Experimental study of the oscillations of a rotating drop

1985 ◽  
Vol 158 ◽  
pp. 317-327 ◽  
Author(s):  
P. Annamalai ◽  
E. Trinh ◽  
T. G. Wang
Keyword(s):  
Experimental Study ◽  
Analytical Study ◽  
Liquid Drop ◽  
Angular Speed ◽  
Immiscible Fluid ◽  
Drop Shape ◽  
Free Decay ◽  
Resonance Frequencies ◽  
Rotating Liquid ◽  
Relative Change

Two- and three-lobed oscillations of a rotating liquid drop immersed in an immiscible fluid of comparable density and the same angular velocity were studied experimentally. Using acoustically suspended drops, it has been found that the relative change in the resonance frequencies of the axisymmetric drop-shape oscillations Δωl/ωl(0) is proportional to the square of the normalized angular speed (Ω/ωl(0))2 when ωl > 2Ω. This is in agreement with a recent analytical study of the same problem. Some preliminary results regarding the effect of rotation on the free-decay rate of the two-lobed oscillations are also presented.

Equilibrium of liquid drops under the effects of rotation and acoustic flattening: results from USML-2 experiments in Space

1998 ◽  
Vol 354 ◽  
pp. 43-67 ◽  
Author(s):  
C. P. LEE ◽  
A. V. ANILKUMAR ◽  
A. B. HMELO ◽  
T. G. WANG
Keyword(s):  
Experimental Study ◽  
Angular Velocity ◽  
Liquid Drop ◽  
Sound Field ◽  
Theoretical Models ◽  
Liquid Drops ◽  
Complementary Effect ◽  
Rotating Liquid ◽  
Neutral Equilibrium ◽  
Effects Of Rotation

Previous Space-based experiments (Wang et al. 1994a) showed that a rotating liquid drop bifurcates into a two-lobed shape at a lower critical angular velocity, if it is flattened acoustically by the leviating sound field. In this work, we undertake a systematic experimental study of the effect of acoustic flattening on the rotational bifurcation of a liquid drop. We also look into the complementary effect of rotation on the equilibrium of an acoustically drastically flattened drop. Theoretical models are developed for each of the two effects and then woven into a unified picture. The first effect concerns neutral equilibrium, while the second concerns loss of equilibrium, neither of them involving instability. The theories agree well with the experiments.

scholarly journals Experimental study on vibration transmissibility of Pre-loaded XPE and PE packaging cushioning material

2021 ◽  
Vol 49 (4) ◽  
pp. 962-968
Author(s):  
Péter Csavajda ◽  
Péter Böröcz
Keyword(s):  
Experimental Study ◽  
Static Load ◽  
Damping Ratio ◽  
Packaging System ◽  
Static Loads ◽  
Resonance Frequencies ◽  
Vibration Transmissibility ◽  
Protective Packaging ◽  
Load Conditions ◽  
Cushioning Material

Most of the shipped products are sensitive against shock and vibration events during the distribution. Various cushioning materials are usually used to prevent the product damages. During the design process the protective packaging system is developed by the engineers based on the cushion and vibration transmissibility features (ie. cushion curve) of the material used. However, after the assembly of the packaged-product, these are stored for various long periods in warehouse. During this time the products pre-load the cushioning material and its parameters can be changed. The main goal of this study is to evaluate the vibration transmissibility of PE and XPE cushioning material at varied storage (pre-loaded) time and static load conditions. Four different kinds of duration (1 hour, 10 hours, 100 hours and 1000 hours) were used for the pre-loading period at three different static loads (3.488 kPa, 4.651 kPa, and 6.976 kPa), and then at 0.5 oct/min sine sweep vibration the peak frequencies of response and vibration transmissibility, and damping ratio were determined. The results show that the effect of pre-loading is minimal by PE material, but can influence the resonance frequencies by XPE cushioning material. The findings of this study help the packaging engineers to understand better the mechanism of these cushioning materials and to design suitable protective packaging systems.

scholarly journals Experimental measurement and evaluation of the noise generated by three transmissions by synchronous belts of type AT10, BAT10 and SFAT10

2020 ◽  
Author(s):  
Merghache Sidi Mohammed ◽  
Hamdi Amine ◽  
Fernini Brahim
Keyword(s):  
Experimental Study ◽  
Angular Speed ◽  
Direct Transmission ◽  
Engine Torque ◽  
Linear Speed ◽  
Belt Drives ◽  
Impact Noise ◽  
Low Weight ◽  
Measurement And Evaluation ◽  
The Impact

Abstract Synchronous belt drives combine the advantages of simple belt drives (flat, trapezoidal or ridged) due to their low weight, low maintenance, large linear speed ranges and high transmission ratios with the advantages of chains: absence sliding, synchronized transmission of speed, low tensioning, etc. Thanks to the toothing of the belt which enters the corresponding one of the synchronous pulleys, there is direct transmission of the power without sliding as between two gears. This article develops an experimental study which makes it possible to see the influence of the angular speed, the engine torque and the setting tension on the impact noise of the belt teeth on the pulley teeth during meshing and vibrations of the free strands of the belt. We have measured the noise generated by three transmissions by synchronous belts of type AT10, BAT10 and SFAT10.

Experimental study of loss of drop shape stability in a swirling flow

2013 ◽  
Vol 26 (5) ◽  
pp. 391-395 ◽  
Author(s):  
V. A. Arkhipov ◽  
A. P. Berezikov ◽  
V. F. Trofimov ◽  
A. S. Usanina
Keyword(s):  
Experimental Study ◽  
Swirling Flow ◽  
Shape Stability ◽  
Drop Shape

Experimental Study on the Influence of Hull Spacing on Hard-Chine Catamaran Motions

2001 ◽  
Vol 45 (03) ◽  
pp. 216-227
Author(s):  
R. Centeno ◽  
K. S. Varyani ◽  
C. Guedes Soares
Keyword(s):  
Experimental Study ◽  
Cross Flow ◽  
Experimental Program ◽  
Two Dimensional ◽  
Regular Waves ◽  
Viscous Forces ◽  
Motion Responses ◽  
Resonance Frequencies ◽  
Flow Drag ◽  
Wave Induced

An experimental program was performed with hard-chine catamaran models in regular waves. The distance between the demi-hulls of the models was changed to assess its effects on the wave-induced motions. The results allowed the study of some aspects related to catamaran motions, like the interference between the hulls and resonance frequencies. The experimental results are compared with calculations performed with a recently developed code based on a two-dimensional potential flow theory in which viscous forces are included through a cross-flow drag approach. The effect of the hull distance in the heave and pitch motion responses and the importance of the viscous forces in such hull configurations are shown.

scholarly journals Experimental study of loss in stability of the drop shape in the approach air flow

2017 ◽  
Vol 110 ◽  
pp. 01066
Author(s):  
Nikolay Zolotorev ◽  
Ksenia Perfilieva ◽  
Sergey Polenchuk
Keyword(s):  
Experimental Study ◽  
Air Flow ◽  
Drop Shape

The influence of liquid drop shape on crystalline structure of nanowires

2015 ◽  
Vol 41 (12) ◽  
pp. 1189-1191
Author(s):  
N. V. Sibirev ◽  
A. A. Koryakin
Keyword(s):  
Crystalline Structure ◽  
Liquid Drop ◽  
Drop Shape
Sign in / Sign up

Export Citation Format

Share Document