The Perspective Of The Dissolved Gas Amount And The Amount Of Crystallization Center To Study The Mpemba Effect

Water freezing is a very common natural phenomenon. It has so many strange places and people could not fully understand it, including Mpemba Effect, which involves not only physical properties, but also the crystallization of microorganisms center, a genuine "multivariate problems". In order to simulate the effect, the first question to be solved was whether the same liquid had same properties. For any liquid; what the properties of the liquid existed at the lowest temperature? What was the highest temperature? In order to solve these problems, a lot of experiments and literature had been done by using a correct theoretical basis and scientific method. Because in 1.01 x 105 Pa, gas containing in water would decrease with the increase of temperature. Based on this phenomenon, the phenomenon of the dissolved gas and bubbles influencing the icing process was observed. In recent years, due to the study of the form of existing dissolved gas found in water and some bubble, meanwhile, using the frozen-vacuum–thawing method dissolved gases and nanobubbles could be removed and the nanobubbles were all dispeared. The method can gain by inflatable bubble volume containing gas quantity and pretty high solution. After our systematical studies, some interesting results were obtained as follows:(1) This work mainly studies Mpemba effect, through the help of Brewster Principle and Light photocell born volts effect. Combining the polarization of light with current phenomenon the two experimental method. This principle high sensitivity, Methods accuracy is strong. Taking tap water, distilled water, pure water and boiled them and cooled to the temperature needed for the experiments. The results showed that :1) 90 ml water at about 55°C was taken into a -18°C refrigerator and the Brewster detector was employed to monitor the moment that ice was formed at the air-water interface. Then other types of water with different temperature, 20, 30…and 90 for example, were also tested using the method. 2) Experimental results show that: the amount of dissolved oxygen reduced with the increase of temperature.(2) From the angle of dissolved gas and air bubbles, this work to explained the Mpemba effect that the amount of dissolved gas and nanobubbles could affect the freezing time of tapping water, distilled water and pure water. Experimental results show that: the degassed water with very low concentration of dissolved gas and non nanobubbles, the freezing process was much faster. By adding method to tapping water, distilled water and pure water treatment, Preparation containing gas and obtained the inflatable bubble large amounts of water. Experimental results show that: After filling of the method can gain high gas quantity in water, the more gas and bubble containing in water, the slower the freezing rate. Still can draw: As tapping water, distilled water and pure water in the reduction of amount, crystallization center in lower freezing rate. Thus it was concluded that dissolved gas and crystal centres well explained the Mpemba effect.