Summary
Frost and freezing condensation phenomenon is widespread in air conditioning and refrigeration field, resulting in a lot of wasted energy, the traditional method of inhibiting condensation and freezing frost does not solve the problem fundamentally, consumes a lot of energy. Superhydrophobic surface has excellent resistance to frost and anti-condensation anti-icing properties, but the current study, there are still many deficiencies, this paper by observing the changes superhydrophobic surfaces frost condensation droplets freezing process, combined classical nucleation theory to analyze its mechanism and thus its depth.
Hydrochloric acid on aluminum surfaces by chemical etching to prepare superhydrophobic surface aluminum body combined with spraying superhydrophobic coating methods, equipment and processes required for this method is simple, is expected to promote large-scale applications. Preparation of aluminum superhydrophobic surface morphology of the analysis carried out, under the microscope, superhydrophobic surface showing "Vals" micro-nano scale-like structure, it is because the presence of these micro and nano structures such that the surface has superhydrophobic properties, the determination of the surface contact angle of 152 °; the use of high-speed video camera observing the dynamic process of droplet dynamics superhydrophobic surface, the results showed that the superhydrophobic surface preparation of this chapter in the normal and lateral infiltration has a good non-stick sex.
By microscopic observation superhydrophobic surface condensation initial droplet condensation, coagulation process, the results show that, within a certain range, super-hydrophobic surface condensation droplet diameters as the ambient temperature increases, the relative humidity increases, the temperature of the substrate decreases and increases; Comparative superhydrophobic surfaces with conventional surface under the same conditions of the condensation image found that the average surface of the droplets and the rapid formation of a layer of condensate nucleation "water film", while the super-hydrophobic surface into a droplet nucleation and coagulation larger diameter droplets, more sparsely distributed in superhydrophobic surfaces; condensation quality statistics on experiments under different conditions at different times superhydrophobic surface, the results showed that superhydrophobic surfaces better than ordinary anti-condensation properties, and fitting a superhydrophobic surface condensation quality factors associated with their type:
Finally, microscopic observation of the early frost, changes in quality of frost frost layer growth process, using the classical nucleation theory for the mechanism of superhydrophobic surfaces to explain the anti-frost.
Different dripping height were selected for stability superhydrophobic surface impact test, the results herein show that the superhydrophobic surface of the droplets produced at the high-speed impact can still maintain an excellent non-stick superhydrophobic properties; superhydrophobic surface on Static droplet surface than ordinary home has excellent ability to delay the ice, but with decreasing substrate temperature, the ability to delay the icing decreased; dynamic low droplet impact superhydrophobic surface experiments showed that when the temperature is higher than -25 â low temperature drops quickly ricochet off the superhydrophobic surface without the risk of freezing.
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