NDLI: Turbulent ‘stopping plumes’ and plume pinch-off in uniform surroundings

Content Provider	Springer Nature Link
Author	Kattimeri, Athina Scase, Matthew M.
Copyright Year	2014
Abstract	Observations of turbulent convection in the environment are of variously sustained plume-like flows or intermittent thermal-like flows. At different times of the day the prevailing conditions may change and consequently the observed flow regimes may change. Understanding the link between these flows is of practical importance meteorologically, and here we focus our interest upon plume-like regimes that break up to form thermal-like regimes. It has been shown that when a plume rises from a boundary with low conductivity, such as arable land, the inability to maintain a rapid enough supply of buoyancy to the plume source can result in the turbulent base of the plume separating and rising away from the source. This plume ‘pinch-off’ marks the onset of the intermittent thermal-like behavior. The dynamics of turbulent plumes in a uniform environment are explored in order to investigate the phenomenon of plume pinch-off. The special case of a turbulent plume having its source completely removed, a ‘stopping plume’, is considered in particular. The effects of forcing a plume to pinch-off, by rapidly reducing the source buoyancy flux to zero, are shown experimentally. We release saline solution into a tank filled with fresh water generating downward propagating steady turbulent plumes. By rapidly closing the plume nozzle, the plumes are forced to pinch-off. The plumes are then observed to detach from the source and descend into the ambient. The unsteady buoyant region produced after pinch-off, cannot be described by the power-law behavior of either classical plumes or thermals, and so the terminology ‘stopping plume’ (analogous to a ‘starting plume’) is adopted for this type of flow. The propagation of the stopping plume is shown to be approximately linearly dependent on time, and we speculate therefore that the closure of the nozzle introduces some vorticity into the ambient, that may roll up to form a vortex ring dominating the dynamics of the base of a stopping plume.
Starting Page	923
Ending Page	937
Page Count	15
File Format	PDF
ISSN	15677419
Journal	Environmental Fluid Mechanics
Volume Number	15
Issue Number	5
e-ISSN	15731510
Language	English
Publisher	Springer Netherlands
Publisher Date	2014-09-27
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Plume-thermal transition Turbulent buoyant plumes Plume pinch-off Reduced buoyancy flux Experimental investigation Turbulent convection Earth Sciences Environmental Physics Hydrology/Water Resources Mechanics Hydrogeology Oceanography
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Water Science and Technology

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Turbulent ‘stopping plumes’ and plume pinch-off in uniform surroundings

Plume rise and spread in buoyant releases from elevated sources in the lower atmosphere

Warm discharges in cold fresh water: 2. Numerical simulation of laminar line plumes

On the modelling of steady turbulent fountains

Removing the boundary influence on negatively buoyant jets

Large eddy simulations of 45° inclined dense jets

Surface thermal structure in a shallow-water, vertical discharge from a coastal power plant

Statistical properties of concentration fluctuations in two merging plumes

A recycling method for the large-eddy simulation of plumes in the atmospheric boundary layer

Turbulent ‘stopping plumes’ and plume pinch-off in uniform surroundings

Similar Documents

Turbulent ‘stopping plumes’ and plume pinch-off in uniform surroundings

Plume rise and spread in buoyant releases from elevated sources in the lower atmosphere

Warm discharges in cold fresh water: 2. Numerical simulation of laminar line plumes

On the modelling of steady turbulent fountains

Removing the boundary influence on negatively buoyant jets

Large eddy simulations of 45° inclined dense jets

Surface thermal structure in a shallow-water, vertical discharge from a coastal power plant

Statistical properties of concentration fluctuations in two merging plumes

A recycling method for the large-eddy simulation of plumes in the atmospheric boundary layer

Turbulent ‘stopping plumes’ and plume pinch-off in uniform surroundings