Natural versus forced convection in laminar starting plumes

@article{Rogers2009NaturalVF,
  title={Natural versus forced convection in laminar starting plumes},
  author={Michael C. Rogers and Stephen W Morris},
  journal={Physics of Fluids},
  year={2009},
  volume={21},
  pages={083601}
}
A starting plume or jet has a well-defined, evolving head that is driven through the surrounding quiescent fluid by a localized flux of either buoyancy or momentum, or both. We studied the scaling and morphology of starting plumes produced by a constant flux of buoyant fluid from a small, submerged outlet. The plumes were laminar and spanned a wide range of plume Richardson numbers Ri. Ri is the dimensionless ratio of the buoyancy forces to inertial effects and thus our measurements crossed… 

Figures and Tables from this paper

Buoyant Plumes with Inertial and Chemical Reaction-driven Forcing
Buoyant plumes with inertial and chemical reaction-driven forcing Michael C. Rogers Doctor of Philosophy Graduate Department of Physics University of Toronto 2010 Plumes are formed when a continuous
Numerical study of laminar starting forced plumes at high Schmidt number
We consider an isothermal binary mixture of glycerol-water for Schmidt numbers around 6 ·104−6 ·105 filling a tank where a light binary mixture is injected in the center of the bottom wall. The
Numerical study of laminar starting plumes at high Schmidt number
We consider an isothermal binary mixture of glycerol-water for Schmidt numbers around 6 ·104−6 ·105 filling a tank where a light binary mixture is injected in the center of the bottom wall. The
Temperature and velocity measurements of a rising thermal plume
The three-dimensional velocity and temperature fields surrounding an isolated thermal plume in a fluid with temperature-dependent viscosity are measured using Particle-Image Velocimetry and
Anatomy of a laminar starting thermal plume at high Prandtl number
We present an experimental study of the dynamics of a plume generated from a small heat source in a high Prandtl number fluid with a strongly temperature-dependent viscosity. The velocity field was
Dynamics of a laminar plume in a cavity: The influence of boundaries on the steady state stem structure
[1] The steady state structure of thermal plumes rising from a small heater is studied in high Prandtl number fluids. We show good agreement between laboratory experiments and numerical simulations.
An experimental study of a starting plume on a mountain
Numerical study on the dynamic process of single plume flow in thermal convection with polymers
A direct numerical simulation of single plume flow in thermal convection with polymers was carried out in a domain with 1:3 as the width to height ratio. The heat transport ability is weakened by
Buoyant flows on a vertical cone
The heads and tails of buoyant autocatalytic balls.
TLDR
Numerically investigate the evolution of autocatalytic iodate-arsenous acid reaction fronts initialized in spherical configurations and find that depending on the initial ball radius, the reaction front will develop in one of three different ways.
...
1
2
...

References

SHOWING 1-10 OF 30 REFERENCES
Entrainment and stirring in viscous plumes
Buoyant plumes in very viscous fluids, although laminar, entrain their surroundings as a result of conduction of heat. Once heated, the fluid takes part in the plume motion and is stirred within the
Buoyant plumes and vortex rings in an autocatalytic chemical reaction.
TLDR
In this type of autocatalytic plume, entrainment assists the reaction, producing new buoyancy which fuels an accelerating plume head which detaches from the upwelling conduit, forming an accelerating, buoyant vortex ring.
Turbulent Jets and Plumes
Turbulent jets are fluid flows produced by a pressure drop through an orifice. Their mechanics, although studied for over fifty years, has recently received research attention that has resulted in a
Four dynamical regimes for a starting plume model
The growth of two-dimensional plumes was modeled numerically to study the dynamics of plumes with Rayleigh numbers in the range of 104 to 108 and Prandtl numbers in the range of 0.025 to 10 000. In
Laminar starting plumes in high-Prandtl-number fluids
Experimental studies of laminar axisymmetric starting plumes are performed to investigate the dependence of the flow on the Prandtl number, focusing on large Prandtl numbers. Thermal plumes are
The ‘starting plume’ in neutral surroundings
The advancing front of a buoyant plume which is being established in uniform surroundings has some properties in common with the plume, while in other respects it behaves more like a ‘thermal’
An experimental study of laminar plumes
We present an experimental study of the scaling laws for the front (or cap) of an isolated, laminar starting plume. The scaling relations are formulated and measured experimentally over a range of
Some laminar thermal and plume experiments
Laboratory observations of the gravitational convection resulting from ’’point’’ source buoyancy (heat) injection in a stationary, unstratified fluid are described. These include various formation
Velocity field measurements of a laminar starting plume
The region of buoyant fluid resulting from the initiation of heating of an infinite fluid is called the starting plume. Here, velocity field measurements of this flow pattern are presented for the
A model for vortex ring formation in a starting buoyant plume
Vortex ring formation in a starting axisymmetric buoyant plume is considered. A model describing the process is proposed and a physical explanation based on the Kelvin–Benjamin variational principle
...
1
2
3
...