2024-03-29T11:26:36Z
https://eprints.maths.manchester.ac.uk/cgi/oai2
oai:eprints.maths.manchester.ac.uk.MIMS.EPrints:440
2017-10-20T14:12:13Z
7374617475733D707562
7375626A656374733D50414353:504143535F3430:504143535F3437
7375626A656374733D50414353:504143535F3630:504143535F3638
74797065733D61727469636C65
https://eprints.maths.manchester.ac.uk/440/
Suppression of dripping from a ceiling
Burgess, John M.
Juel, Anne
McCormick, W.D.
Swift, J.B.
Swinney, Harry L.
47 Fluid dynamics
68 Surfaces and interfaces; thin films and low-dimensional systems (structure and nonelectronic properties)
An isothermal layer suspended from a surface is gravitationally (Rayleigh-Taylor) unstable. We find that, when a vertical temperature difference ΔT above a critical value (ΔT)c is imposed across the liquid-gas layer system (heated from below), the restoring force provided by the temperature-dependent surface tension (thermocapillarity) can stabilize the layer. Our measurements of the most unstable wave number for ΔT<(ΔT)c agree well with our linear stability analysis. The instability occurs at long wavelengths: the most unstable wavelength at (ΔT)c is infinite.
2001
Article
PeerReviewed
application/pdf
en
https://eprints.maths.manchester.ac.uk/440/1/p1203_1.pdf
Burgess, John M. and Juel, Anne and McCormick, W.D. and Swift, J.B. and Swinney, Harry L. (2001) Suppression of dripping from a ceiling. Physical Review Letters, 86 (7). pp. 1203-1206. ISSN 0031-9007
http://link.aps.org/abstract/PRL/v86/p1203
10.1103/PhysRevLett.86.1203
10.1103/PhysRevLett.86.1203
oai:eprints.maths.manchester.ac.uk.MIMS.EPrints:442
2017-10-20T14:12:13Z
7374617475733D707562
7375626A656374733D50414353:504143535F3430:504143535F3437
7375626A656374733D50414353:504143535F3630:504143535F3638
74797065733D61727469636C65
https://eprints.maths.manchester.ac.uk/442/
Three-dimensional free convection in molten gallium
Juel, A.
Mullin, T.
Ben Hadid, H.
Henry, D.
47 Fluid dynamics
68 Surfaces and interfaces; thin films and low-dimensional systems (structure and nonelectronic properties)
Convective flow of molten gallium is studied in a small-aspect-ratio rectangular, differentially heated enclosure. The three-dimensional nature of the steady flow is clearly demonstrated by quantitative comparison between experimental temperature measurements, which give an indication of the strength of the convective flow, and the results of numerical simulations. The three-dimensional flow structure is characterized by cross-flows which are an order of magnitude smaller than the main circulation, and spread from the endwall regions to the entire enclosure when the Grashof number is increased beyond Gr = 104. The mergence of these effects in the centre of the enclosure leads to a complex central divergent flow structure which underpins the observed transition to oscillatory convection.
2001
Article
PeerReviewed
application/pdf
en
https://eprints.maths.manchester.ac.uk/442/1/S0022112001003937a.pdf
Juel, A. and Mullin, T. and Ben Hadid, H. and Henry, D. (2001) Three-dimensional free convection in molten gallium. Journal of Fluid Mechanics, 436. pp. 267-281. ISSN 0022-1120
http://journals.cambridge.org/action/displayIssue?iid=77652
10.1017/S0022112001003937
10.1017/S0022112001003937
oai:eprints.maths.manchester.ac.uk.MIMS.EPrints:443
2017-10-20T14:12:13Z
7374617475733D707562
7375626A656374733D50414353:504143535F3430:504143535F3437
7375626A656374733D50414353:504143535F3630:504143535F3638
74797065733D61727469636C65
https://eprints.maths.manchester.ac.uk/443/
Magnetohydrodynamic damping of convective flows in molten gallium
Hof, B.
Juel, A.
Mullin, T.
47 Fluid dynamics
68 Surfaces and interfaces; thin films and low-dimensional systems (structure and nonelectronic properties)
We report the results of an experimental study of magnetohydrodynamic damping of sidewall convection in a rectangular enclosure filled with gallium. In particular we investigate the suppression of convection when a steady magnetic field is applied separately in each of the three principal directions of the flow. The strongest damping of the steady flow is found for a vertical magnetic field, which is in agreement with theory. However, we observe that the application of a field transverse to the flow provides greater damping than a longitudinal one, which seems to contradict available theory. We provide a possible resolution of this apparent dichotomy in terms of the length scale of the experiment.
2003
Article
PeerReviewed
application/pdf
en
https://eprints.maths.manchester.ac.uk/443/1/S0022112003004014a.pdf
Hof, B. and Juel, A. and Mullin, T. (2003) Magnetohydrodynamic damping of convective flows in molten gallium. Journal of Fluid Mechanics, 482. pp. 163-179. ISSN 0022-1120
http://journals.cambridge.org/action/displayIssue?iid=150482
10.1017/S0022112003004014
10.1017/S0022112003004014