NUMERICAL STUDY OF GASEOUS FLOW IN DIVERGENT MICRO/NANOCHANNELS

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EBRAHIMI AMIN; Roohi Ehsan

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Seminar Paper

Paper Information

Seminar: CONFERENCE OF IRANIAN AEROSPACE SOCIETY
Year:2015 | Issue:14

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Title

NUMERICAL STUDY OF GASEOUS FLOW IN DIVERGENT MICRO/NANOCHANNELS

Author(s)

EBRAHIMI AMIN | Roohi Ehsan

Keywords

MICRO/NANOFLOWS

DSMC

SIMPLIFIED BERNOULLI-TRIALS (SBT)

PRESSURE-DRIVEN FLOW

DIVERGENT MICRO/NANOCHANNELS

Abstract

THE RAREFIED GAS FLOW THROUGH DIVERGENT MICRO/NANO CHANNELS IS NUMERICALLY STUDIED USING A PARTICLE-BASED METHOD, DIRECT SIMULATION MONTE-CARLO (DSMC). SIMPLIFIED BERNOULLI-TRIALS (SBT) COLLISION SCHEME IS EMPLOYED AS COLLISION PARTNER SELECTION METHOD. THE SIMULATIONS ARE PERFORMED FOR NITROGEN GAS FLOWING THROUGH DIVERGENT NANOCHANNELS WITH VARIOUS DIVERGENCE ANGLES (0O, 4O, 8O, 12O AND 16O). THE KNUDSEN NUMBER FALLS IN THE SLIP AND EARLY-TRANSITION REGIMES (0.03£KNI £0.2) AND INLET-TO-OUTLET PRESSURE RATIO IS SET TO THREE. THE CENTERLINE PRESSURE AND MACH NUMBER DISTRIBUTIONS ARE PROVIDED FOR VARIOUS KNUDSEN NUMBERS AND DIVERGENCE ANGLES. ADDITIONALLY, THE CONTOURS OF PRESSURE AND MACH NUMBER ARE PRESENTED FOR DIFFERENT DIVERGENCE ANGLES. THE RESULTS INDICATE THAT THE RAREFICATION EFFECTS AND CENTERLINE AND SLIP VELOCITY INCREASE BY INCREASING THE DIVERGENT ANGLE; WHILE, THE CENTERLINE PRESSURE DECREASES BY AN INCREASE IN DIVERGENCE ANGLE. IT IS FOUND THAT THERE IS NO REVERSAL FLOW FOR RAREFIED GAS FLOW THROUGH DIVERGENT MICRO/NANOCHANNELS. THESE RESULTS ON RAREFIED GASEOUS FLOW THROUGH DIVERGENT NANOCHANNELS ARE CONSIDERABLY DIFFERENT THAN THEIR CONTINUUM COUNTERPARTS.

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APA: Copy

EBRAHIMI, AMIN, & Roohi, Ehsan. (2015). NUMERICAL STUDY OF GASEOUS FLOW IN DIVERGENT MICRO/NANOCHANNELS. CONFERENCE OF IRANIAN AEROSPACE SOCIETY. SID. https://sid.ir/paper/945737/en

Vancouver: Copy

EBRAHIMI AMIN, Roohi Ehsan. NUMERICAL STUDY OF GASEOUS FLOW IN DIVERGENT MICRO/NANOCHANNELS. 2015. Available from: https://sid.ir/paper/945737/en

IEEE: Copy

AMIN EBRAHIMI, and Ehsan Roohi, “NUMERICAL STUDY OF GASEOUS FLOW IN DIVERGENT MICRO/NANOCHANNELS,” presented at the CONFERENCE OF IRANIAN AEROSPACE SOCIETY. 2015, [Online]. Available: https://sid.ir/paper/945737/en

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