A cryogenic-helium pipe flow facility with unique double-line molecular tagging velocimetry capability
نویسندگان
چکیده
منابع مشابه
Molecular tagging velocimetry in turbulence using biacetyl.
We evaluate various molecular tagging velocimetry (MTV) techniques for application in turbulent flows of gases where the smallest length scales must be resolved. We argue that tracer diffusion dictates the use of large complex molecules and discuss a few candidate molecules. The accuracy of MTV is determined by the profile of written lines which widen due to molecular dynamics, including both d...
متن کاملChapter 4 Molecular Tagging Velocimetry and Thermometry
The advent of the laser as a relatively common tool for flow visualization has stimulated the development of velocimetry techniques based on the use of photosensitive molecules. While a variety of different molecules have been employed for this purpose, they share the common attribute that laser excitation is used to produce a defined pattern of long-lived tracers which are embedded within the ...
متن کاملHydroxyl tagging velocimetry in a supersonic flow over a cavity.
Hydroxyl tagging velocimetry (HTV) measurements of velocity were made in a Mach 2 (M 2) flow with a wall cavity. In the HTV method, ArF excimer laser (193 nm) beams pass through a humid gas and dissociate H2O into H + OH to form a tagging grid of OH molecules. In this study, a 7 x 7 grid of hydroxyl (OH) molecules is tracked by planar laser-induced fluorescence. The grid motion over a fixed tim...
متن کاملMolecular tagging velocimetry measurements of axial flow in a concentrated vortex core
The characteristics of the axial flow within the core of a concentrated line vortex are investigated using molecular tagging velocimetry (MTV). A well-defined array of isolated vortices of alternating sign is generated in the wake of a NACA-0012 airfoil pitching sinusoidally at small amplitude and high reduced frequencies. The circulation and peak vorticity of the vortices are varied by the cho...
متن کاملDevelopment of a Temperature Measurement Technique Using Molecular Tagging Velocimetry
A summary of the development of a method of measuring fluid temperature with a laser is presented. The method is based on molecular tagging velocimetry (MTV), an established technique of obtaining spatiallyresolved fluid velocity profiles by analysis of laserinduced molecular phosphorescence emitted by photoluminescent chemicals. In aqueous solutions the intensity of the phosphorescent emission...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Review of Scientific Instruments
سال: 2020
ISSN: 0034-6748,1089-7623
DOI: 10.1063/5.0008117