Experimental Study of Vapor Supercavitation Suppression of Capillary Outlet Jet Noise

The degree of bubble bursting at the inlet of an evaporator is the key factor to determine the size of the injection noise at the capillary outlet. In this study, by using the theory of cavitation dynamics, the transition tube between the capillary and evaporator is improved to suppress the bubble bursting at the entrance of the evaporator, so as to reduce the jet noise at the outlet of the capillary. The influence of aeration structure on noise reduction of a refrigerator (Haier BCD-520) was studied by numerical simulation, and experiments were carried out. The results show that the admixture structure significantly inhibits the bubble bursting and reduces the injection noise by 1.5 dB(A).

Liquid Deposition at Micro and Nanoscale

Micro/Nanolithography is a creation of micro/nano features on the substrate. This paper proposes a new capillary-based lithography method that is non-invasive to substrate. The application of the pressure from one side of capillary causes the liquid meniscus to form at the capillary outlet. Touching the substrate with the meniscus only causes the liquid deposition on the substrate. The size of deposited liquid droplet is about 10% of inner diameter of the capillary. Glycerol was chosen as a trial liquid of deposition, because the rate of evaporation for glycerol is low in comparison with other liquids. The deposition of glycerol was done in micro-scale. Comparison of theoretical results with experimental data is shown and discussed.