Abstract
The capillarity-induced negative pressure of water flow has been investigated innanochannels of a rectangular cross section by using computational fluid dynamics (CFD)simulation. As a consequent effect of negative pressure, the cavitation probability has beenanalyzed numerically. The numerical relation between the critical radius of cavitation (Rc) and geometrical characteristics of channels shows that cavitationdoes not occur in channels of uniform cross section (UCS), since2Rc is larger than the smallest dimension of the channel. However, it may occur in channels ofnon-uniform cross section (NUCS), except for planar or high aspect ratio channels. Theinequality in height and width is favorable for the absence of cavitation. The findingscan also be applied to channels of elliptical or circular cross section. The resultsshow the influence of geometrical characteristics of channels on the cavitationprobability, which is important to engineer the channel geometrical structure inorder to avoid undesirable filling problem ‘cavitation’ during the flow process.
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