Prediction of micro-channel flows using direct simulation Monte Carlo

Han, Xue; Qing, Fan; Chen, Shu

doi:10.1016/s0266-8920(99)00023-5

Cited by 54 publications

(25 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…LBM is therefore better suited for gas flow in microchannels as compared to the conventional Navier-Stokes solvers. Alternate techniques to solve microflows such as direct simulation Monte Carlo [17,28] are very expensive because of the high computational cost and time required to achieve any practical resolution [2].…”

Section: Lattice Boltzmann Methods For Microfluidicsmentioning

confidence: 99%

Simulation of gas flow in microchannels with a single bend

Agrawal¹,

Djenidi

Agrawal

2009

Computers & Fluids

View full text Add to dashboard Cite

Section: Lattice Boltzmann Methods For Microfluidicsmentioning

confidence: 99%

Simulation of gas flow in microchannels with a single bend

Agrawal¹,

Djenidi

Agrawal

2009

Computers & Fluids

View full text Add to dashboard Cite

“…The other popular technique to simulate microflows is direct simulation Monte Carlo. 10,11 However, the primary problem with this technique is that it is prohibitively expensive because of the high computational cost and time requirement to achieve any practical resolution. 3 We have chosen the fluid to be a gas in this study because the Knudsen number for gas flow in microducts is relatively large, leading to slip at the walls that is apparently responsible for several new and unexplored phenomena.…”

Section: Andmentioning

confidence: 99%

Three-dimensional simulation of gaseous slip flow in different aspect ratio microducts

Agrawal¹,

Agrawal

2006

Physics of Fluids

View full text Add to dashboard Cite

Three-dimensional lattice Boltzmann method based simulations of a microduct have been undertaken in this paper. The objectives are to understand the different physical phenomena occurring at these small scales and to investigate when the flow can be treated as two dimensional. Toward this end, the Knudsen number and aspect ratio (depth to width ratio) are varied for a fixed pressure ratio. The pressure in the microduct is nonlinear with the nonlinearity in pressure reducing with an increase in the Knudsen number. The pressure behaves somewhat similar to two-dimensional microchannels, even when the aspect ratio is unity. The slip velocity at the impenetrable wall has two components: along and perpendicular to the primary flow direction. Our results show that the streamwise velocity near the centerline is relatively invariant along the depth for an aspect ratio of more than three, suggesting that the microduct can be modeled as a two-dimensional microchannel. On the other hand, the velocity component along the depth is never identically zero, implying that the flow is not truly two dimensional, although for practical purposes a two-dimensional treatment might suffice. A curious change in the vector direction in a plane normal to the flow direction is observed around an aspect ratio of four. These three-dimensional results are significant because they will help in theoretical development and flow modeling at microscales.

show abstract

“…The micro/nano-Couette flow has been widely applied in existing literature for different purposes. Some of the sample works can be found in [7][8][9][10][11][12][13][14]. Meanwhile, entropy and entropy generation concepts are wildly used in the literature for different important purposes such as: evaluating a system's irreversibility, optimizing a thermodynamic system or as a means of examining continuum breakdown in rarefied fluids.…”

Section: Introductionmentioning

confidence: 99%

Compressibility and rarefaction effects on entropy and entropy generation in micro/nano Couette flow using DSMC

Ejtehadi

Esfahani

Roohi³

2012

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

Abstract. In the present work, compressible flow of argon gas in the famous problem of Couette flow in micro/nano-scale is considered and numerically analyzed using the direct simulation Monte Carlo (DSMC) method. The effects of compressibility and rarefaction on entropy and entropy generation in terms of viscous dissipation and thermal diffusion are studied in a wide range of Mach and Knudsen numbers and the observed physics are discussed. In this regard, we computed entropy by using its kinetic theory formulation in a microscopic way while the entropy generation distribution is achieved by applying a semi-microscopic approach and thoroughly free from equilibrium assumptions. The results of our simulations demonstrated that the entropy profiles are in accordance with the temperature profiles. It is also illustrated that the increase of Mach number will result in non-uniform entropy profiles with increase in the vicinity of the central regions of the channel. Moreover, generation of entropy in all regions of the domain stages clear growth. By contrast, increasing the Knudsen number has inverse effects such as: uniform entropy profiles and a falling off in entropy generation amount throughout the channel.

show abstract

Prediction of micro-channel flows using direct simulation Monte Carlo

Cited by 54 publications

References 10 publications

Simulation of gas flow in microchannels with a single bend

Simulation of gas flow in microchannels with a single bend

Three-dimensional simulation of gaseous slip flow in different aspect ratio microducts

Compressibility and rarefaction effects on entropy and entropy generation in micro/nano Couette flow using DSMC

Contact Info

Product

Resources

About