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Experimental study of the heated contact line region for a pure fluid and binary fluid mixture in microgravity.pdf

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Experimental study of the heated contact line region for a pure fluid and binary fluid mixture in microgravity.pdf

Journal of Colloid and Interface Science 488 (2017) 48–60 Contents lists available at ScienceDirect Journal of Colloid and Interface Science journal homepage: /locate/jcis Experimental study of the heated contact line region for a pure ?uid and binary ?uid mixture in microgravity Thao T.T. Nguyen a, Akshay Kundan a, Peter C. Wayner Jr. a, Joel L. Plawsky a,?, David F. Chao b, Ronald J. Sicker b a The Howard P. Isermann Department of Chemical and Biological Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180, USA b NASA Glenn Research Center, Cleveland, OH 44135, USA graphical abstract article info Article history: Received 16 August 2016 Revised 25 October 2016 Accepted 27 October 2016 Available online 28 October 2016 Keywords: Contact line region Ideal liquid mixture Concentration Heat pipe abstract Understanding the dynamics of phase change heat and mass transfer in the three-phase contact line region is a critical step toward improving the ef?ciency of phase change processes. Phase change becomes especially complicated when a ?uid mixture is used. In this paper, a wickless heat pipe was operated on the International Space Station (ISS) to study the contact line dynamics of a pentane/isohexane mixture. Different interfacial regions were identi?ed, compared, and studied. Using high resolution (50?), interference images, we calculated the curvature gradient of the liquid-vapor interface at the contact line region along the edges of the heat pipe. We found that the curvature gradient in the evaporation region increases with increasing heat ?ux magnitude and decreasing pentane concentration. The curvature gradient for the mixture case is larger than for the pure pentane case. The difference between the two cases increases as pentane concentration decreases. Our data showed that the curvature gradient pro?le within the evaporation section is separated into two regions with the boundary between the two corresponding to the location of a thick, liquid, ‘‘centra