Flow behaviour of negatively buoyant jets in immiscible ambient fluid

Latest revision as of 16:05, 20 November 2019

Published in Experiments in Fluids Vol. 52 (1), pp. 261–271, 2012
doi: 10.1007/s00348-011-1217-9

Abstract

In this paper we investigate experimentally the injection of a negatively buoyant jet into a homogenous immiscible ambient fluid. Experiments are carried out by injecting a jet of dyed fresh water through a nozzle in the base of a cylindrical tank containing rapeseed oil. The fountain inlet flow rate and nozzle diameter were varied to cover a wide range of Richardson $Ri(8x10^{-4}<Ri<1.98)$ , Reynolds $Re(467<Re<5,928)$ and Weber $We(2.40<We<308.56)$ numbers. Based on the $Re,Ri$ and $We$ values for the experiments, we have determined a regime map to define how these values may control the occurrence of the observed flow types. Whereas $Ri$ plays a stronger role when determining the maximum penetration height, the effect of the Reynolds number is stronger predicting the flow behaviour for a specific nozzle diameter and injection velocity.

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+Published in ''Experiments in Fluids'' Vol. 52 (1), pp. 261–271, 2012<br />
+doi: 10.1007/s00348-011-1217-9
 == Abstract ==
-In this paper we investigate experimentally the injection of a negatively buoyant jet into a homogenous immiscible ambient fluid. Experiments are carried out by injecting a jet of dyed fresh water through a nozzle in the base of a cylindrical tank containing rapeseed oil. The fountain inlet flow rate and nozzle diameter were varied to cover a wide range of Richardson <math>Ri ( 10^{−4} < Ri < 1.98)</math>, Reynolds <math>Re (467 < Re < 5,928)</math> and Weber <math>We (2.40 < We < 308.56)</math> numbers. Based on the <math>Re, Ri</math> and <math>We</math> values for the experiments, we have determined a regime map to define how these values may control the occurrence of the observed flow types. Whereas <math>Ri</math> plays a stronger role when determining the maximum penetration height, the effect of the Reynolds number is stronger predicting the flow behaviour for a specific nozzle diameter and injection velocity.
+In this paper we investigate experimentally the injection of a negatively buoyant jet into a homogenous immiscible ambient fluid. Experiments are carried out by injecting a jet of dyed fresh water through a nozzle in the base of a cylindrical tank containing rapeseed oil. The fountain inlet flow rate and nozzle diameter were varied to cover a wide range of Richardson <math>Ri (8 x 10^{-4} < Ri < 1.98)</math>, Reynolds <math>Re (467 < Re < 5,928)</math> and Weber <math>We (2.40 < We < 308.56)</math> numbers. Based on the <math>Re, Ri</math> and <math>We</math> values for the experiments, we have determined a regime map to define how these values may control the occurrence of the observed flow types. Whereas <math>Ri</math> plays a stronger role when determining the maximum penetration height, the effect of the Reynolds number is stronger predicting the flow behaviour for a specific nozzle diameter and injection velocity.
+<pdf>Media:Draft_Samper_803197447_7459_Geyer2012_Article_FlowBehaviourOfNegativelyBuoya.pdf</pdf>

Latest revision as of 16:05, 20 November 2019

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