profile is measured and used as input to an EHL solver to determine the hydrodynamic pressures. From these the stresses are calculated. If the material has deformed and deformation has ceased, the maximum stress should be equal to the yield strength of the soft disc. This comparison provides a quantitative check on the accuracy of the EHL analysis and on the assumptions made about the fluid rheology. Allowance has, of course, to be made for the build-up of residual stress in the disc material. The method is applied here to surfaces in which defects with a range of sizes have been manufactured. A non-Newtonian fluid with reasonably well-established characteristics was used under conditions of moderate slip. Good agreement is found between the predicted stresses and the material strength for all defect geometries, suggesting that the fluid properties are sufficiently well defined for accurate predictions to be made of the pressures and stresses in EHL conjunctions.

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