Free flight measurements of catastrophic water drop breakup

AIAA Journal ◽  
1976 ◽  
Vol 14 (11) ◽  
pp. 1635-1636 ◽  
Author(s):  
W. G. Reinecke ◽  
W. L. McKay
Keyword(s):  
Water Drop ◽  
Drop Breakup ◽  
Free Flight ◽  
Flight Measurements

scholarly journals Investigation of mechanisms leading to water drop breakup at Mach 4.4 and Weber numbers above 105

2019 ◽  
Vol 2 (1) ◽  
Author(s):  
David Hébert ◽  
Jean-Luc Rullier ◽  
Jean-Marc Chevalier ◽  
Isabelle Bertron ◽  
Emilien Lescoute ◽  
...  
Keyword(s):  
Water Drop ◽  
Drop Breakup

scholarly journals The influence of sensory delay on the yaw dynamics of a flapping insect

2011 ◽  
Vol 9 (72) ◽  
pp. 1685-1696 ◽  
Author(s):  
Michael J. Elzinga ◽  
William B. Dickson ◽  
Michael H. Dickinson
Keyword(s):  
Feedback System ◽  
System Response ◽  
Feedback Gain ◽  
Free Flight ◽  
Closed Loop Systems ◽  
Tethered Flight ◽  
Body Dynamics ◽  
And Performance ◽  
Proportional Controller ◽  
Flight Measurements

In closed-loop systems, sensor feedback delays may have disastrous implications for performance and stability. Flies have evolved multiple specializations to reduce this latency, but the fastest feedback during flight involves a delay that is still significant on the timescale of body dynamics. We explored the effect of sensor delay on flight stability and performance for yaw turns using a dynamically scaled robotic model of the fruitfly, Drosophila . The robot was equipped with a real-time feedback system that performed active turns in response to measured torque about the functional yaw axis. We performed system response experiments for a proportional controller in yaw velocity for a range of feedback delays, similar in dimensionless timescale to those experienced by a fly. The results show a fundamental trade-off between sensor delay and permissible feedback gain, and suggest that fast mechanosensory feedback in flies, and most probably in other insects, provide a source of active damping which compliments that contributed by passive effects. Presented in the context of these findings, a control architecture whereby a haltere-mediated inner-loop proportional controller provides damping for slower visually mediated feedback is consistent with tethered-flight measurements, free-flight observations and engineering design principles.

A numerical study of hollow water drop breakup during freezing

2021 ◽  
Vol 33 (11) ◽  
pp. 112110
Author(s):  
Truong V. Vu ◽  
Binh D. Pham ◽  
Phuc H. Pham ◽  
Hung V. Vu ◽  
Bo X. Tran
Keyword(s):  
Numerical Study ◽  
Water Drop ◽  
Drop Breakup
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