Gravity affected break-up of laminar threads at low gas-relative-velocities

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• 作者：Axel Mescher ; ^{axel.mescher@bci.tu-dortmund.de} ; Arne Mö ; ller ^{arne.moeller@tu-dortmund.de} ; Martin Dirks ^{martin.dirks@bci.tu-dortmund.de} ; Peter Walzel ^{peter.walzel@bci.tu-dortmund.de}
• 关键词：Laminar thread break-up ; Gas cross-flow ; Drop ; Multiphase flow ; Fluid mechanics ; Parameter identification
• 刊名：Chemical Engineering Science
• 出版年：2012
• 出版时间：13 February 2012
• 年：2012
• 卷：69
• 期：1
• 页码：181-192
• 全文大小：1184 K

文摘

Due to gravity, initially slow threads are significantly attenuated until break-up occurs. In our experiments these threads are further subject to a gas cross-flow, covering the range of low gas-relative-velocities (<10 m/s). Thread contour data as well as information on the droplet size distribution (DSD), formed under these conditions, are obtained by a shadow-graphic method. The experimental results on the break-up length of the threads confirm the results of former investigations. In contrast, for the mean drop size an unexpected dependency on the gas-relative-velocity is observed, as larger droplets were found for intensified cross-flows. The width of the DSD was found to be also sensitive on the gas-relative-velocity. Even slightly intensified gas cross-flows distinctly increase the poly-dispersity of the DSD.