2010
DOI: 10.1007/s10404-010-0671-7
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Study of subsonic–supersonic gas flow through micro/nanoscale nozzles using unstructured DSMC solver

Abstract: We use an extended direct simulation Monte Carlo (DSMC) method, applicable to unstructured meshes, to numerically simulate a wide range of rarefaction regimes from subsonic to supersonic flows through micro/nanoscale converging-diverging nozzles. Our unstructured DSMC method considers a uniform distribution of particles, employs proper subcell geometry, and follows an appropriate particle tracking algorithm. Using the unstructured DSMC, we study the effects of back pressure, gas/surface interactions (diffuse/s… Show more

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Cited by 80 publications
(33 citation statements)
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“…T =ṁ e u e (7) where ṁ e and u e are the mass flow rate and velocity values, respectively. In addition, subscript 'e' refers to the nozzle exit section.…”
Section: ≈1mentioning
confidence: 99%
See 1 more Smart Citation
“…T =ṁ e u e (7) where ṁ e and u e are the mass flow rate and velocity values, respectively. In addition, subscript 'e' refers to the nozzle exit section.…”
Section: ≈1mentioning
confidence: 99%
“…The behavior was investigated for two conditions, single and array patterns of nozzles. Darbandi and Roohi [7] studied the effects of gas/surface interactions (diffuse/specular reflections) and Knudsen number on the flow field in micro/nanoscale nozzles. Sebastião et al [8,9] simulated arrayarranged convergent-divergent micro nozzles by using DSMC.…”
Section: Introductionmentioning
confidence: 99%
“…This additional momentum transfer can be accounted for by introducing a roughness-viscosity in a manner similar to the eddy-viscosity concept in the turbulent flow model. Darbandi et al [10] study the effects gas/surface interactions on the flow field in micro/nanoscale nozzles and show that a high viscous force creation in the wall boundary layer prevents any supersonic flow formation in the divergent part of the nozzle. Li et al [11] considered surface roughness effects on gas flows through long microtubes.…”
Section: Introductionmentioning
confidence: 99%
“…Due to expansion of flow in the divergent section, the rarefied region is increased toward the end of nozzle. It is demonstrated by Darbandi and Roohi (2011) that solving the flow using the NS solver in the divergent section is not accurate even in the centerline. Therefore, the DSMC solver is used to simulate the entire divergent section and the NS solver is used for simulation of the convergent section of the micronozzle.…”
Section: Dsmc/ns Solver Validationmentioning
confidence: 99%