کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
11015770 | 1781702 | 2018 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Void fraction measurement in cryogenic flows. Part II: Void fraction capacitive sensor performances in chilldown experiments
ترجمه فارسی عنوان
اندازه گیری کسری ضخیم در جریانهای فریزر. قسمت دوم: عملکرد سنسور خازنی کسر خالی در آزمایش های خنک کننده
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کلمات کلیدی
حسگر خازنی تجزیه و تحلیل میدان الکتریکی، کسری خالی، خرد کن، نیتروژن مایع، کانال خنک کننده فریزر
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
چکیده انگلیسی
This manuscript describes the work performed on void fraction measurements a cryogenic flow by means of a customized capacitive sensor. In a preceding activity, described in Part I, the instrument was developed and validated at room conditions. In the current study, the probe is exploited to detect the gaseous content during liquid nitrogen chilldown experiments. The sensor performances are evaluated both numerically and experimentally. The numerical simulations lead to the development of a new calibration formula improving the sensor measurement accuracy down to ±6.0%FS, within 99% confident interval. The experimental campaign mainly reveals a dependency of the sensor performance on the pressure and temperature variations during the cooldown of the test section. The so-called “thermal effect” therefore modeled and two compensation equations are derived. The void fraction results accordingly corrected, match the single-phase flows reference conditions within ±2% discrepancy. Background light visualizations are also performed allowing the optical verification of the flow regimes. For a specific flow condition, a correlation between the recorded light intensity and the capacitive measurements is obtained. By means of the high-speed movies, the capacitive sensor response time is also evaluated to be 100â¯Hz.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Cryogenics - Volume 96, December 2018, Pages 25-33
Journal: Cryogenics - Volume 96, December 2018, Pages 25-33
نویسندگان
Yuki Sakamoto, Laura Peveroni, Hiroaki Kobayashi, Tetsuya Sato, Johan Steelant, Jean-Marie Buchlin,