The Analysis Of The Nucleation Of The Fluid In The Dynamic Ice Slurry Making System

Ice-making cold thermal energy storage systems have been in the spotlight because they act on flatting the electric power load curve in the daytime in summer, which has a peak due to the use of air-conditioning. Water is widely used as the phase change material for thermal storage because of such advantages as high latent heat of melting, stability, low cost and so on. However, there are a few disadvantages with the use of water. One of the most serious problems is the supercooling phenomenon that occurs in the process of solidifying water of the cold storage.The pure water had been used as the basic fluid. Some factors, such as the roughness of the vessel, the cooling rate, the material of the vessel had been studied. Besides, the nucleation mechanism of the vessel surface based on the relationship between the characteristic of the surface and the critical nuclation radius had been obtained.According to adding nanoparticles to pure water, the decreasing of supercooling degree had been observed. The dispersants and ultrasonic vibration would affect the stable and eveness of the nanoparticle, giving a further affection on the nucleation. The heat transfer enhancement of the nanofluids had also been studied.Based on the study above, the charactristics of the nanoparticles aiming at decrease the supercooling degree of the water had been acquired, which lie on the wettability and the crystal structure between the basic fluid and the addition.This paper had also studied the temperature boundary layer of the fluid near the inner suface of the vessel, including the heat flux of the fluid. Some methods had been studied to avoid the adhesion in the surface type heat exchanger. The results in this paper will make a good foundation for rebuilding the dynamic ice making system.