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Your search keyword '"Ravichandir, Shashank"' showing total 2 results
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2 results on '"Ravichandir, Shashank"'

1. Scale dependence and non-isochoric effects on the thermohydrodynamics of rarefied Poiseuille flow.

Author

Ravichandir, Shashank and Alam, Meheboob

Subjects
POISEUILLE flow, FLUID mechanics, STREAMFLOW velocity, NONEQUILIBRIUM flow, KNUDSEN flow, MASS transfer
Abstract

The article examines the thermohydrodynamics of rarefied Poiseuille flow in a finite length channel, emphasizing the impact of dilatation and non-isochoric effects. Variations in pressure-driven and acceleration-driven Poiseuille flows are discussed, with a focus on the saturation of mass flow rate at high Knudsen numbers in pressure-driven flow. The study highlights the significance of dilatation in explaining differences in hydrodynamic fields, rheology, and flow-induced heat transfer between the two flows, as well as the implementation of boundary conditions and averaging procedures in the DSMC method. The research suggests that further exploration is needed to understand the implications of dilatation in various flow scenarios and discusses the challenges in solving the Boltzmann equation using the DSMC method. [Extracted from the article]

Published
2024
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2. Hydrodynamics, normal stress differences and heat transfer in rarefied pressure driven Poiseuille flow.

Author

Ravichandir, Shashank and Alam, Meheboob

Subjects
POISEUILLE flow, HEAT transfer, KNUDSEN flow, HYDRODYNAMICS, GAS flow, GRANULAR flow, NON-Newtonian flow (Fluid dynamics)
Abstract

A parallelized Direct Simulation Monte Carlo (DSMC) solver is developed to solve the Boltzmann equation for the pressure-driven Poiseuille flow of monatomic gases over a range of Knudsen numbers in the slip and transitional regimes. The non-Newtonian and non-Fourier effects, along with hydrodynamic fields and rheology, are investigated and compared to the more widely studied acceleration-driven Poiseuille flow. The slip velocity is extracted from the velocity profiles and is expressed in terms of the Knudsen number as a power law. The non-Newtonian effects on stresses are characterised by defining two normal-stress differences whose variations in the stream-wise and wall-normal directions are studied. In addition, the normal and tangential heat fluxes are calculated from the simulation. To isolate the entrance and exit effects, the simulation is carried out for different aspect ratios of the channel keeping the pressure gradient constant. Finally this study is extended to the pressure-driven flow of rarefied granular gases. [ABSTRACT FROM AUTHOR]

Published
2024
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