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The amount of dissolved gas and the amount of crystallization center angle to study Mpemba effect

Author: WangJinPing
Tutor: DongYaMing
School: Shanghai Normal University
Course: Physical and chemical
Keywords: Dissolved gases Nanobubbles Depth degassing Brewster principle Silicon photovoltaic cells photovoltaic effect
CLC: O642
Type: Master's thesis
Year: 2011
Downloads: 54
Quote: 0
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Abstract

The freezing of water is a very common natural phenomenon, in fact, it has too many strange people far not fully understand it, in which the \It is not only related to physical reasons, but also to the as crystallization centers the action of microorganisms, is an out-and-out \In order to simulate the effect, we must first address four issues: whether the liquid of the same species; quality are equal; whether how much of any liquid, liquid quality; lowest temperature difference is how much? Highest temperature difference and how much? Order to solve this four questions, through a large number of experiments and literature, with the correct theoretical basis and scientific methods. 1.01 × 105 Pa or under, water containing the amount of the gas will decrease with increasing temperature. The advantage of this phenomenon we can change the water contained in the gas volume and the amount of bubbles to study the impact of the freezing rate. In recent years, due to the water gas exists in the form of research found that the presence of water and some bubbles. Related studies have found that the vacuum - by freeze - thaw depth degassing method, the dissolved gas can be removed from the solution and nano-bubbles. Containing a relatively high amount of the gas and the amount of bubbles in the solution can be obtained by the method of inflatable. This thesis is to verify the \verification the \The principles and methods of high sensitivity and accuracy. Adopted for drying the water, double distilled water, ultra pure water treatment, heated to boiling, and then cooled to the desired water temperature. A large number of experiments to verify the \The experimental results showed that: 1) When the amount of water given 90g, water drying effect found between about 55 ° C to 95 ° C, and double-distilled water and ultrapure water at about 60 ° C to 95 ° C meet this effect. Thus the \2) at three treated water, the dissolved oxygen content of the test. The measurement temperature range of 20 ° C -90 ° C once every 10 ° C measurement. The experimental results show that: the dissolved oxygen content reduced very significantly with increasing temperature. This laid the foundation for the following experiments. (2) This study was dissolved gas amount and the amount of crystallization center angle to explanation the Mpemba \(FPT) Depth degassing method for drying the water, double distilled water, ultrapure water treatment was prepared to obtain a depth deaerated water-containing gas and the amount of bubbles is almost zero. Experimental results show that: the depth degassing removal of gas bubbles contained in the water the less amount of gas bubbles, the faster the freezing rate. By a pneumatic method of drying the water, double distilled water, ultrapure water treatment was prepared to obtain a gas containing a high amount of bubbles of the pneumatic water. Experimental results show that: the inflatable means can be obtained with a high volume of water, the water-containing gas and the amount of bubbles, the more the slower freezing rate. Can be drawn: in order of decreasing drying water, double distilled water, ultrapure water crystal center to reduce the amount of freezing rate. Therefore, from dissolved gas amount and the amount of a crystalline center angle to explanation the Mpemba \

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