Negative capillary-pressure-induced cavitation probability in nanochannels

Ruijing Zhang, Yoshifumi Ikoma, Teruaki Motooka

    研究成果: ジャーナルへの寄稿学術誌査読

    20 被引用数 (Scopus)


    The capillarity-induced negative pressure of water flow has been investigated in nanochannels of a rectangular cross section by using computational fluid dynamics (CFD) simulation. As a consequent effect of negative pressure, the cavitation probability has been analyzed numerically. The numerical relation between the critical radius of cavitation (Rc) and geometrical characteristics of channels shows that cavitation does not occur in channels of uniform cross section (UCS), since 2Rc is larger than the smallest dimension of the channel. However, it may occur in channels of non-uniform cross section (NUCS), except for planar or high aspect ratio channels. The inequality in height and width is favorable for the absence of cavitation. The findings can also be applied to channels of elliptical or circular cross section. The results show the influence of geometrical characteristics of channels on the cavitation probability, which is important to engineer the channel geometrical structure in order to avoid undesirable filling problem 'cavitation' during the flow process.

    出版ステータス出版済み - 2010

    !!!All Science Journal Classification (ASJC) codes

    • 化学一般
    • 材料力学
    • 機械工学
    • バイオエンジニアリング
    • 電子工学および電気工学
    • 材料科学一般


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