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Competition of intrinsic and topographically imposed patterns in Benard-Marangoni convection

Ismagilov, Rustem F. and Rosmarin, David and Gracias, David H. and Stroock, Abraham D. and Whitesides, George M. (2001) Competition of intrinsic and topographically imposed patterns in Benard-Marangoni convection. Applied Physics Letters, 79 (3). pp. 439-441. ISSN 0003-6951. doi:10.1063/1.1384473.

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The structure of Benard-Marangoni convection cells can be controlled by periodic topographic patterns on the heated surface that generates the convection. When the periodicity of the topographic pattern matches the intrinsic periodicity of the convection cells, a convective pattern is formed that is 1:1 commensurate with the topographic pattern. Arrays of hexagonal, square, and triangular convection cells were generated over the appropriately designed topographic patterns, and visualized by infrared imaging. For imposed patterns with periodicity in two dimensions, as the ratio of the intrinsic and perturbing length scales changes, the pattern of the convection cells shows sharp transitions between different patterns commensurate with the imposed pattern. For imposed patterns with periodicity in one dimension (i.e., lines) the convection cells use the unconstrained dimension to adapt continuously to the external perturbation. Topographically controlled convection cells can be used to assemble microscopic particles into externally switchable regular lattices. (C) 2001 American Institute of Physics.

Item Type:Article
Related URLs:
URLURL TypeDescription
Ismagilov, Rustem F.0000-0002-3680-4399
Whitesides, George M.0000-0001-9451-2442
Additional Information:© 2001 American Institute of Physics. (Received 15 March 2001; accepted 18 May 2001) This work was supported by DoE under Grant No. 00ER45852. The authors thank Howard Stone (Harvard) for many valuable discussions, and Allen Frechette and Kellie Reardon (FLIR Systems), and John Boucher (Harvard University) for technical assistance with IR imaging and for providing the IR camera used in this work.
Funding AgencyGrant Number
Department of Energy (DOE)00ER45852
Subject Keywords:commensurate; equilibrium; systems; layers; Benard convection, flow visualisation, infrared imaging, periodic structures
Issue or Number:3
Classification Code:PACS 47.54.-r Pattern selection; pattern formation 47.27.T- Turbulent transport processes 47.80.-v Instrumentation and measurement methods in fluid dynamics
Record Number:CaltechAUTHORS:20130821-160720076
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:40801
Deposited By: Whitney Barlow
Deposited On:26 Aug 2013 23:35
Last Modified:10 Nov 2021 00:08

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