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Capillary Pumping between Droplets on Superhydrophobic Surfaces
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  • shiva moradi,
  • Mohammad Charsooghi,
  • Luca Businaro,
  • Mehdi Habibi,
  • Ali-Reza Moradi
shiva moradi

Corresponding Author:sh.moradimehr@iasbs.ac.ir

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Mohammad Charsooghi
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Luca Businaro
Institute of Photonics and Nanotechnologies National Research Council
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Mehdi Habibi
Wageningen Universiteit en Researchcentrum
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Ali-Reza Moradi
Institute for Advanced Studies in Basic Sciences
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The famous two-balloon experiment involves two identical balloons filled up with air and connected via a hollow tube, and upon onsetting the experiment one of the balloons shrinks and the other expands. Here, we present the liquid version of that experiment. We use superhydrophobic (SHP) substrates to form spherical droplets and connect them with a capillary channel. Different droplet sizes, substrates of different hydrophobicities, and various channel pathways are investigated, and morphometric parameters of the droplets are measured through image processing. In the case of SHP substrates the pumping is from the smaller droplet to the larger one, similar to the two-balloon experiment. However, if one or both of the droplets are positioned on a normal substrate the curvature radius will indicate the direction of pumping. We interpret the results by considering the Laplace pressures and the surface tension applied by the channel at the connecting points.
01 Nov 2021Submitted to AIChE Journal
03 Nov 2021Submission Checks Completed
03 Nov 2021Assigned to Editor
14 Nov 2021Reviewer(s) Assigned
24 Mar 2022Editorial Decision: Revise Minor
22 Apr 20221st Revision Received
24 Apr 2022Submission Checks Completed
24 Apr 2022Assigned to Editor
26 Apr 2022Reviewer(s) Assigned
09 Jun 2022Editorial Decision: Revise Minor
04 Jul 20222nd Revision Received
13 Jul 2022Submission Checks Completed
13 Jul 2022Assigned to Editor
01 Aug 2022Editorial Decision: Accept
18 Aug 2022Published in AIChE Journal. 10.1002/aic.17847