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Turbulent mixing of oil droplets in a round water jet

Turbulent mixing of oil droplets in a round water jet

Chapter 4ResultsThis

Chapter 4ResultsThis chapter gives an overview of the results of the experimental work that is performed. Insection 4.1, attention is given to the relevant jet and droplet properties, the coflow and the singlephaseexperiments. Sections 4.2 and 4.3, address respectively the velocity and concentrationmeasurements in the two-phase jet. Finally, the part of greatest interest, the turbulent mixing, isdescribed in section 4.4.4.1 Initial experimentsBefore starting the two-phase jet experiment, it is important to consider the important flowproperties. Therefore, a number of initial experiments are performed, described below.4.1.1 Laminar-turbulent transitionTo get a first impression of the behaviour of the jet, a visualisation experiment is done by addingfluorescein to the water. In the figures below, jets are depicted for two different Reynolds numbers.The width of the laminar part of the jet is 0.83 mm. The black dots are air bubbles.Figure 4.1: Visualisation of a jet with fluorescein at Re jet = 800.The laminar-turbulent transition takes place at a jet Reynolds number of approximately 600. Inbetween 600 and 900, intermittency is observed: the position of the transition point is oscillating,causing the jet to be partly laminar and partly turbulent (see figure 4.1). To have a continuouslyturbulent jet, the Reynolds number is chosen at approximately 1000 (see figure 4.2), correspondingto an initial average jet velocity of 1.2 m/s (see equation (2.1)) and a volume flow rate, Φ jet , of0.65 ml/s. The required height difference, ∆h, between the reservoir and the outlet of the coflowis 155 cm. Equation (2.40) estimates a centreline velocity at (z − z0) = 75 - 150 mm at 97 - 4931

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