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.
| Translated title of the contribution | Flow behaviour of negatively buoyant jets in immiscible ambient fluid |
|---|---|
| Original language | English |
| Pages (from-to) | 261-271 |
| Number of pages | 11 |
| Journal | Experiments in Fluids |
| Volume | 52 |
| Issue number | 1 |
| Early online date | 25 Oct 2011 |
| DOIs | |
| Publication status | E-pub ahead of print - 25 Oct 2011 |
Keywords
- flow regime
- interfacial tension
- momentum flux
- Richardson number
- viscosity ratio