Theoretical study of spilling wave attenuation by air bubbles, turbulence, and bottom friction

2021 ◽  
pp. 107606
Author(s):  
Ashabul Hoque ◽  
Motiur Rahman ◽  
Masudar Rahman ◽  
Nur Hossain ◽  
Gour Chandra Paul
Keyword(s):  
Theoretical Study ◽  
Wave Attenuation ◽  
Bottom Friction ◽  
Air Bubbles

Explanation of the Influence of Inflow Air Content on the Lift of Cavitating Hydrofoils

2018 ◽  
Vol 140 (8) ◽  
Author(s):  
Eduard Amromin
Keyword(s):  
Experimental Data ◽  
Theoretical Study ◽  
Lift Coefficient ◽  
Cavity Surface ◽  
Air Bubbles ◽  
Incoming Flow ◽  
Fluid Density ◽  
Air Content ◽  
Theoretical Results ◽  
Good Agreement

According to several known experiments, an increase of the incoming flow air content can increase the hydrofoil lift coefficient. The presented theoretical study shows that such increase is associated with the decrease of the fluid density at the cavity surface. This decrease is caused by entrainment of air bubbles to the cavity from the surrounding flow. The theoretical results based on such explanation are in a good agreement with the earlier published experimental data for NACA0015.

scholarly journals Interaction acoustic waves with a layered structure containing layer of bubbly liquid

2018 ◽  
Vol 148 ◽  
pp. 15006
Author(s):  
Damir Gubaidullin ◽  
Anatolii Nikiforov
Keyword(s):  
Acoustic Waves ◽  
Theoretical Study ◽  
Bubbly Liquid ◽  
Air Bubbles ◽  
Angle Of Incidence ◽  
Natural Oscillations ◽  
Reflection And Transmission ◽  
Transmission Coefficients ◽  
Gel Layer ◽  
Transmission And Reflection

The results of a theoretical study of the effect of a bubble layer on the propagation of acoustic waves through a thin three-layered barrier at various angles of incidence are presented. The barrier consists of a layer of gel with polydisperse air bubbles bounded by layers of polycarbonate. It is shown that the presence of polydisperse air bubbles in the gel layer significantly changes the transmission and reflection of the acoustic signal when it interacts with such an obstacle for frequencies close to the resonant frequency of natural oscillations of the bubbles. The frequency range is identified where the angle of incidence has little effect on the reflection and transmission coefficients of acoustic waves.

Spectral Wave Attenuation by Bottom Friction: Theory

1989 ◽  
Author(s):  
Ole Secher Madsen ◽  
Ying-Keung Poon ◽  
Hans C. Graber
Keyword(s):  
Wave Attenuation ◽  
Bottom Friction ◽  
Friction Theory

scholarly journals An extension of Fuhrboter's studies for wave height: a theoretical study

1970 ◽  
Vol 34 (2) ◽  
pp. 115-122
Author(s):  
Azizur Rahman ◽  
MST Kamrunnaher ◽  
Ashabul Hoque
Keyword(s):  
Key Words ◽  
Wave Height ◽  
Theoretical Study ◽  
Air Entrainment ◽  
Air Bubbles ◽  
Air Bubble ◽  
Bubble Entrainment ◽  
Air Bubble Entrainment ◽  
Spilling Breakers ◽  
Academy Of Sciences

This theoretical study extends Fuhrboter's work and includes the effects of air bubble entrainment. Result shows that there is a correlation between the sudden reductions of wave height and entrained of air bubbles into the water. Moreover, the study reveals that air entrainment occurs very short way in plunging breakers comparatively to spilling breakers. Key words: Fuhrboter's studies; Wave height; Theoretical study DOI: 10.3329/jbas.v34i2.6855Journal of Bangladesh Academy of Sciences, Vol. 34, No. 2, 115-122, 2010

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