文化大學機構典藏 CCUR:Item 987654321/35963
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    jsp.display-item.identifier=請使用永久網址來引用或連結此文件: https://irlib.pccu.edu.tw/handle/987654321/35963


    题名: Measuring droplet fall speed with a high-speed camera: indoor accuracy and potential outdoor applications
    作者: Yu, CK (Yu, Cheng-Ku)
    Hsieh, PR (Hsieh, Pei-Rong)
    Yuter, SE (Yuter, Sandra E.)
    Cheng, LW (Cheng, Lin-Wen)
    Tsai, CL (Tsai, Chia-Lun)
    Lin, CY (Lin, Che-Yu)
    Chen, Y (Chen, Ying)
    贡献者: 大氣系
    关键词: VERTICAL WIND-TUNNEL
    WATER DROPS
    TERMINAL VELOCITY
    PRECIPITATION
    RAIN
    HYDROMETEORS
    DISDROMETER
    CLOUD
    SHAPE
    OSCILLATIONS
    日期: 2016
    上传时间: 2017-04-18 09:38:07 (UTC+8)
    摘要: Acquisition of accurate raindrop fall speed measurements outdoors in natural rain by means of moderatecost and easy-to-use devices represents a long-standing and challenging issue in the meteorological community. Feasibility experiments were conducted to evaluate the indoor accuracy of fall speed measurements made with a high-speed camera and to evaluate its capability for outdoor applications. An indoor experiment operating in calm conditions showed that the high-speed imaging technique can provide fall speed measurements with a mean error of 4.1-9.7% compared to Gunn and Kinzer's empirical fall-speed-size relationship for typical sizes of rain and drizzle drops. Results obtained using the same apparatus outside in summer afternoon showers indicated larger positive and negative velocity deviations compared to the indoor measurements. These observed deviations suggest that ambient flow and turbulence play a role in modifying drop fall speeds which can be quantified with future outdoor high-speed camera measurements. Because the fall speed measurements, as presented in this article, are analyzed on the basis of tracking individual, specific raindrops, sampling uncertainties commonly found in the widely adopted optical disdrometers can be significantly mitigated.
    關聯: ATMOSPHERIC MEASUREMENT TECHNIQUES 卷: 9 期: 4 頁碼: 1755-1766
    显示于类别:[大氣系所] 期刊論文

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