scholarly journals Preliminary design of high temperature ultrasonic transducers for liquid sodium environments

2018 ◽  
Author(s):  
M. S. Prowant ◽  
G. Dib ◽  
H. Qiao ◽  
M. S. Good ◽  
M. R. Larche ◽  
...  
Keyword(s):  
High Temperature ◽  
Ultrasonic Transducers ◽  
Liquid Sodium ◽  
Preliminary Design

High Temperature Durability Improvement of PbTiO3/ Pb(Zr,Ti)O3 Ultrasonic Transducers

2021 ◽  
Author(s):  
Kohei Hirakawa ◽  
Makie Hidaka ◽  
Naoki Kambayashi ◽  
Makiko Kobayashi
Keyword(s):  
High Temperature ◽  
Ultrasonic Transducers

scholarly journals Development of Low Frequency High Temperature Ultrasonic Transducers for In-service Monitoring of Pipework in Power Plants

2016 ◽  
Vol 168 ◽  
pp. 983-986 ◽  
Author(s):  
A. Dhutti ◽  
S.A. Tumin ◽  
A. Mohimi ◽  
M. Kostan ◽  
T.H. Gan ◽  
...  
Keyword(s):  
High Temperature ◽  
Power Plants ◽  
Low Frequency ◽  
Ultrasonic Transducers ◽  
Service Monitoring

scholarly journals Brazing Strategies for High Temperature Ultrasonic Transducers Based on LiNbO3 Piezoelectric Elements

Instruments ◽  
2018 ◽  
Vol 3 (1) ◽  
pp. 2 ◽  
Author(s):  
Christopher Bosyj ◽  
Neelesh Bhadwal ◽  
Thomas Coyle ◽  
Anthony Sinclair
Keyword(s):  
High Temperature ◽  
Lithium Niobate ◽  
Elevated Temperatures ◽  
Piezoelectric Element ◽  
Low Noise ◽  
Ultrasonic Transducers ◽  
Acoustic Coupling ◽  
Industrial Operations ◽  
Critical Components

Long-term installation of ultrasonic transducers in high temperature environments allows for continuous monitoring of critical components and processes without the need to halt industrial operations. Transducer designs based on the high-Curie-point piezoelectric material lithium niobate have been shown to both be effective and stable at extreme temperatures for long-term installation. In this study, several brazing techniques are evaluated, all of which aim to provide both mechanical bonding and acoustic coupling directly to a bare lithium niobate piezoelectric element. Two brazing materials—a novel silver-copper braze applied in a reactive air environment and an aluminum-based braze applied in a vacuum environment—are found to be suitable for ultrasound transmission at elevated temperatures. Reliable wide-bandwidth and low-noise ultrasound transmission is achieved between room temperature and 800 °C.

scholarly journals Problems of sodium using in pulsating heat pipe made from fused silica

2018 ◽  
Vol 207 ◽  
pp. 04004
Author(s):  
Radovan Nosek ◽  
Tatiana Liptáková ◽  
Libor Trško ◽  
Zuzana Kolková ◽  
Milan Malcho ◽  
...  
Keyword(s):  
High Temperature ◽  
Heat Pipe ◽  
Alkali Metals ◽  
High Efficiency ◽  
Fused Silica ◽  
Operating Conditions ◽  
Liquid Sodium ◽  
Working Fluid ◽  
Pulsating Heat Pipe ◽  
High Temperature Reaction

You Heat pipe is a high efficiency heat transfer element, depends on the evaporation, condensation and circulation of inside working fluid. The working fluid of a high temperature pulsating heat pipe is generally alkali metals, and sodium heat pipe can operate in range of 500-1100°C. In order to investigate terminal velocity of working fluid, the glass pulsating heat pipe was produced for experimental purposes. The experiment was carried out, in order to simulate real operating conditions in range of 500-1100°C. Sudden boiling of liquid sodium (b.p. = 883°C at 1 atm) inside the all quartz-made heat pipe results in high-temperature reaction of sodium vapour with the inner wall surface. The reaction became more aggressive with increasing vapour temperature and resulted in heat pipe explosion. The evaluation of damage character is analysed in this paper.

Design and development of high-temperature tribometer for material testing in liquid sodium environment

2016 ◽  
Vol 10 (3) ◽  
pp. 276
Author(s):  
Hemant Kumar ◽  
S. Vijayaraghavan ◽  
Shaju K. Albert ◽  
A.K. Bhaduri ◽  
K.K. Ray
Keyword(s):  
High Temperature ◽  
Material Testing ◽  
Liquid Sodium ◽  
Design And Development

Experimental Study on Sodium Column Fire of Sodium-Cooled Fast Reactor

2013 ◽  
Author(s):  
Kang-wei Peng ◽  
Zhi-gang Zhang ◽  
Ming Guo ◽  
Chao Wang ◽  
Shu-bin Sun
Keyword(s):  
High Temperature ◽  
Fast Reactor ◽  
Difficult Problem ◽  
Temperature Fields ◽  
Practical Significance ◽  
Liquid Sodium ◽  
Insulation Material ◽  
Reactor Accident ◽  
Temperature Liquid ◽  
Operation Pressure

In the operation of sodium-cooled fast reactor, accident caused by the leakage and combustion of liquid sodium is common, and it is a pivotal and difficult problem in research, construction and operation of sodium-cooled fast reactor internationally. In actual operation of sodium-cooled fast reactor, liquid sodium in sodium fire accident is difficult to form fog but mainly in columnar flow form due to low operation pressure and thermal insulation material wrapping the pipe, so experimental research about columnar fire is of much more practical significance. This paper focuses on combustion property on sodium column fire in the sodium-cooled fast reactor. Liquid sodium with high temperature will be poured into the combustion room via pouring high pressure nitrogen into sodium storage tank when solid sodium has been heated to enactment temperature; liquid sodium with high temperature will burn at combustion room with air forming sodium column fire. Initial temperature of sodium jet is about 200°C in experiment and spurt pressure is 0.2MPa, spurt flow is about 0.4–0.6m3 each hour. Temperature fields in combustion tank space and the catch plate in the bottom are measured through dozens of thermocouple distributed in combustion tank. No atomization phenomenon would exist in the pure sodium columnar fire in the space, the atomized fire triggered by splashed sodium from sodium stream striking the admittance plat and generate more than the high temperature of 900°C.

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