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2012 | Buch

Ultrasonic Doppler Velocity Profiler for Fluid Flow

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Über dieses Buch

The ultrasonic velocity profile (UVP) method, first developed in medical engineering, is now widely used in clinical settings. The fluid mechanical basis of UVP was established in investigations by the author and his colleagues with work demonstrating that UVP is a powerful new tool in experimental fluid mechanics. There are diverse examples, ranging from problems in fundamental fluid dynamics to applied problems in mechanical, chemical, nuclear, and environmental engineering. In all these problems, the methodological principle in fluid mechanics was converted from point measurements to spatio-temporal measurements along a line. This book is the first monograph on UVP that offers comprehensive information about the method, its principles, its practice, and applied examples, and which serves both current and new users. Current users can confirm that their application configurations are correct, which will help them to improve the configurations so as to make them more efficient and effective. New users will become familiar with the method, to design applications on a physically correct basis for performing measurements accurately. Additionally, the appendix provides necessary practical information, such as acoustic properties.

Inhaltsverzeichnis

Frontmatter
Chapter 1. Introduction
Abstract
The ultrasonic Doppler velocity profiler (UVP) method is now an accepted and established tool in modern experimental fluid mechanics and fluid engineering. I presented my first set of results illustrating the versatility and power of UVP at the conference in 1985 [Takeda, Velocity profile measurement by ultrasound Doppler shift method. In: Harada M, Pergamon (eds) Fluid control and measurement, FLUCOME TOKYO ’85, Tokyo, 1985, p 851]. The span of almost two decades from introduction to acceptance is remarkably in accord with the remarks made by Leibovich (Annu Rev Fluid Mech 35, 2003) on the time it takes for novel theoretical ideas to gain acceptance in fluid mechanics. In the 1985 conference I presented the results of UVP measurement in several flow configurations and emphasized the importance of this development because it is a line measurement and different from point measurement. In the meeting I recall discussing the future of flow measurement with R.J. Adrian, who admitted that line or areal measurement of flow field is important. [Adrian extended the laser speckle method to a development of PTV/PIV, which is also a key technology of current flow measurements (Exp Fluids 39:159–169, 2005).]
In this review I give a brief history of the development of the ultrasonic Doppler velocity profiler (UVP) and describe several examples of its diversity and use in fluid mechanics and engineering.
Yasushi Takeda

Fundamentals

Frontmatter
Chapter 2. Ultrasonic Wave for Fluid Flow
Abstract
Ultrasonic velocity profilers (UVP) utilize a pulsed ultrasonic beam and the scattering of ultrasonic waves on tracer particles to obtain instantaneous velocity profiles. This chapter summarizes (1) basic characteristics of ultrasonic waves, their propagation, diffraction, inflection, reflection, transmission, interference, and scattering (Sect. 2.3); (2) the formation of pulsed ultrasonic beams (Sects. 2.4 and 2.5); (3) mode transformations between longitudinal and transversal (shear) waves used in flow measurements in pipes with thicker walls (Sect. 2.6); and (4) basics of ultrasonic transducers that generate ultrasonic beams are also explained (Sect. 2.7). All the explanations about ultrasonic waves given here help to understand the principles and configurations of UVP measurements and to distinguish the content that is ­further highlighted in comparison with other textbooks of ultrasonic physics or ultrasonic techniques.
Yasushi Takeda, Yuji Tasaka
Chapter 3. Ultrasonic Doppler Method
Abstract
The ultrasonic velocity profiler (UVP) mainly employs the ultrasonic Doppler method to obtain a one-dimensional velocity profile. The measurement position is a function of time-of-flight of the ultrasonic pulses, and the velocity is obtained from the Doppler shift frequency. The principle and the method to detect the Doppler shift frequency are described in Sect. 3.1. When we use UVP for measuring velocity profiles in real situation, selections of the ultrasonic basic frequency, transducer setting, and ultrasonic reflectors are important, as shown in Sect. 3.2. Attention to be paid for measuring velocity is described in Sect. 3.3. Velocity aliasing appears if the velocity is over the maximum velocity defined by the Nyquist sampling theorem. We have to set a transducer carefully to avoid multiple reflections from surroundings. Temperature directly affects the measurement accuracy because measurement positions and velocities are functions of sound speed, and we also have to pay attention to the effects of solid boundary and measurement volume.
Hideki Murakawa, Michitsugu Mori, Yasushi Takeda
Chapter 4. Measurement of Fluid Flow
Abstract
On the basic of the ultrasonic principle made clear in Chaps. 1– flow velocity profiling can be realized if the Doppler method is applicable to the flow system. There are standard velocity fields, which are the most appropriate systems for examining the performance of ultrasonic velocity profiling (UVP) and training users in making UVP measurements. The standard velocity fields have a one-dimensional one-component velocity distribution, irrespective of whether they are steady or unsteady, such as in the case of flow in a rotating circular cylinder and laminar flow in a pipe. Measuring flow in such systems helps clarify the functions of UVP subject to diverse practical problems. Once velocity information is acquired, it is suitably adjusted in post-processing. Post-processing has two purposes: one is to improve the data quality in response to the inclusion of noise in velocity data, and the other is to derive statistical and other quantities.
Yuichi Murai, Noriyuki Furuichi, Yasushi Takeda, Yuji Tasaka

Applications

Frontmatter
Chapter 5. Practical Applications
Abstract
Because of the advantages of the ultrasonic velocity Doppler profiler (UVP), namely in spatiotemporal velocity field measurements and in its applicability for opaque liquids, UVP has a wide field of application in science and industry. The following chapter introduces carefully selected examples of applications covering relatively basic areas of application. The focus of the contents in this chapter is categorized into (1) studies of flow instability and transition (Sect. 5.1), (2) measurements and investigations of liquid metal flows (Sect. 5.2), (3) developments of new rheometry (Sect. 5.3), (4) determinations of rheological properties (Sect. 5.4), (5) studies of magnetic fluids (Sect. 5.5) and (6) gas–liquid two-phase flow (Sect. 5.6), (7) measurements of flowrate in turbidity flows (Sect. 5.7), and (8) ­determinations of flows in a deforming tube for biomedical applications (Sect. 5.8). The measurement and post-processing techniques used in this chapter are described in detail in Chaps.​ 4 and 7, and detailed explanations of these aspects are omitted in this chapter.
Yuji Tasaka, Beat Birkhofer, Noriyuki Furuichi, Hiroshige Kikura, Hisato Minagawa, Yuichi Murai, Hideki Murakawa, Masaaki Motozawa, Samsun Nahar, Hironari Obayashi, Tatsuo Sawada, A. K. Jeelani Shaik, Yasushi Takeda, Kenichi Tezuka, Yoshiyuki Tsuji, Takatoshi Yanagisawa, Sanehiro Wada, Johan Wiklund, Erich J. Windhab
Chapter 6. Industrial Applications
Abstract
Because of many advantages of ultrasonic velocity profile (UVP) ­measurement, the range of industrial applications is very wide. In this chapter, flowrate measurement, food and suspension flow, and measurement around a ship are introduced as examples of applications for UVP measurement in the industrial field. In the fields of flowrate measurement, studies concerning with the accuracy of this flowrate measurement method and calibration results of an actual flow are described, including application examples such as open channel and multi-line measurement. In the field of food and suspension flow, taking advantage of its applicability to opaque fluid, a velocity measurement is performed for fluid such as tomato soup and chocolate. Using the in-line UVP + PD method, measurements of transient flow such as thermal processing and liquid displacement, which are very important in the food industry, are performed. Measurement around a ship is an application example taking advantage of the compact installation possible for an ultrasonic sensor. Ultrasonic transducers are installed on the bottom of the actual ship, and measurement examples of velocity profile and Reynolds stress are introduced.
Noriyuki Furuichi, Beat Birkhofer, Yuichi Murai, A. K. Jeelani Shaik, Johan Wiklund, Erich J. Windhab
Chapter 7. Extended Techniques
Abstract
We have many demands to understand flow phenomena in many industrial applications. Detecting the gas–liquid interface is important when measuring velocities in two-phase flow or in an open channel. We want to obtain velocity distributions two dimensionally, also. To extend the applicability, many techniques utilizing the ultrasonic Doppler velocity profiler (UVP) have been recently developed. This chapter shows these extended techniques. Liquid and gas velocity distributions are obtained simultaneously using a multi-wave transducer are described in Sect. 7.1. Techniques detecting a gas–liquid interface depending on fluid interface relative to the ultrasonic wavelength are presented in Sect. 7.2. The UVP is utilized for measuring void fraction distributions in Sect. 7.3. Section 7.4 shows a technique measuring two-dimensional velocity components. A new approach for improving temporal resolution using the ultrasonic correlation method is presented in Sect. 7.5.
Hideki Murakawa, Tatsuya Kawaguchi, Hironari Obayashi, Yuichi Murai, Yuji Tasaka
Backmatter
Metadaten
Titel
Ultrasonic Doppler Velocity Profiler for Fluid Flow
herausgegeben von
Yasushi Takeda
Copyright-Jahr
2012
Verlag
Springer Japan
Electronic ISBN
978-4-431-54026-7
Print ISBN
978-4-431-54025-0
DOI
https://doi.org/10.1007/978-4-431-54026-7

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