Publications
38 results found
Burridge HC, Parker D, Kruger E, et al., 2016, The significance of engulfment in the process of turbulent entrainment by plumes, VIIIth Int. Symp. on Stratified Flows, Publisher: University of California
We present simultaneous two-dimensional velocity and scalar concentrations measuredon a central vertical plane in a turbulent plume. We use an edge-detection algorithm todetermine the scalar plume edge, and compare the data obtained in both a fixed Eulerianframe and relative to local plume coordinates defined in terms of the instantaneous plumeedge. We observe that the time-averaged distributions of vertical and horizontal velocityare self-similar. Measurements in the plume coordinate show that there is significantvertical flow outside the edge of the plume, contrary to the classical notion of purelyhorizontal velocities at the plume edge. We observe large variations in the plume widthand reason these to be due to the passage of large coherent eddies. The flow within theplume and in the nearby ambient fluid depends on whether an eddy is present or absent.When an eddy is present and the plume is wide, the vertical velocities near the plume edgeare small, but in regions where the plume is narrow and there is no eddy, large verticalvelocities are observed outside the plume.
Burridge HC, Partridge JL, Linden PF, 2016, The fluxes and behaviour of plumes inferred from measurements of coherent structures within images of the bulk flow, Atmosphere-Ocean, Vol: 54, Pages: 403-417, ISSN: 0705-5900
This paper describes how measurements of the movement of identifiable features at the edge of a turbulent plume can be interpreted to determine the properties of the mean flow and consequently, using plume theory, can be used to make estimates of the fluxes of volume (mass), momentum, and buoyancy in a plume. This means that video recordings of smoke rising from a chimney or buoyant material from a source on the sea bed can be used to make accurate estimates of the source conditions for the plume. At best we can estimate the volume flux and buoyancy flux to within about 5% and 15% of the actual values, respectively. Although this is restricted to the case of a plume rising in a stationary and unstratified environment, we show that the results may be of practical use in other more complex situations. In addition, we demonstrate that large-scale (turbulent) coherent structures at the plume edge form on a scale approximately 40% of the local (mean) plume half-width and travel at almost 60% of the average local (mean) velocity in the plume.
Burridge HC, Hunt GR, 2016, Entrainment by turbulent fountains, Journal of Fluid Mechanics, Vol: 790, Pages: 407-418, ISSN: 1469-7645
Experimental measurements of entrainment by turbulent fountains from circular sources in quiescent uniform environments are presented. Our results span almost four orders of magnitude in the source Froude number (0.004⩽Fr0⩽250.004⩽Fr0⩽25) and thereby encompass the entrainment across all classes of fountain behaviour identified to date. We identify scalings for the entrained volume flux QEQE, in terms of Fr0Fr0 and the source volume flux Q0Q0, within a number of distinct Froude-number bands corresponding to each class of fountain. Additionally we identify a distinct class of new behaviour, as yet unreported, for Fr0≲0.1Fr0≲0.1.
Burridge HC, Mistry A, Hunt GR, 2015, The effect of source Reynolds number on the rise height of a fountain, PHYSICS OF FLUIDS, Vol: 27, ISSN: 1070-6631
- Author Web Link
- Cite
- Citations: 16
Hunt GR, Burridge HC, 2015, Fountains in Industry and Nature, ANNUAL REVIEW OF FLUID MECHANICS, VOL 47, Vol: 47, Pages: 195-220, ISSN: 0066-4189
- Author Web Link
- Cite
- Citations: 63
Burridge HC, Hunt GR, 2014, Scaling arguments for the fluxes in turbulent miscible fountains, JOURNAL OF FLUID MECHANICS, Vol: 744, Pages: 273-285, ISSN: 0022-1120
- Author Web Link
- Cite
- Citations: 11
Burridge HC, Hunt GR, 2013, The rhythm of fountains: the length and time scales of rise height fluctuations at low and high Froude numbers, JOURNAL OF FLUID MECHANICS, Vol: 728, Pages: 91-119, ISSN: 0022-1120
- Author Web Link
- Cite
- Citations: 38
Burridge HC, Hunt GR, 2012, The rise heights of low- and high-Froude-number turbulent axisymmetric fountains, JOURNAL OF FLUID MECHANICS, Vol: 691, Pages: 392-416, ISSN: 0022-1120
- Author Web Link
- Cite
- Citations: 54
This data is extracted from the Web of Science and reproduced under a licence from Thomson Reuters. You may not copy or re-distribute this data in whole or in part without the written consent of the Science business of Thomson Reuters.