کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1784312 1524117 2015 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The use of infrared self-emission measurements to retrieve surface temperature of levitating water droplets
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک اتمی و مولکولی و اپتیک
پیش نمایش صفحه اول مقاله
The use of infrared self-emission measurements to retrieve surface temperature of levitating water droplets
چکیده انگلیسی


• Surface temperature of droplets levitating above a hot water layer is determined.
• The apparent temperature was measured in the infrared absorption band.
• Angular dependences of spectral emittance were used to retrieve the temperature.
• Spectral sensitivity of camera and optical filter are taken into account.

Levitating small water droplets formed from the upward flow of steam and entrained air above the heated water surface are studied. The case of relatively large droplets in the middle of a droplet cluster which is practically immobile at a small distance from the water surface is considered. The close-up infrared measurements in the spectral absorption band of water are used to identify temperature of the upper surface of the droplet. Both the directional spectral emittance of water surface and the spectral sensitivity of the device are taken into account to formulate an inverse problem for the integral equation. The numerical solution of this problem showed that temperature is minimal at the top of droplet and increases sharply towards the droplet equator. This temperature difference increases almost linearly with the droplet size. The results obtained are expected to be useful for more detailed physical analysis and possible modeling of complex behavior of the levitating droplet clusters.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Infrared Physics & Technology - Volume 69, March 2015, Pages 238–243
نویسندگان
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