Nanoparticles formed during mineral-fluid interactions

Nanoindentation is becoming an increasingly popular tool in the biomaterials field due to its ability to measure local mechanical properties in small, irregularly-shaped or heterogeneous samples.1 Although this technique was readily adapted to the study of mineralized tissues, the application of nanoindentation to compliant, hydrated biomaterials such as soft tissues and hydrogels has led to many challenges.1 Three key concerns associated with nanoindentation of compliant, hydrated materials are inaccurate surface detection, errors due to adhesion forces, and fluid interactions with the tip.1–4

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Molecular Dynamics Study of Fluid- Fluid and Solid- Fluid Interactions in Mixed-Wet Shale Pores

SSRN Electronic Journal ◽

10.2139/ssrn.3978741 ◽

2021 ◽

Author(s):

Changjae Kim ◽

Deepak Devegowda

Keyword(s):

Molecular Dynamics ◽

Fluid Interactions

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Viscous Flows Involving a Liquid-Vapor Compound Droplet

10.1115/imece2001/fed-24942 ◽

2001 ◽

Author(s):

D. Palaniappan

Keyword(s):

Exact Solutions ◽

Viscosity Ratio ◽

Numerical Algorithms ◽

Flow Fields ◽

Continuous Phase ◽

Boundary Integral ◽

Liquid Volume ◽

Drag Forces ◽

Compound Droplet ◽

Fluid Interactions

Abstract Exact analytical solutions for steady-state axisymmetric creeping flows in and around a compound multiphase droplet are presented. The solutions given here explain the droplet fluid interactions in uniform and nonuniform flow fields. The compound droplet has a two-sphere geometry with the two spherical surfaces (of unequal radii) intersecting orthogonally. The surface tension forces are assumed to be sufficiently large so that the interfaces have uniform curvature. The singularity solutions for the uniform and paraboloidal flows in the presence of a compound droplet are derived using the method of reflections. The exact solutions for the velocity and pressure fields in the continuous and dispersed phases are given in terms of the fundamental singularities (Green’s functions) and their derivatives. It is found that flow fields and the drag forces depend on two parameters namely, the viscosity ratio and the radii ratio. In the case of paraboloidal flows, a single or a pair of eddies is noticed in the continuous phase for various values of these parameters. The eddies changes their size and shape if the size of the droplet is altered. These observations may be useful in the study of hydrodynamic interactions of compound droplets in complex situations. It is found that the Stokes resistance is greater when the liquid volume is large compared to the vapor volume in uniform flow. It is also noticed that the maximum value of the drag in paraboloidal flow depends on the viscosity ratio and significantly on the liquid volume in the dispersed phase. The exact solutions presented here may be useful for boundary integral formulations that are based on special kernels and also in validating numerical algorithms and codes on multiphase flow and droplet-fluid interactions.

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