NDLI: Performance Predictions of MEMS-Based Nozzles at Moderate or Low Temperatures

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Wang, Moran Li, Zhixin
Copyright Year	2004
Abstract	Performance of MEMS-based nozzles at moderate and low temperatures is numerically analyzed using the direct simulation Monte Carlo method. Considering the intermolecular attractive potential due to low temperature, the generalized soft sphere collision model is introduced. The Larsen-Borgnakke model for the generalized sphere model is used to model the energy exchange between the translational and internal modes. The results for nozzle flows at an initial temperature of 300 K show that the temperature behind the throat is quite low and the intermolecular attractive potential cannot be ignored. Different working conditions in two-dimensional nozzles are simulated using the present method, including exit pressure, inlet pressure, initial temperature, nozzle geometry, and gas species. The effect factors on the nozzle performance are analyzed. A 3D nozzle flow simulation shows the increased surface-to-volume ratio which leads to high viscosity dissipation cause a much lower flow characteristic and performance comparing with the 2D case.
Sponsorship	Nanotechnology Institute
Starting Page	731
Ending Page	738
Page Count	8
File Format	PDF
ISBN	0791841642
DOI	10.1115/ICMM2004-2405
Volume Number	ASME 2nd International Conference on Microchannels and Minichannels
Conference Proceedings	ASME 2004 2nd International Conference on Microchannels and Minichannels
Language	English
Publisher Date	2004-06-17
Publisher Place	Rochester, New York, USA
Access Restriction	Subscribed
Subject Keyword	Microelectromechanical systems Viscosity Temperature Flow (dynamics) Pressure Geometry Collisions (physics) Flow simulation Monte carlo methods Simulation Energy dissipation Nozzles Low temperature
Content Type	Text
Resource Type	Article

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