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    Single-bubble dynamics in pool boiling of one-component fluids

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    PhysRevE.89.063002.pdf
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    Type
    Article
    Authors
    Xu, Xinpeng
    Qian, Tiezheng
    KAUST Department
    Physical Science and Engineering (PSE) Division
    Date
    2014-06-04
    Permanent link to this record
    http://hdl.handle.net/10754/552797
    
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    Abstract
    We numerically investigate the pool boiling of one-component fluids with a focus on the effects of surface wettability on the single-bubble dynamics. We employed the dynamic van der Waals theory [Phys. Rev. E 75, 036304 (2007)], a diffuse-interface model for liquid-vapor flows involving liquid-vapor transition in nonuniform temperature fields. We first perform simulations for bubbles on homogeneous surfaces. We find that an increase in either the contact angle or the surface superheating can enhance the bubble spreading over the heating surface and increase the bubble departure diameter as well and therefore facilitate the transition into film boiling. We then examine the dynamics of bubbles on patterned surfaces, which incorporate the advantages of both hydrophobic and hydrophilic surfaces. The central hydrophobic region increases the thermodynamic probability of bubble nucleation while the surrounding hydrophilic region hinders the continuous bubble spreading by pinning the contact line at the hydrophobic-hydrophilic intersection. This leads to a small bubble departure diameter and therefore prevents the transition from nucleate boiling into film boiling. With the bubble nucleation probability increased and the bubble departure facilitated, the efficiency of heat transfer on such patterned surfaces is highly enhanced, as observed experimentally [Int. J. Heat Mass Transfer 57, 733 (2013)]. In addition, the stick-slip motion of contact line on patterned surfaces is demonstrated in one-component fluids, with the effect weakened by surface superheating.
    Citation
    Single-bubble dynamics in pool boiling of one-component fluids 2014, 89 (6) Physical Review E
    Publisher
    American Physical Society (APS)
    Journal
    Physical Review E
    DOI
    10.1103/PhysRevE.89.063002
    PubMed ID
    25019874
    Additional Links
    http://link.aps.org/doi/10.1103/PhysRevE.89.063002
    ae974a485f413a2113503eed53cd6c53
    10.1103/PhysRevE.89.063002
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    Physical Science and Engineering (PSE) Division; Publications Acknowledging KAUST Support

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