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Wasnik PS, N'guessan HE, Tadmor R. Controlling arbitrary humidity without convection. J Colloid Interface Sci. 2015;455:212-9doi: 10.1016/j.jcis.2015.04.072.
Wasnik, P. S., N'guessan, H. E., & Tadmor, R. (2015). Controlling arbitrary humidity without convection. Journal of colloid and interface science, 455212-9. https://doi.org/10.1016/j.jcis.2015.04.072
Wasnik, Priyanka S, et al. "Controlling arbitrary humidity without convection." Journal of colloid and interface science vol. 455 (2015): 212-9. doi: https://doi.org/10.1016/j.jcis.2015.04.072
Wasnik PS, N'guessan HE, Tadmor R. Controlling arbitrary humidity without convection. J Colloid Interface Sci. 2015 Oct 01;455:212-9. doi: 10.1016/j.jcis.2015.04.072. Epub 2015 May 29. PMID: 26072445.
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J Colloid Interface Sci. 2015 Oct 01;455:212-9. doi: 10.1016/j.jcis.2015.04.072. Epub 2015 May 29.

Controlling arbitrary humidity without convection.

Journal of colloid and interface science

Priyanka S Wasnik, Hartmann E N'guessan, Rafael Tadmor

Affiliations

  1. Dan F. Smith Dept. of Chemical Engineering, Lamar University, Beaumont, TX 77710, United States.
  2. Dan F. Smith Dept. of Chemical Engineering, Lamar University, Beaumont, TX 77710, United States. Electronic address: [email protected].

PMID: 26072445 DOI: 10.1016/j.jcis.2015.04.072

Abstract

In this paper we show a way that allows for the first time to induce arbitrary humidity of desired value for systems without convective flow. To enable this novelty we utilize a semi-closed environment in which evaporation is not completely suppressed. In this case, the evaporation rate is determined both by the outer (open) humidity and by the inner (semi-closed) geometry including the size/shape of the evaporating medium and the size/shape of the semi-closure. We show how such systems can be used to induce desired humidity conditions. We consider water droplet placed on a solid surface and study its evaporation when it is surrounded by other drops, hereon "satellite" drops and covered by a semi-closed hemisphere. The main drop's evaporation rate is proportional to its height, in agreement with theory. Surprisingly, however, the influence of the satellite drops on the main drop's evaporation suppression is not proportional to the sum of heights of the satellite drops. Instead, it shows proportionality close to the satellite drops' total surface area. The resultant humidity conditions in the semi-closed system can be effectively and accurately induced using different satellite drops combinations.

Copyright © 2015 Elsevier Inc. All rights reserved.

Keywords: Controlled humidity; Evaporation flux; Evaporation rate; Evaporation suppression; Maxwell equation; Relative humidity; Rowan equation; Satellite drop; Surface phenomena

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