Session RU: Particle Laden Flows III

3:05 PM–4:36 PM, Tuesday, November 23, 2010
Hyatt Regency Long Beach Room: Regency A

Chair: Evan Variano, University of California, Berkeley

Abstract ID: BAPS.2010.DFD.RU.7

Abstract: RU.00007 : Coffee ring deposition in bands

4:23 PM–4:36 PM

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  Shreyas Mandre
    (Brown University)

  Ning Wu
    (Colorado School of Mines)

  Joanna Aizenberg
    (Harvard University)

  Lakshminarayanan Mahadevan
    (Harvard University)

Microscopic particles suspended in a liquid are transported and deposited at a contact line, as the contact line recedes due to evaporation. A particle layer of uniform thickness is deposited if the particle concentration is above a threshold; below this threshold the deposit forms periodic bands oriented parallel to the contact line. We present a model for the formation of these bands based on evaporation leading to the breakup of the thin liquid film near the contact line. The threshold results from a competition between evaporation speed and deposition speed. Using this model, we predict the thickness and length of the bands, making the control of patterned deposition possible.

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