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Asymmetric viscothermal acoustic propagation and implication on flow measurement for SOFC
- Source :
- AIP Advances, Vol 9, Iss 8, Pp 085014-085014-13 (2019)
- Publication Year :
- 2019
- Publisher :
- AIP Publishing, 2019.
-
Abstract
- In the applications of heating generation based on the solid oxide fuel cells (SOFC) technology, a high-accuracy performance of flow measurement is of great importance. Due to the advantage of non-invasive no-moving-parts construction and bi-direction measurement, ultrasonic flow meter, where viscothermal dissipation and asymmetric acoustic modes cannot be overlooked, may be a promising method in the SOFC-based applications. The present paper mathematically formulates asymmetric linear disturbance dynamics in terms of velocity and temperature disturbances based on the conservations of mass, momentum and energy. An iterative calculation procedure, which is similar to Galerkin method, is presented. Numerical analysis of asymmetric acoustic features (phase velocity and attenuation coefficient) are comprehensively given under the effects of viscothermal dissipation and shear flow convection. In the end, flow measurement performance of asymmetric acoustic modes is literally discussed. Numerical study shows that viscothermal dissipation affects the cut-on frequency of acoustic modes and couples nonlinearly with shear convection when the flow Mach number is large. These parameters impose significant influences on measurement performance. Each acoustic mode has inherent measurement derivation which can be theoretically used to compensate the acoustic flow measurement error. Apparent prediction error may occur if the viscothermal dissipation is taken out of consideration.
- Subjects :
- 010302 applied physics
Physics
Flow (psychology)
General Physics and Astronomy
02 engineering and technology
Mechanics
Dissipation
021001 nanoscience & nanotechnology
01 natural sciences
lcsh:QC1-999
Flow measurement
symbols.namesake
Mach number
Ultrasonic flow meter
0103 physical sciences
symbols
Phase velocity
0210 nano-technology
Galerkin method
Shear flow
lcsh:Physics
Subjects
Details
- ISSN :
- 21583226
- Volume :
- 9
- Database :
- OpenAIRE
- Journal :
- AIP Advances
- Accession number :
- edsair.doi.dedup.....a6a0411651002f32847a36c2b33bd679