NDLI: Sonic Point Position and Critical Pressure Ratio in Micro Nozzle

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	He, Feng Hao, Peng-Fei Ding, Ying-Tao Yao, Zhao-Hui
Copyright Year	2005
Abstract	The performance of the micro propulsion system is determined primarily by the performance of the micro nozzles. 3D rectangular cross-section straight-convergent-divergent-straight (SCDS) micro nozzle, with throat width 16 μm and throat depth 20 μm, was fabricated and studied based on the experiment and numerical simulation. The results indicate that the first sonic point position moves away from the throat to the outlet of the microchannels, and the critical pressure ratio (defined as the local static pressure to inlet total pressure ratio when the first sonic point occurs in the internal flow of SCDS microchannel) decreases with the increasing of the S/V (surface-to-volume ratio) of micro nozzle. These behaviors might be attributed to the increased surface-to-volume ratio leads to high viscosity dissipation in micro nozzle. The relationship of critical pressure ratio and the S/V ratio is further discussed based on numerical simulation.
Sponsorship	Nanotechnology Institute
Starting Page	375
Ending Page	379
Page Count	5
File Format	PDF
ISBN	0791841855
DOI	10.1115/ICMM2005-75135
e-ISBN	0791837580
Volume Number	ASME 3rd International Conference on Microchannels and Minichannels, Parts A and B
Conference Proceedings	ASME 3rd International Conference on Microchannels and Minichannels
Language	English
Publisher Date	2005-06-13
Publisher Place	Toronto, Ontario, Canada
Access Restriction	Subscribed
Subject Keyword	Viscosity Micronozzles Internal flow Computer simulation Energy dissipation Pressure Propulsion systems Microchannels
Content Type	Text
Resource Type	Article

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