An Experimental Investigation Of Acoustic Cavitation In Gaseous Liquids
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An Experimental Investigation Of Acoustic Cavitation In Gaseous Liquids
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Author : Dario Felipe Gaitan
language : en
Publisher:
Release Date : 1990
An Experimental Investigation Of Acoustic Cavitation In Gaseous Liquids written by Dario Felipe Gaitan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Gases categories.
An Experimental Investigation Into The Correlation Between Acoustic Emission Ae And Bubble Dynamics
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Author : Shuib Husin
language : en
Publisher:
Release Date : 2011
An Experimental Investigation Into The Correlation Between Acoustic Emission Ae And Bubble Dynamics written by Shuib Husin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
Bubble and cavitation effects phenomena can be encountered in two-phase gas-liquid systems in industry. In certain industries, particularly high-risk systems such as a nuclear reactor/plant, the detection of bubble dynamics, and the monitoring and measurement of their characteristics are necessary in controlling temperature. While in the petro-chemical engineering industry, such as oil transportation pipelines, the detection and monitoring of bubbles/cavitation phenomena are necessary to minimise surface erosion in fluid carrying components or downstream facilities. The high sensitivity of Acoustic Emission (AE) technology is feasible for the detection and monitoring of bubble phenomena in a two phase gas-liquid system and is practical for application within the industry. Underwater measurement of bubble oscillations has been widely studied using hydrophones and employing acoustic techniques in the audible range. However, the application of Acoustic Emission (AE) technology to monitor bubble size has hitherto not been attempted. This thesis presents an experimental investigation aimed at exploring AEs from gas bubble formation, motion and destruction. AE in this particular investigation covers the frequency range of between 100 kHz to 1000 kHz. The AE waveform analysis showed that the AE parameter from single bubble inception and burst events, i.e. AE amplitude, AE duration and AE energy, increased with the increase of bubble size and liquid viscosity. This finding significantly extends the potential use of AE technology for detecting the presence of bubbles in two-phase flow. It is concluded that bubble activity can be detected and monitored by AE technology both intrusively and non-intrusively. Furthermore, the bubble size can be determined by measurement of the AE and this forms the significant contribution of this thesis.
Liquids Under Negative Pressure
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Author : A.R. Imre
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Liquids Under Negative Pressure written by A.R. Imre and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.
It is possible to "stretch" a liquid and, when suitably prepared, liquids are capable of sustaining substantial levels of tension, often for significant periods of time. These negative pressure states are metastable but can last for days - long enough for substantial experimental investigation. This volume is a review of recent and current research into the behaviour of liquids under negative pressure. Part I deals with the thermodynamics of stretched liquids. Part II discusses the physical and chemical behaviour of liquids under negative pressure. Part III contains papers on the effect of negative pressure on the solidification of a liquid. Part IV is devoted to stretched helium and Part V discusses cavitation in various stretched liquids. Part VI deals with the effect of foreign substances on cavitation.
The Ignition Of Liquid Monopropellants By Acoustic Cavitation
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Author : Mark Santo Compagna
language : en
Publisher:
Release Date : 1975
The Ignition Of Liquid Monopropellants By Acoustic Cavitation written by Mark Santo Compagna and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1975 with Cavitation noise categories.
This report concerns an investigation into the possibility of implementing an ignition scheme, which utilizes acoustic cavitation, into the technology of liquid propellant gun systems. The feasibility of such an ignition technique, demonstrated by this research, has laid the foundation for further development and future implementation of this type of ultrasonic, low- energy, highly efficient method. Due to the fundamental nature of this research (this was the first attempt to utilize ultrasonics as an ignition scheme) , there was a general lack of ballistic and acoustic hardware necessary for an extensive experimental study. Accordingly, this research has intended merely to demonstrate that ultrasonic ignition can occur, specify the thresholds for its occurrance , and to develop theoretical projections for its implementation.This investigation resulted in an experimental determination of the minimum value of the energy density necessary to initiate a chemical reaction which would cause ignition under proper conditions. The value of the threshold energy density obtained was 2.5 joules/cm3/sec. Finally, a suggested means of implementation of an acoustic cavitation ignition scheme is given whereby cavitation is developed in a precombustion chamber by an acoustic transducer exterior to the chamber.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1991
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Aeronautics categories.
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Phosphors
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Author : Sanjay J. Dhoble
language : en
Publisher: CRC Press
Release Date : 2018-05-11
Phosphors written by Sanjay J. Dhoble and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-05-11 with Science categories.
Rare earth–doped luminescent materials play an integral role in modern life because of their tremendous applications ranging from scintillators, color displays, fluorescent lamps, and intensifying screens to dosimetry of ionizing radiations. Written and edited by prominent luminescence researchers, this book details cutting-edge research on luminescence materials and is illustrated throughout with excellent figures and references. It will appeal to anyone involved in luminescence research and its applications, especially advanced undergraduate-, graduate-, and postgraduate-level students of spectroscopy, solid state physics, luminescence, material synthesis, and optical properties and researchers working on the synthesis of optical materials, the characterization of luminescence materials, solid state lighting, radiation dosimetry luminescence, and phosphor applications.
Cavitation And Inhomogeneities In Underwater Acoustics
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Author : W. Lauterborn
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Cavitation And Inhomogeneities In Underwater Acoustics written by W. Lauterborn and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.
Physical Principles Of Ultrasonic Technology
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Author : L. Rozenberg
language : en
Publisher: Springer
Release Date : 1973-09
Physical Principles Of Ultrasonic Technology written by L. Rozenberg and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 1973-09 with Technology & Engineering categories.
Under the action of acoustic vibrations a liquid is converted into the aerosol state at the interface between a gaseous and a liq uid medium. Acoustic energy can be delivered to the atomization zone either on the liquid side or on the gas side. Ordinarily, when acoustic energy is delivered through the gas, the atomization of the liquid is realized by sonic and low-frequency ultrasonic vibra tions because high-frequency ultrasound is rapidly damped in prop agation through gases. But if the acoustic energy is delivered through the liquid, whose damping factor is orders of magnitude smaller than in gases, atomization can be realized by sonic, low frequency ultrasonic, or high-frequency ultrasonic vibrations. The following is a convenient classification of methods for the ultra sonic atomization of a liquid: 1. atomization of the liquid with the transmission of acoustic energy to the working zone through the liquid: a. atomization in a layer; b. atomization in a fountain; 2. atomization of the liquid with the transmission of acoustic energy to the working zone through the gas. 3 Chapter 1 Acoustic Atomization of Liquids The atomization of liquids by ultrasound (at a frequency of 300 kHz) was discovered in the classical studies of Wood and Loomis [1]. The first experimental investigation of the physical nature of the 8tomization of a liquid by ultrasound was conducted by Sollner [2].
Sonoluminescence
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Author : F. Ronald Young
language : en
Publisher: CRC Press
Release Date : 2004-08-30
Sonoluminescence written by F. Ronald Young and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004-08-30 with Science categories.
While it is still a mystery of how a low-energy-density sound wave can concentrate enough energy in a small enough volume to cause the emission of light, research in acoustic cavitation and sonoluminescence has lead to plausible theories in which the source of light can be experimentally sustained. It has also lead to promising applications, such a
Experimental Investigation Of The Influence Of Thermodynamic Properties Of Liquid On Cavitation Phenomena
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Author : N. S. Ershov
language : en
Publisher:
Release Date : 1967
Experimental Investigation Of The Influence Of Thermodynamic Properties Of Liquid On Cavitation Phenomena written by N. S. Ershov and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1967 with categories.
It was proposed in previously published work that the effect of the properties of a liquid on cavitation phenomena can be evaluated in terms of the number 'B', which is the ratio of the volume of vapor formed during cavitation to the volume of the liquid flow. The experiments described in the article were carried out in a Venturi cavitation tube. The temperature of the water was varied from 290 to 359K, and the temperature of the alcohol from 293 to 332K. The calculations show that, with these changes in temperature, the B number changes 30 times for water and approximately 4 times for alcohol. The article includes a sketch of the cavitation tube.