Flow behaviour of negatively buoyant jets in immiscible ambient fluid

Revision as of 13:16, 6 March 2019

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 Failed to parse (syntax error): Ri (8 X 10^{−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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	== Abstract ==		== 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 (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.	+	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.

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