Abstract
Numerical simulation using computational fluid dynamics has been studied broadly in various fields of applications. Along with the advancement in new technology especially those employing micro or nanoscale geometries or lab-on-chip devices, it is important to understand the efficiency of such numerical models at small geometrical scales. To access any potential error in numerical simulation using CFD, in the present work we report the investigation of capillary driven passive flow inside a channel of varying geometry. The potential error in the results of simulation at a very small scale is accessed by comparing it with the results of theoretical analysis. Hence, establishes a spatial limit of the continuum model for simulation in related applications. This gives new insight to the further study on CFD at nanometers scale geometry.
Highlights
Computational Fluid Dynamics (CFD) has been extensively utilized tool in the field of fluid flow and heat transfer
The numerical solution obtained from CFD is based on solving the discretized form of the governing equations which can be compared with the experimental/theoretical results for validation
Along with the advancement in the numerical investigation of capillary flows [1-3] or heat transfer [4-7] in a multiphase system [8-13], it is crucial to investigate the proficiency of utilized CFD tools at small scales
Summary
Computational Fluid Dynamics (CFD) has been extensively utilized tool in the field of fluid flow and heat transfer. Along with the advancement in the numerical investigation of capillary flows [1-3] or heat transfer [4-7] in a multiphase system [8-13], it is crucial to investigate the proficiency of utilized CFD tools at small scales. We have chosen to study the capillary flow of liquid inside channels of varying height. Liquid flow in channels (mini channels [14-16], microchannels [8, 1718], or nanochannels [19-23]) have been extensively studied in the varying field of applications. The height of the channel is varied from a millimeter to a few nanometers and the effect of the same is studied by comparing it with the theoretical prediction
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