Superhydrophilic Nano-Structured Coatings (SHNC) were discovered during pool boiling experiments using nanofluids with alumina nanoparticles. During nucleate boiling, the nanoparticles are deposited on the heater surface, forming a uniform oxide coating. These coatings have been demonstrated to greatly decrease the liquid contact angle observed on the surfaces, both by increased surface roughness and increased surface energy. An illustration of this roughness, within 1 μm thickness, can be seen in the 3-D optical microscope mapping of a SHNC surface, top right. These highly wetting structures can greatly enhance macro-level mass transfer effects, such as capillary action. The series of images on the left depict the wickability enhancement achieved by SHNC coating inside a 0.92 mm internal diameter aluminum tube. In the tube coated with SHNC, a 21 μl water droplet disappeared in 183 milliseconds, resulting in an average wicking speed along the pipe of 17 cm/sec. The bare aluminum tube does not wick at all, even as it is pushed into the droplet. The bottom right sequence shows the wettability enhancement responsible for this behavior; an 8 μl water droplet is dropped onto both a SHNC-coated and a bare aluminum surface from a height of 1 cm. The droplet on the SHNC-coated surface spreads instantaneously due to the high wettability of the SHNC, while the droplet on the bare aluminum remains aggregated as a hemisphere.
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Wetting & Wicking Effects of Superhydrophilic Nano-Structured Coatings
Adam Girard,
Adam Girard
Multi-Scale Heat Transfer Lab, Department of Mechanical Engineering,
adam.girard@utdallas.edu
University of Texas at Dallas
, Richardson, TX 75080
, USA
adam.girard@utdallas.edu
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Miguel Amaya,
Miguel Amaya
Department of Mechanical & Aerospace Engineering,
mamaya@uta.edu
The University of Texas at Arlington
, Arlington, TX 76019
, USA
mamaya@uta.edu
Search for other works by this author on:
Hyoseong Wi
Hyoseong Wi
Multi-Scale Heat Transfer Lab, Department of Mechanical Engineering,
hyoseong.wi@hyundai.com
University of Texas at Dallas
, Richardson, TX 75080
, USA
hyoseong.wi@hyundai.com
Search for other works by this author on:
Adam Girard
Multi-Scale Heat Transfer Lab, Department of Mechanical Engineering,
adam.girard@utdallas.edu
University of Texas at Dallas
, Richardson, TX 75080
, USA
adam.girard@utdallas.edu
Miguel Amaya
Department of Mechanical & Aerospace Engineering,
mamaya@uta.edu
The University of Texas at Arlington
, Arlington, TX 76019
, USA
mamaya@uta.edu
Hyoseong Wi
Multi-Scale Heat Transfer Lab, Department of Mechanical Engineering,
hyoseong.wi@hyundai.com
University of Texas at Dallas
, Richardson, TX 75080
, USA
hyoseong.wi@hyundai.com
Corresponding author.
J. Heat Transfer. Aug 2015, 137(8): 080908
Published Online: August 1, 2015
Article history
Received:
March 31, 2015
Revised:
April 2, 2015
Online:
June 1, 2015
Citation
Girard, A., Amaya, M., and Wi, H. (August 1, 2015). "Wetting & Wicking Effects of Superhydrophilic Nano-Structured Coatings." ASME. J. Heat Transfer. August 2015; 137(8): 080908. https://doi.org/10.1115/1.4030472
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