Flow behaviour of negatively buoyant jets in immiscible ambient fluid |
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| Authors: | A. Geyer J. C. Phillips M. Mier-Torrecilla S. R. Idelsohn E. O?ate |
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| Affiliation: | (1) CIMNE International Center for Numerical Models in Engineering, UPC Campus Norte, Edificio C1, C/Gran Capit?n s/n, 08034 Barcelona, Spain;(2) Institute of Earth Sciences Jaume Almera, CSIC, c/Lluis Sol? i Sabaris s/n, 08028 Barcelona, Spain;(3) Department of Earth Sciences, University of Bristol, Wills Memorial Building, Queen’s Road, Bristol, BS8 1RJ, UK |
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| 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 (8 × 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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