Abstract
A colloidal damper (CD) can dissipate a significant amount of vibrations and impact energy owing to the interface power that is generated when it is used. It is of great practical significance to study the influence of the nanochannel structure of hydrophobic silica gel in the CD damping medium on the running speed of the CD. The fractal theory was applied to observe the characteristics of the micropore structure of the hydrophobic silica gel by scanning electron microscopy (SEM), the primary particles were selected to carry out fractal analysis, and the two-dimensional fractal dimension of the pore area and the tortuous fractal dimension of the hydrophobic silica gel pore structure were calculated. The fractal percolation model of water in hydrophobic silica nanochannels based on the slip theory could thus be obtained. This model revealed the relationship between the micropore structure parameters of the silica gel and the running speed of the CD. The CD running speed increases with the addition of grafted molecules and the reduction in pore size of the silica gel particles. Continuous loading velocity testing of the CD loaded with hydrophobic silica gels with different pore structures was conducted. By comparing the experimental results with the calculation results of the fractal percolation model, it was determined that the fractal percolation model can better characterize the change trend of the CD running velocity for the first loading, but the fractal dimension was changed from the second loading, caused by the small amount of water retained in the nanochannel, leading to the failure of fractal characterization.
Highlights
Vibration and noise reduction are a technical issue of general concern in the field of engineering
In terms of the energy dissipation mechanism, when the liquid enters the nanochannels of the porous media under external pressure, interfacial power is generated at the “gas–liquid–solid” boundary to consume mechanical energy, and the energy conversion of porous medium particles is more obvious after surface modification
The analysis of gas/liquid seepage in hydrophobic silica nanochannels was performed based on the following assumptions: the interface resistance of the channel was ignored, the two phases of flow in the channel were incompatible with each other, the viscosities of the two-phase fluid did not affect each other, and the temperature did not change during the process of water infiltration [18]
Summary
Vibration and noise reduction are a technical issue of general concern in the field of engineering. The average apertures measured by the adsorption method passing through N2 were 10.03 nm and 30.17 nm, respectively, so it can be inferred that the size of the silicone primary particles is approximately 2–3 times the average aperture of the silicone; this is roughly in line with the data measured by Yang Junsheng et al [16] It was found through the comparison experiments that it was the primary particles, rather than the secondary part4icolfe1s3, that affected the percolation and energy dissipation characteristics of the colloidal nanochannels [9]. The value of Dt ranged from 1.07 to 1.18, showing the opposite trend to Df, decreasing with an increase in the number of grafted molecules and increasing with increasing pore size
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