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Experimental Study of Phase-Changeable Water/Polyalphaolefin Nanoemulsion Fluids

[+] Author Affiliations
Jiajun Xu

University of the District of Columbia, Washington, DC

B. Hammouda

National Institute of Standards and Technology (NIST), Gaithersburg, MD

Fangyu Cao, Bao Yang

University of Maryland, College Park, MD

Paper No. IMECE2014-36533, pp. V08BT10A086; 8 pages
doi:10.1115/IMECE2014-36533
From:
  • ASME 2014 International Mechanical Engineering Congress and Exposition
  • Volume 8B: Heat Transfer and Thermal Engineering
  • Montreal, Quebec, Canada, November 14–20, 2014
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4956-9
  • Copyright © 2014 by ASME

abstract

In this work, thermal properties especially phase change heat transfer properties of one new type of nanostructured heat transfer fluid: Water/Polyalphaolefin (PAO) nanoemulsion fluid are investigated. Water is added into PAO fluid to form nanoemulsion fluids in which dispersed water nanodroplets are formed by self-assembly.

The liquid-to-vapor phase change results, expressed in terms of surface heat flux and heater temperature, have shown that the presence of water nanodroplets has a drastic impact on the liquid-to-vapor phase change behavior of the nanoemulsion fluid studied: the water nanodroplet formed inside can enhance its heat transfer coefficient by over 300% after the incipience of its phase change. In addition to that, the vaporization of the water nanodroplet inside is found to be different depending on the concentration of water inside, which happens to coincide with the structure change with different water concentrations as observed in SANS measurement. On the other hand, the effective specific heat is also found to increase with higher water concentration until reaching a maximum value which also happens to coincide with the structure transition from spherical to cylinder shape with the increasing of water concentrations as observed from SANS measurement. More study is still needed to understand the mechanism behind these phenomena.

Copyright © 2014 by ASME
Topics: Fluids , Water

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