Entrainment into two-dimensional and axisymmetric turbulent gravity currents

@article{Hallworth1996EntrainmentIT,
  title={Entrainment into two-dimensional and axisymmetric turbulent gravity currents},
  author={Mark A. Hallworth and Herbert E. Huppert and Jeremy C. Phillips and R. Stephen J. Sparks},
  journal={Journal of Fluid Mechanics},
  year={1996},
  volume={308},
  pages={289 - 311}
}
Entrainment of ambient fluid into both two-dimensional and axisymmetric gravity currents is investigated experimentally using a novel neutralization technique. The technique involves the titrative neutralization of an alkaline gravity current which intrudes into and entrains an acidic ambient, and is visualized using a pH indicator solution. Using this technique, we can determine quantitative results for the amount of dilution in the head of the current. The head of the current is able to… 

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References

SHOWING 1-10 OF 23 REFERENCES

Entrainment in turbulent gravity currents

LABORATORY gravity currents are frequently used to model a range of environmental and industrial flows1. The manner in which these flows become diluted with distance by the surrounding fluid has

The slumping of gravity currents

Experimental results for the release of a fixed volume of one homogeneous fluid into another of slightly different density are presented. From these results and those obtained by previous

Experiments on the dynamics of a gravity current head

Some of the dense fluid at the front of an advancing gravity current is observed to be mixed with the ambient fluid. This process continues when the cross-stream non-uniformities at the head of the

Turbulent entrainment: the development of the entrainment assumption, and its application to geophysical flows

  • J. Turner
  • Environmental Science, Physics
    Journal of Fluid Mechanics
  • 1986
The entrainment assumption, relating the inflow velocity to the local mean velocity of a turbulent flow, has been used successfully to describe natural phenomena over a wide range of scales. Its

Particle-driven gravity currents

Gravity currents created by the release of a fixed volume of a suspension into a lighter ambient fluid are studied theoretically and experimentally. The greater density of the current and the

Gravity currents and related phenomena

This paper presents a broad investigation into the properties of steady gravity currents, in so far as they can be represented by perfect-fluid theory and simple extensions of it (like the classical

Studies on gravitational spreading currents

The objective of this investigation is to examine the buoyancy-driven gravitational spreading currents, especially as applied to ocean disposal of wastewater and the accidental release of hazardous

Turbulent gravitational convection from maintained and instantaneous sources

  • B. MortonG. TaylorJ. Turner
  • Physics, Environmental Science
    Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences
  • 1956
Theories of convection from maintained and instantaneous sources of buoyancy are developed, using methods which are applicable to stratified body fluids with any variation of density with height;

Mixing in Thermals with and without Buoyancy Reversal

Abstract The mixing characteristics of turbulent thermals were investigated in a water tank via laser-induced fluorescence techniques. The concentration of mixed fluid in the far field of a

Structure in turbulent mixing layers and wakes using a chemical reaction

Plane turbulent mixing between two streams of water which contained dilute chemical reactants was studied in a new blow-down water tunnel. In a diffusion-limited reaction, a pH indicator,