Sonoluminescence, sonochemistry and bubble dynamics of single bubble cavitation

2012 ◽  
Author(s):  
Shin-ichi Hatanaka
Keyword(s):  
Bubble Dynamics ◽  
Single Bubble ◽  
Bubble Cavitation

Towards the concept of hydrodynamic cavitation control

1997 ◽  
Vol 332 ◽  
pp. 377-394 ◽  
Author(s):  
Dhiman Chatterjee ◽  
Vijay H. Arakeri
Keyword(s):  
Acoustic Field ◽  
Bubble Dynamics ◽  
Hydrodynamic Cavitation ◽  
Careful Study ◽  
Potential Control ◽  
Cavitation Phenomenon ◽  
Bubble Cavitation ◽  
First Results ◽  
Hydrodynamic Field ◽  
Pass Through

A careful study of the existing literature available in the field of cavitation reveals the potential of ultrasonics as a tool for controlling and, if possible, eliminating certain types of hydrodynamic cavitation through the manipulation of nuclei size present in a flow. A glass venturi is taken to be an ideal device to study the cavitation phenomenon at its throat and its potential control. A piezoelectric transducer, driven at the crystal resonant frequency, is used to generate an acoustic pressure field and is termed an ‘ultrasonic nuclei manipulator (UNM)'. Electrolysis bubbles serve as artificial nuclei to produce travelling bubble cavitation at the venturi throat in the absence of a UNM but this cavitation is completely eliminated when a UNM is operative. This is made possible because the nuclei, which pass through the acoustic field first, cavitate, collapse violently and perhaps fragment and go into dissolution before reaching the venturi throat. Thus, the potential nuclei for travelling bubble cavitation at the venturi throat seem to be systematically destroyed through acoustic cavitation near the UNM. From the solution to the bubble dynamics equation, it has been shown that the potential energy of a bubble at its maximum radius due to an acoustic field is negligible compared to that for the hydrodynamic field. Hence, even though the control of hydrodynamic macro cavitation achieved in this way is at the expense of acoustic micro cavitation, it can still be considered to be a significant gain. These are some of the first results in this direction.

Numerical Investigation of Single Bubble Dynamics Passing a Mesh-Based Structure

2020 ◽  
Author(s):  
Fadi Alnaimat ◽  
Bobby Mathew ◽  
Omar Alhammadi
Keyword(s):  
Bubble Dynamics ◽  
Cfd Simulation ◽  
Single Bubble ◽  
Separation Mechanism ◽  
Mesh Structure ◽  
Flow Restriction ◽  
Complex Interactions ◽  
Vof Model ◽  
Single Bubble Dynamics ◽  
Physical Features

Abstract In this article, investigations of the dynamic behaviors of a single bubble flowing across a mesh-based structure domain was conducted using the volume of fluid (VOF) model. The study was investigated in various mesh structure sizes, including hole size and gap distance. The fundamental behavior of bubble deformation and the effects of gap sizes were analyzed. Subsequently, the predicted dynamics of the deforming bubble area and the effect of the surface tension were examined inside the mesh holes. The discharging bubbles from the mesh structure resulted in a slight difference in the physical features from the original bubble dynamics before entering the mesh (flow restriction). This drafted the bubbles in different trajectories and led to behave differently based on the mesh characteristics. The complex interactions and the subsequent deformations were observed between different mesh sizes. For the validation of the bubble dynamics, the results of computational fluid dynamics (CFD) simulation were tested under different mesh sizes detailing the velocity field, exiting trajectory, bubbles deformation, and residence time, which helps to reveal the affected parameters on the separation mechanism of the original bubble.

Experimental Study of Bubble Dynamics and Concentration Variation in the Presence of Boron in the Liquid

2002 ◽  
Author(s):  
W. Jia ◽  
V. K. Dhir
Keyword(s):  
Bubble Dynamics ◽  
Concentration Field ◽  
Nucleation Site ◽  
Single Bubble ◽  
Boron Compounds ◽  
Measured Concentration ◽  
Neutron Absorber ◽  
Concentration Variation ◽  
Water Reactors ◽  
Miniature Sensor

Accumulation of neutron absorber (boron or boron compounds) within the porous crud layer on the fuel rods in the cores of pressured water reactors (PWR) results in the so-called axial offset anomaly (AOA). There is practically little information on the gradients of neutron absorber concentration near a nucleation site on the cladding surface during the growth of a bubble. The objective of the present work is to study bubble dynamics and associated concentration field of aqueous boron. As a first step in solving the complete problem, dynamics of single bubble was studied under pool boiling conditions. Distilled water and an aqueous solution containing 3,000ppm by weight of boric acid were used as test liquids. Single bubble was generated at a micro-fabricated cavity on a polished silicon wafer. It was found that the growth and departure processes of single bubbles are similar for both the test liquids. A miniature sensor for measurement of concentration was developed and calibrated. Concentration variation near the liquid-vapor interface was detected successfully. The measured concentration variations at different radial locations from the center of cavity have the same trend as given by the numerical simulations but the magnitude is much smaller.

Experimental and Numerical Investigation of Damage on an Aluminum Surface by Single-Bubble Cavitation

2018 ◽  
Vol 7 (5) ◽  
pp. 20180038 ◽  
Author(s):  
Hemant J. Sagar ◽  
Stefanie Hanke ◽  
Martin Underberg ◽  
Chaojie Feng ◽  
Ould el Moctar ◽  
...  
Keyword(s):  
Numerical Investigation ◽  
Single Bubble ◽  
Aluminum Surface ◽  
Bubble Cavitation
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