scholarly journals Study of Deformation and Breakup of Submillimeter Droplets’ Spray in a Supersonic Nozzle Flow

2020 ◽  
Vol 10 (18) ◽  
pp. 6149
Author(s):  
Oleg A. Gobyzov ◽  
Mikhail N. Ryabov ◽  
Artur V. Bilsky
Keyword(s):  
High Speed ◽  
Particle Image ◽  
Supersonic Nozzle ◽  
Stress Effect ◽  
Size Distributions ◽  
Flow Measurements ◽  
Image Velocimetry ◽  
Accelerated Flow ◽  
High Speed Flows ◽  
Breakup Mode

The problem of secondary atomization of droplets is crucial for many applications. In high-speed flows, fine atomization usually takes place, and the breakup of small droplets determines the final products of atomization. An experimental study of deformation and breakup of 15–60 µm size droplets in an accelerated flow inside a converging–diverging nozzle is considered in the paper. Particle image velocimetry and shadow photography were employed in the experiments. Results of gas and liquid phase flow measurements and visualization are presented and analyzed, including gas and droplets’ velocity, shape and size distributions of droplets. Weber numbers for droplets’ breakup are reported. For those small droplets at low Weber numbers, the presence of well-known droplets’ breakup morphology is confirmed, and rare “pulling” breakup mode is detected and qualitatively described. For the “pulling” breakup mode, a consideration, explaining its development in smaller droplets through shear stress effect, is provided.

Digital video camera for application of particle image velocimetry in high-speed flows

1995 ◽  
Author(s):  
Christian Willert ◽  
Boleslaw Stasicki ◽  
Markus Raffel ◽  
Juergen Kompenhans
Keyword(s):  
Particle Image Velocimetry ◽  
High Speed ◽  
Digital Video ◽  
Particle Image ◽  
Video Camera ◽  
Digital Video Camera ◽  
Image Velocimetry ◽  
High Speed Flows

Application of on-line particle image velocimetry to high-speed flows

1993 ◽  
Author(s):  
Luiz M. Lourenco ◽  
A. Krothapalli
Keyword(s):  
Particle Image Velocimetry ◽  
High Speed ◽  
Particle Image ◽  
Image Velocimetry ◽  
On Line ◽  
High Speed Flows

scholarly journals Aerodynamics of manoeuvring flight in brown long-eared bats ( Plecotus auritus )

2018 ◽  
Vol 15 (148) ◽  
pp. 20180441 ◽  
Author(s):  
Per Henningsson ◽  
Lasse Jakobsen ◽  
Anders Hedenström
Keyword(s):  
Particle Image Velocimetry ◽  
Wind Tunnel ◽  
High Speed ◽  
Particle Image ◽  
Future Studies ◽  
Image Velocimetry ◽  
Mechanistic Basis

In this study, we explicitly examine the aerodynamics of manoeuvring flight in animals. We studied brown long-eared bats flying in a wind tunnel while performing basic sideways manoeuvres. We used particle image velocimetry in combination with high-speed filming to link aerodynamics and kinematics to understand the mechanistic basis of manoeuvres. We predicted that the bats would primarily use the downstroke to generate the asymmetries for the manoeuvre since it has been shown previously that the majority of forces are generated during this phase of the wingbeat. We found instead that the bats more often used the upstroke than they used the downstroke for this. We also found that the bats used both drag/thrust-based and lift-based asymmetries to perform the manoeuvre and that they even frequently switch between these within the course of a manoeuvre. We conclude that the bats used three main modes: lift asymmetries during downstroke, thrust/drag asymmetries during downstroke and thrust/drag asymmetries during upstroke. For future studies, we hypothesize that lift asymmetries are used for fast turns and thrust/drag for slow turns and that the choice between up- and downstroke depends on the timing of when the bat needs to generate asymmetries.

scholarly journals Dual-camera system for high-speed imaging in particle image velocimetry

2012 ◽  
Vol 15 (3) ◽  
pp. 193-195 ◽  
Author(s):  
K. Hashimoto ◽  
A. Hori ◽  
T. Hara ◽  
S. Onogi ◽  
H. Mouri
Keyword(s):  
Particle Image Velocimetry ◽  
High Speed ◽  
Particle Image ◽  
High Speed Imaging ◽  
Camera System ◽  
Image Velocimetry

scholarly journals Study of fish response using particle image velocimetry and high-speed, high-resolution imaging

2004 ◽  
Author(s):  
Z. Deng ◽  
M. C. Richmond ◽  
R. P. Mueller ◽  
G. R. Gruensch
Keyword(s):  
Particle Image Velocimetry ◽  
High Resolution ◽  
High Speed ◽  
Particle Image ◽  
High Resolution Imaging ◽  
Image Velocimetry ◽  
Resolution Imaging ◽  
Fish Response
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