Abonnement à la biblothèque: Guest
Portail numérique Bibliothèque numérique eBooks Revues Références et comptes rendus Collections
Atomization and Sprays
Facteur d'impact: 1.262 Facteur d'impact sur 5 ans: 1.518 SJR: 0.814 SNIP: 1.18 CiteScore™: 1.6

ISSN Imprimer: 1044-5110
ISSN En ligne: 1936-2684

Volumes:
Volume 29, 2019 Volume 28, 2018 Volume 27, 2017 Volume 26, 2016 Volume 25, 2015 Volume 24, 2014 Volume 23, 2013 Volume 22, 2012 Volume 21, 2011 Volume 20, 2010 Volume 19, 2009 Volume 18, 2008 Volume 17, 2007 Volume 16, 2006 Volume 15, 2005 Volume 14, 2004 Volume 13, 2003 Volume 12, 2002 Volume 11, 2001 Volume 10, 2000 Volume 9, 1999 Volume 8, 1998 Volume 7, 1997 Volume 6, 1996 Volume 5, 1995 Volume 4, 1994 Volume 3, 1993 Volume 2, 1992 Volume 1, 1991

Atomization and Sprays

DOI: 10.1615/AtomizSpr.v19.i5.30
pages 445-456

DEMONSTRATION OF DIGITAL HOLOGRAPHIC DIAGNOSTICS FOR THE BREAKUP OF LIQUID JETS USING A COMMERCIAL-GRADE CCD SENSOR

J. Lee
Oklahoma State University, School of Mechanical and Aerospace Engineering, 218 Engineering North, Stillwater, OK 74078, USA
B. Miller
Oklahoma State University, School of Mechanical and Aerospace Engineering, 218 Engineering North, Stillwater, OK 74078, USA
Khaled A. Sallam
School of Mechanical and Aerospace Engineering, Oklahoma State University, Tulsa, OK 74106, USA

RÉSUMÉ

Digital holography was used for drop size and velocity measurements during the breakup of liquid jets because it is unaffected by the nonspherical droplets that are encountered very close to the injector exit, which would otherwise cause problems for techniques such as the phase Doppler particle analyzer. It also works well for observing the very dense spray conditions that are encountered just downstream of the injector exit. In view of the recent advancement in digital holography, the objective of this study was to develop an inexpensive method that provides visualization and measurements of droplet sizes and velocities of a micro-liquid jet. In the present experimental setup, two Nd:YAG lasers are used to generate two independent laser pulses. A commercial CCD sensor (Nikon D-70, ∼$700) is used for recording holograms of micro-liquid jets. By using the commercial-grade CCD sensor instead of research-grade PIV CCD camera for holographic diagnostics, the cost of recording holograms has been reduced from $20K to $0.5K. For the velocity measurement, unlike the case when using a PIV-CCD camera, two images were recorded on the same frame. The in-line holography arrangement reduces the spatial resolution requirements on the CCD sensor, which typically has a much lower resolution than traditional holographic plates. Digital microscopic holography is similar to standard digital in-line holography except that no lens is used to collimate the object beam. The laser beams are expanded with an objective lens (M 5×) and a spatial filter (15 μm pinhole). This eliminates two lenses from the typical optical path used for in-line holography, which results in a much cleaner hologram recording. Moreover, the expanding beam increases the resolution of the setup because the fringes that are needed to reconstruct the image are expanding with the expanding laser beam. As the recording distance is shortened, the resolution is increased.


Articles with similar content:

DIGITAL PTV MEASUREMENTS OF A SEPARATED AIR FLOW BEHIND A BACKWARD-FACING STEP
Journal of Flow Visualization and Image Processing, Vol.1, 1993, issue 4
Koichi Nishino, Kahoru Torii, Toshiaki Adachi
A REVIEW ON DIGITAL PTV MEASUREMENTS OF A SEPARATED AIR FLOW BEHIND A BACKWARD-FACING STEP
Journal of Flow Visualization and Image Processing, Vol.24, 2017, issue 1-4
Koichi Nishino, Kahoru Torii, Toshiaki Adachi
EXPERIMENTAL STUDIES ON THE BEHAVIOUR OF COAXIAL ROCKET INJECTOR SPRAYS
ICLASS 94
Proceedings of the Sixth International Conference on Liquid Atomization and Spray Systems, Vol.0, 1994, issue
S. V. Sankar, W.D. Bachalo, J. Y. Zhu
HIGHLY PRECISE CORRELATION ESTIMATES OF TURBULENT SHEER FLOWS USING A NOVEL LASER DOPPLER PROFILE SENSOR
TSFP DIGITAL LIBRARY ONLINE, Vol.6, 2009, issue
K. Shirai, Mathias Neumann, Andreas Voigt, Jurgen Czarske, Lars Buttner
Spray Characterization Using a Planar Droplet Sizing Technique
International Journal of Fluid Mechanics Research, Vol.24, 1997, issue 4-6
K. E. Maher, S. V. Sankar, William Bachalo, D. M. Robart