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Precise thermodynamic control of high pressure jet expansions.
- Source :
-
The Review of scientific instruments [Rev Sci Instrum] 2007 Jul; Vol. 78 (7), pp. 073106. - Publication Year :
- 2007
-
Abstract
- We describe an experimental setup for supersonic jet expansions of supercritical fluids. It is characterized by well-defined thermodynamic values to allow systematic investigations of pressure and temperature effects on molecular beam parameters. The design permits stagnation temperatures T(0)=225-425 K with a thermal stability DeltaT(0)<30 mK and stagnation pressures p(0)=0.2-12 MPa that are measured with 0.05% precision. For optimum stability, gas reservoir, pressure transducer, and gauge amplifier are temperature-controlled, and a feedback loop permits active pressure stabilization using a pulseless syringe pump. With this approach stagnation pressures can be reproduced and kept constant to Deltap(0)<2.9 kPa. As a result, flow velocity and kinetic energy of molecular beams can be controlled with maximum accuracy.
- Subjects :
- Equipment Design
Equipment Failure Analysis
Flow Injection Analysis methods
Heating methods
Manometry methods
Microfluidics methods
Pressure
Reproducibility of Results
Sensitivity and Specificity
Thermodynamics
Thermography methods
Flow Injection Analysis instrumentation
Heating instrumentation
Manometry instrumentation
Microfluidics instrumentation
Thermography instrumentation
Subjects
Details
- Language :
- English
- ISSN :
- 0034-6748
- Volume :
- 78
- Issue :
- 7
- Database :
- MEDLINE
- Journal :
- The Review of scientific instruments
- Publication Type :
- Academic Journal
- Accession number :
- 17672754
- Full Text :
- https://doi.org/10.1063/1.2756630