First Annual Report on Development of Microwave Resonant Cavity Transducer for Fluid Flow Sensing - Development of Sensor Performance Model of Microwave Cavity Flow Meter for Advanced Reactor High Temperature Fluids

Steam pressure and resonant frequency of microwave cavity are important measure parameters of microwave wetness measurement system. The measuring precision of pressure and frequency directly affect the accuracy of wetness measurement. This paper takes different pressure and wetness of steam as example to analyze the parameter uncertainty of measurement relationship and deduces standard uncertainty of wetness measurement. The system comprehensive uncertainty is identified, when the parameters measurement, cavity heat expansion, sampling error, sedimentary water film and so on are considered. The result shows that the system uncertainty is less than 0.004%. The system uncertainty introduced by pressure measurement is small and can be neglected, but the system uncertainty from frequency measurement has a great effect. The precisely measurement of resonance frequency is key to ensure the accuracy of the system.

Download Full-text

THE EFFECTS OF INLET AIR QUANTITY AND INLET OXYGEN MOLE FRACTION ON THE COMBUSTION AND FLUID FLOW IN A SULFUR RECOVERY UNIT THERMAL REACTOR

Transactions of the Canadian Society for Mechanical Engineering ◽

10.1139/tcsme-2017-1020 ◽

2017 ◽

Vol 41 (2) ◽

pp. 293-300 ◽

Cited By ~ 3

Author(s):

Chun-Lang Yeh

Keyword(s):

Fluid Flow ◽

High Temperature ◽

Mole Fraction ◽

Thermal Reactor ◽

Sulfur Recovery ◽

Economical Method ◽

Sulfur Recovery Unit ◽

Recovery Unit ◽

Field Temperature ◽

High Temperature Operation

Owing to the high temperature inside a sulfur recovery unit (SRU) thermal reactor, detailed experimental measurements are difficult. In the author’s previous studies, several methods have been assessed to resolve the abnormality of the SRU thermal reactor under high temperature operation. This paper presents a new easier and more economical method. The effects of inlet air quantity and inlet O2 mole fraction on the combustion and fluid flow in a SRU thermal reactor are investigated numerically. The flow field temperature, S2 recovery, H2S mole fraction, and SO2 emissions are analyzed. This paper provides a guideline for adjusting the inlet air quantity and the inlet O2 mole fraction to reduce the high temperature inside a thermal reactor and to ensure an acceptable sulfur recovery.

Download Full-text

HIGH-TEMPERATURE MATERIALS AND REACTOR COMPONENT DEVELOPMENT PROGRAMS. VOLUME I. MATERIALS. Third Annual Report

10.2172/4069550 ◽

1964 ◽

Author(s):

Keyword(s):

High Temperature ◽

Annual Report ◽

Development Programs ◽

High Temperature Materials ◽

Component Development

Download Full-text

Resonant flow in small cavities submerged in a boundary layer

Proceedings of the Royal Society of London Series A - Mathematical and Physical Sciences ◽

10.1098/rspa.1988.0125 ◽

1988 ◽

Vol 420 (1859) ◽

pp. 219-245 ◽

Cited By ~ 9

Keyword(s):

Boundary Layer ◽

Turbulent Boundary Layer ◽

Large Scale ◽

Resonant Cavity ◽

Cavity Flow ◽

Flow Speed ◽

Small Scale ◽

S Waves ◽

Grooved Surface ◽

Tollmien Schlichting

The viscosity-dominated unsteady flow in a row of small transverse square cavities lying submerged in a turbulent boundary layer is first considered. Experiments performed primarily with one size of cavities show that the cavity flow can be excited by freestream disturbances in a narrow frequency band that is independent of the flow speed. The turbulent boundary layer in which the cavities are submerged remains transparent to the disturbances. The cavity flow resonates when the depths of the cavity and the Stokes layer are nearly the same, that is when 2π fk 2 / v = 1, where f is the frequency of the resonant cavity flow, k is the cavity height and v is the kinematic viscosity of the fluid. An associated laminar boundary-layer excitation experiment shows that the instability process over the grooved surface also involves the amplification of Tollmien–Schlichting (T–S) waves in much the same manner as in a smooth-wall Blasius profile but the grooves enhance receptivity. A theory is given proposing that the resonant groove flow in the low Reynolds number turbulent boundary layer is driven by highly amplified matched T–S waves. The possible relevance of the observed coupling between the large-scale freestream disturbances and the small-scale cavity flows to the turbulence production mechanism in a smooth flat-plate turbulent boundary layer is also discussed.

Download Full-text