Accession Number : AD1001828


Title :   Direct Optical Measurement of Vorticity in Fluid Flow


Descriptive Note : Technical Report,15 Sep 2014,14 Sep 2015


Corporate Author : Michigan State University East Lansing United States


Personal Author(s) : Koochesfahani,Manoochehr ; Dantus,Marcos


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/1001828.pdf


Report Date : 11 Dec 2015


Pagination or Media Count : 13


Abstract : Even though vorticity is one of the most important variables in fluid dynamics, we do not currently have a practical way to measure it directly and in a non-intrusive fashion. In this exploratory research effort we demonstrate the first direct and localized non-intrusive measurement of vorticity in afluid flow using the Rotational Doppler Effect (RDE) and Laguerre-Gaussian (LG) light beams that possess orbital angular momentum (OAM).The approach has been implemented in the flow field of solid body rotation where the flow vorticity is known precisely. Experimental results arefound to be in excellent agreement with the expected values.


Descriptors :   fluid flow , fluid dynamics , laser beams , angular momentum , flow fields , measurement , images , lasers


Distribution Statement : APPROVED FOR PUBLIC RELEASE