Experimental Investigation and Calculation of Drag Coefficient of Secondary Bag Breakup Regime

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Moeini, Iman | 2015

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 47608 (08)
University: Sharif University of Technology
Department: Mechanical Engineering
Advisor(s): Firoozabadi, Bahar; Afshin, Hossein
Abstract:
In the present study, we are to investigate and calculate the drag coefficient in the secondary bag breakup regime in droplet experiment in which the liquid droplet falls into continuous air jet flow. A high speed camera is hired to record the pictures of this process. With the help of image processing techniques, parameters such as dimensionless diameter, growth of droplet, drag coefficient and etc. in secondary bag breakup regime are investigated. The liquid used in this experiments are water, gasoline and diesel fuel. Dimensionless number influencing the result of the experiment are weber and Ohnesorge numbers, with weber number ranging from 6.86 to 20.31 and Ohnesorge number ranging from 0.001203 to 0.007253. The result of image processing indicates that with an increase of weber number, dimensionless diameter initially decreases and then increases. Also an increase of dimensionless time results in an increase in growth of droplet. Finally, an equation to calculate the drag coefficient is obtained. The drag coefficient calculated from that equation based on the image processing data ranges from 0.42 to 2.074 which is in accordance with reality
Keywords:
Drag Coefficient ; Image Processing ; Weber Number ; Ohnesorge Number ; Secondary Breakup

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