### Abstract

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 (R_{c}) and geometrical characteristics of channels shows that cavitation does not occur in channels of uniform cross section (UCS), since 2R_{c} 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.

Original language | English |
---|---|

Article number | 105706 |

Journal | Nanotechnology |

Volume | 21 |

Issue number | 10 |

DOIs | |

Publication status | Published - 2010 |

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### All Science Journal Classification (ASJC) codes

- Bioengineering
- Chemistry(all)
- Electrical and Electronic Engineering
- Mechanical Engineering
- Mechanics of Materials
- Materials Science(all)

### Cite this

*Nanotechnology*,

*21*(10), [105706]. https://doi.org/10.1088/0957-4484/21/10/105706

**Negative capillary-pressure-induced cavitation probability in nanochannels.** / Zhang, Ruijing; Ikoma, Yoshifumi; Motooka, Teruaki.

Research output: Contribution to journal › Article

*Nanotechnology*, vol. 21, no. 10, 105706. https://doi.org/10.1088/0957-4484/21/10/105706

}

TY - JOUR

T1 - Negative capillary-pressure-induced cavitation probability in nanochannels

AU - Zhang, Ruijing

AU - Ikoma, Yoshifumi

AU - Motooka, Teruaki

PY - 2010

Y1 - 2010

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=77149152466&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77149152466&partnerID=8YFLogxK

U2 - 10.1088/0957-4484/21/10/105706

DO - 10.1088/0957-4484/21/10/105706

M3 - Article

VL - 21

JO - Nanotechnology

JF - Nanotechnology

SN - 0957-4484

IS - 10

M1 - 105706

ER -