Investigation of thermal creep flow in divergent micro/nanochannels

عنوان به زبان ديگر

پديدآورندگان

Mozaffari Mohammad Sajjad Sajjad.mozaffari@gmail.com High Performance Computing (HPC) Laboratory, Department of Mechanical Engineering, Ferdowsi University of Mashhad, P.O. Box 91775-1111, Mashhad, Iran. , Roohi Ehsan e.roohi@um.ac.ir Associate Proefssor, Department of Mechanical Eng., Ferdowsi University of Mashhad

تعداد صفحه

10

كليدواژه

DSMC , Divergent micro , nano channel , Mass flow rate , Thermal creep

سال انتشار

1396

عنوان كنفرانس

هفدهمين كنفرانس ملي ديناميك شاره ها

زبان مدرك

انگليسي

چكيده فارسي

This paper presents an investigation of flow field and the mass flow rate of rarefied gaseous flow in divergent micro/nano channels compared with the results mass flow rate of straight channels. Direct simulation Monte-Carlo (DSMC) method is used to solve rarefied flow over a wide range of Knudsen number accurately. The results show Mach number increase in straight channels and then decrease with an increase divergence angle. We observed that the mass flow rate increases with the divergence angle. The effect of channel aspect ratio (AR) is not crucial on the mass flow rate in lower Knudsen numbers. However, the mass flow rate increases with the divergence angle when Knudsen number is high. We show that enhanced thermal creep effect is the main source of the mass flow rate increase if the wall temperature gradient is increased. .

چكيده لاتين

This paper presents an investigation of flow field and the mass flow rate of rarefied gaseous flow in divergent micro/nano channels compared with the results mass flow rate of straight channels. Direct simulation Monte-Carlo (DSMC) method is used to solve rarefied flow over a wide range of Knudsen number accurately. The results show Mach number increase in straight channels and then decrease with an increase divergence angle. We observed that the mass flow rate increases with the divergence angle. The effect of channel aspect ratio (AR) is not crucial on the mass flow rate in lower Knudsen numbers. However, the mass flow rate increases with the divergence angle when Knudsen number is high. We show that enhanced thermal creep effect is the main source of the mass flow rate increase if the wall temperature gradient is increased.

كشور

ايران