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Applying image processing methods to study hydrodynamic characteristics in a rectangular spouted bed
Chemical Engineering Science ( IF 4.7 ) Pub Date : 2018-10-01 , DOI: 10.1016/j.ces.2018.05.057
Jingsi Yang , Ronald W. Breault , Steven L. Rowan

Abstract This paper presents systematic image processing methods for investigating hydrodynamic characteristics in a rectangular spouted bed (30.2 mm × 101.6 mm). The objective is to provide a non-intrusive technique to determine the bed expansion ratio, the jet height and the fountain height due to their significant influence on the hydrodynamics of the entire bed. A high-speed video camera is used in the experiment with Geldart D particles as the bed material. After the image acquisition, image denoising, thresholding, logical and mask operations are applied correspondingly for the boundary discrimination, based on which an algorithm has been developed to determine the bed height successfully. With the discriminated boundary, morphological operations viz. erosion and dilation have been used to accurately determine the jet height and the fountain height. The feasibility of the technique is proven through profiles of bed expansion ratio, jet height and fountain height under three initial bed heights (0.0762 m, 0.102 m, and 0.127 m) for two different nozzle sizes (0.0096 m and 0.0127 m). Depending on the determination of the hydrodynamic characteristics, different flow regimes can be distinguished comprehensively through profiles of the bed expansion ratio and bed pressure drop in combination with the standard deviation of jet/fountain height. The proposed flow regime discrimination verifies the feasibility and effectiveness of the image processing methods in assessing the solids behavior in the spouted beds. Results about the variation of the jet height and the fountain height under current operating conditions as determined by the new technique are also discussed. This work has been selected by the Editors as a Featured Cover Article for this issue.

中文翻译:

应用图像处理方法研究矩形喷流床的水动力特性

摘要 本文提出了研究矩形喷流床(30.2 mm × 101.6 mm)流体动力学特性的系统图像处理方法。目标是提供一种非侵入式技术来确定床膨胀比、射流高度和喷泉高度,因为它们对整个床的流体动力学有显着影响。实验中使用高速摄像机,以 Geldart D 颗粒为床料。图像采集后,相应地应用图像去噪、阈值、逻辑和掩码操作进行边界判别,在此基础上开发了成功确定床高的算法。有了可区分的边界,形态学操作即。侵蚀和膨胀已被用于准确确定射流高度和喷泉高度。该技术的可行性通过两种不同喷嘴尺寸(0.0096 m 和 0.0127 m)在三个初始床高(0.0762 m、0.102 m 和 0.127 m)下的床膨胀比、射流高度和喷泉高度曲线得到证实。根据水动力特性的确定,可以通过床膨胀比和床压降曲线结合射流/喷泉高度的标准偏差来综合区分不同的流态。提出的流态鉴别验证了图像处理方法在评估喷射床中固体行为的可行性和有效性。还讨论了在当前操作条件下由新技术确定的射流高度和喷泉高度变化的结果。这项工作已被编辑选为本期的特色封面文章。
更新日期:2018-10-01
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