Flow of Power-Law Liquids Past a Solid Sphere With and Without Radial Mass Flux at Moderate Reynolds Numbers

Kishore, Nanda; Patnana, Vijaya K.; Chhabra, R.P.

doi:10.1252/jcej.09we001

Cited by 5 publications

(3 citation statements)

References 31 publications

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“…9–11 are solved numerically using a finite difference method‐based simplified marker and cell semi‐implicit algorithm. The detailed solution methodology is presented elsewhere 46–49 and hence only salient features are presented herein. The algorithm employed here is a simplified version of the explicit algorithm from Harlow and Welch 50, and is implemented in spherical coordinates on a staggered grid arrangement.…”

Section: Numerical Methodologymentioning

confidence: 99%

Slip in Flow through Assemblages of Spherical Particles at Low to Moderate Reynolds Numbers

Kishore

Ramteke

2016

Chem Eng & Technol

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Effects of slip velocity and volume fraction of slip spheres on the momentum transfer characteristics of assemblages of slip spheres are numerically investigated. The fluid slip along the surface of the sphere is considered by Navier's linear slip model. The dimensionless governing continuity and momentum equations are solved using a semi-implicit marker and cell method implemented on a staggered grid arrangement in spherical coordinates. The convection and viscous terms of momentum equations are discretized by means of the QUICK scheme and a second-order central differencing scheme, respectively. The present numerical solver is benchmarked via grid independence and comparisons with the existing literature values. Results were obtained over a wide range of pertinent dimensionless numbers such as the Reynolds number, volume fraction of the dispersed phase, and dimensionless slip parameter.

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Section: Numerical Methodologymentioning

confidence: 99%

Slip in Flow through Assemblages of Spherical Particles at Low to Moderate Reynolds Numbers

Kishore

Ramteke

2016

Chem Eng & Technol

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“…The effect of mass injection on drag coefficient of a solid sphere was investigated in previous studies for Newtonian [15,16] and non-Newtonian [17] fluids. It is observed that in a Newtonian medium, applying a radial mass flux on the particle boundary reduces the total drag coefficient of the sphere.…”

Section: Effect On Drag Coefficientmentioning

confidence: 99%

“…The influence of mass injection from the surface of the solid particle has also been studied by previous authors [15][16][17] by implementing outflow on the boundary of a fixed sphere. In later works it is shown that there is a reduction in the total drag coefficient by injecting radial flux from the surface of the sphere which is correlate with mass injection ratios.…”

Section: Introductionmentioning

confidence: 99%

Kinematics and dynamics of suspended gasifying particle

2016

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The effect of gasification on the dynamics and kinematics of immersed spherical and non-spherical solid particles have been investigated using the three-dimensional lattice Boltzmann method. The gasification was performed by applying mass injection on particle surface for three cases: flow passing by a fixed sphere, rotating ellipsoid in simple shear flow, and a settling single sphere in a rectangular domain. In addition, we have compared the accuracy of employing two different fluid-solid interaction methods for the particle boundary. The validity of the gasification model was studied by comparing computed the mass flux from the simulation and the calculated value on the surface of the particle. The result was used to select a suitable boundary method in the simulations combined with gasification. Moreover, the reduction effect of the ejected mass flux on the drag coefficient of the fixed sphere have been validated against previous studies. In the case of rotating ellipsoid in simple shear flow with mass injection, a decrease on the rate of rotation was observed. The terminal (maximum) velocity of the settling sphere was increased by increasing the ratio of radial flux from the particle boundary. IntroductionSolid particle gasification is part of many industrial processes such as combustion of carbonaceous solid fuels in a reactor or gasification of gas hydrate particles in an air lift pump [1,2]. Optimizing these processes to decrease the cost and environmental impacts requires having a profound insight about gasifying suspension behavior in flow.The size and shape of particles are within physical properties of the solid fuels, which strongly affect observed phenomena in combustors and gasifiers. For instance, the rate of gas-solid reactions depends on both available surface area and particle size [3]. Therefore, the study of each individual gasifying particle with different size and shape helps to understand certain properties of the particle flow in large scale.The motion of spherical and non-spherical particles has already been studied in different flow cases such as the settling of single spheres under gravity [4][5][6][7][8] and the rotation of an ellipsoid in simple shear flow [9][10][11][12][13][14]. The influence of mass injection from the surface of the solid particle has also been studied by previous authors [15][16][17] by implementing outflow on the boundary of a fixed sphere. In later works it is shown that there is a reduction in the total drag coefficient by injecting radial flux from the surface of the sphere which is correlate with mass injection ratios. However, to the best of our knowledge, the effect of mass injection on non-spherical or suspended solid particle behavior has so far remained untouched.There are several methods that have been applied to simulate suspension particles, e.g., the finite element method [18,19] or the immersed boundary method, in original form or in combination with other methods Z. Moradi Nour (B) · G. Amberg · M. Do Quang

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Slip in flows of power-law liquids past smooth spherical particles

Kishore

Ramteke

2015

Acta Mech

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Flow of Power-Law Liquids Past a Solid Sphere With and Without Radial Mass Flux at Moderate Reynolds Numbers

Cited by 5 publications

References 31 publications

Slip in Flow through Assemblages of Spherical Particles at Low to Moderate Reynolds Numbers

Slip in Flow through Assemblages of Spherical Particles at Low to Moderate Reynolds Numbers

Kinematics and dynamics of suspended gasifying particle

Slip in flows of power-law liquids past smooth spherical particles

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