Experimental investigation of transient thermal convection in porous media
Experimental investigation of transient thermal convection in porous media
A laboratory experiment of transient thermal convection in a 1-m-high cell was conducted to compare the length and time scales of plume development to theory. The temperature field was resolved to less than 1 mm and was measured by dissolving a solution of thermochromic crystals into the water–glycerin working fluid. The time-dependent experiment was run by applying heat at the bottom boundary that eventually was 6oC above the background temperature of the fluid. After development of a thermal boundary layer, the instability became visible at 26 min, with the development of 11, 3–4 cm width plumes growing from the boundary layer. The initially rapid growth rate reached a limiting velocity of approximately 0.5 cm min-1, and then decelerated throughout the experiment. Plumes interacted primarily by merging together; by the end of the experiment only three plumes were present. The Nusselt number at the onset of convection was 10, although it dropped to 4 after 45 min, which would be expected of a barely unstable system.
335-347
Cooper, C.A.
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Crews, J.B.
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Schumer, R.
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Breitmeyer, R.J.
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Voepel, H.
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Decker, D.L.
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September 2014
Cooper, C.A.
645bf710-bb8b-4afb-9af4-cf084a8d5d70
Crews, J.B.
e98c8d3e-3e60-4aa1-b41e-0b3146819de0
Schumer, R.
299fa974-8574-4fe4-af60-b48668aa2088
Breitmeyer, R.J.
bf169820-b7f0-4726-9bdb-fa875d9c8bb4
Voepel, H.
7330972a-c61c-4058-b52c-3669fadfcf70
Decker, D.L.
f3989257-c905-499d-8842-d56be2af33c5
Cooper, C.A., Crews, J.B., Schumer, R., Breitmeyer, R.J., Voepel, H. and Decker, D.L.
(2014)
Experimental investigation of transient thermal convection in porous media.
Transport in Porous Media, 104 (2), .
(doi:10.1007/s11242-014-0337-0).
Abstract
A laboratory experiment of transient thermal convection in a 1-m-high cell was conducted to compare the length and time scales of plume development to theory. The temperature field was resolved to less than 1 mm and was measured by dissolving a solution of thermochromic crystals into the water–glycerin working fluid. The time-dependent experiment was run by applying heat at the bottom boundary that eventually was 6oC above the background temperature of the fluid. After development of a thermal boundary layer, the instability became visible at 26 min, with the development of 11, 3–4 cm width plumes growing from the boundary layer. The initially rapid growth rate reached a limiting velocity of approximately 0.5 cm min-1, and then decelerated throughout the experiment. Plumes interacted primarily by merging together; by the end of the experiment only three plumes were present. The Nusselt number at the onset of convection was 10, although it dropped to 4 after 45 min, which would be expected of a barely unstable system.
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e-pub ahead of print date: 12 June 2014
Published date: September 2014
Organisations:
Geography & Environment
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Local EPrints ID: 394159
URI: http://eprints.soton.ac.uk/id/eprint/394159
ISSN: 0169-3913
PURE UUID: bf46d7e5-79cb-41b9-aee5-5e124021bbfa
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Date deposited: 11 May 2016 11:16
Last modified: 15 Mar 2024 03:50
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Author:
C.A. Cooper
Author:
J.B. Crews
Author:
R. Schumer
Author:
R.J. Breitmeyer
Author:
H. Voepel
Author:
D.L. Decker
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