Icone19-44019 Liquid Film Thickness Measurement in Small Square Pipe Using Ultrasonic Pulse-Echo Method

Aoyama, Goro; Watahiki, Naohisa; Nagayoshi, Takuji; Baba, Atsushi; Ohtsuka, Masaya

doi:10.1299/jsmeicone.2011.19._icone1944_11

Cited by 3 publications

(6 citation statements)

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“…The liquid film thickness of the vertical upward flow was measured with the ultrasonic transducer and a liquid film sensor based on the electrical conductance method at room temperature. The most frequently observed thickness range measured by the two methods was almost the same [4].…”

Section: Waveformsmentioning

confidence: 76%

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Application results of a prototype ultrasonic liquid film sensor to a 7 MPa steam–water two-phase flow experiment

Aoyama

Fujimoto

Katono

et al. 2015

Journal of Nuclear Science and Technology

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A prototype ultrasonic liquid film sensor was applied to a high-temperature steam-water two-phase flow experiment. The liquid film sensor was vertically installed in a loop which was connected to HUSTLE, a multi-purpose steam source test facility. The hydraulic diameter of the measurement section was 9.4 mm. The output waveforms of the sensor were acquired with a digital oscilloscope. The fluid temperature and system pressure were kept at 288 • C and 7.2 MPa, respectively, during the experiment. The pulse-echo method was used to calculate the liquid film thickness. The cross-correlation calculation was utilized to determine the time difference between the pulse reflected at the sensor surface and the pulse reflected at the liquid film surface. The time-averaged liquid film thicknesses were less than 0.055 mm in the annular flow condition. The increase of the time-averaged thickness was small with the change of the gas momentum flux. The film thicknesses measured with the sensor were compared with the past experimental results; the former were smaller than one-fourth of the thickness estimated as the mean film thickness. The comparison results suggested that the continuous liquid sublayer thickness was measured with the liquid film sensor.

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Section: Waveformsmentioning

confidence: 76%

“…One of them was utilized in a fuel assembly type test section and a steam−water experiment was carried out at the 1 MPa condition [3]. In an atmospheric pressure condition, the liquid film thickness in the upward flow was measured by the authors with an ultrasonic transducer and a liquid film sensor based on the conductance method [4].…”

Section: Introductionmentioning

confidence: 99%

Application results of a prototype ultrasonic liquid film sensor to a 7 MPa steam–water two-phase flow experiment

Aoyama

Fujimoto

Katono

et al. 2015

Journal of Nuclear Science and Technology

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“…The minimum liquid film thickness measured with a needle contact probe at 7 MPa was 0.026 mm [1]. Previously, it was confirmed that the liquid film thickness of 0.03 mm could be measured by the ultrasonic measurement technique at room temperature [7]. Furthermore, the speed of sound in water at 286…”

Section: Results Of Thickness Measurementsmentioning

confidence: 99%

“…The time difference t was searched in the range of 1 μs which was equal to the half width of a waveform. In a previous study made by the authors [7], the stable liquid film thickness measured with an ultrasonic transducer was compared with the result of a laser displacement sensor to confirm the suitability of using the difference waveform d(t). The results showed good agreement within the range from 0.06 to 0.22 mm.…”

Section: Results Of Thickness Measurementsmentioning

confidence: 99%

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Preliminary test of an ultrasonic liquid film sensor for high-temperature steam–water two-phase flow experiments

Aoyama

Nagayoshi

Baba

2014

Journal of Nuclear Science and Technology

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A prototype liquid film sensor for high-temperature steam-water experiments has been developed. The sensor shape simulates a boiling water reactor (BWR) fuel rod. The pulse-echo method can be utilized to measure the thickness of the liquid film covering the sensor surface. A piezoelectric element is soldered onto the inside of the sensor casing which consists of two curved casing pieces. After the piezoelectric element is attached, the two casing pieces are laser welded together. It is confirmed that the temperature rise at the time of the laser welding does not influence soldering of the piezoelectric element. The pressure proof test shows that the sensor can be used at a high-pressure condition of 7 MPa. Simple air-water experiments are done at atmospheric pressure to confirm the liquid film thickness can be measured with the sensor. The fluctuation of the liquid film thickness is satisfactorily captured with the sensor. The minimum and maximum thicknesses are 0.084 and 0.180 mm, respectively. The amplitude of the waveform at 286• C is predicted by the calculation based on the acoustic impedance. It is expected that the sensor is able to measure the liquid film thickness even at BWR operating conditions.

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Two-phase Flow Characteristics in BWRs

Katono¹,

Aoyama²,

Nagayoshi³

et al. 2014

JAPANESE JOURNAL OF MULTIPHASE FLOW

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Reliable prediction of two-phase flow characteristics is important for safety and economy improvements of BWR plants. We have been developing two-phase flow measurement tools and techniques for BWR thermal hydraulic conditions, such as a 3D time-averaged X-ray CT system, an ultrasonic liquid film sensor and a wire-mesh sensor. We applied the developed items in experiments using the multi-purpose steam-water test facility known as HUSTLE, which can simulate two-phase thermal-hydraulic conditions in a BWR reactor pressure vessel, and we constructed a detailed instrumentation database. We validated a 3D two-phase flow simulator using the database and developed the reactor internal two-phase flow analysis system.

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Icone19-44019 Liquid Film Thickness Measurement in Small Square Pipe Using Ultrasonic Pulse-Echo Method

Cited by 3 publications

References 0 publications

Application results of a prototype ultrasonic liquid film sensor to a 7 MPa steam–water two-phase flow experiment

Application results of a prototype ultrasonic liquid film sensor to a 7 MPa steam–water two-phase flow experiment

Preliminary test of an ultrasonic liquid film sensor for high-temperature steam–water two-phase flow experiments

Two-phase Flow Characteristics in BWRs

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