Temperature effect on bubble characteristics formed by flotation frother vapor
Some disadvantages of the traditional frother addition mode,such as non-selective adsorption,can be solved through a novel method that adsorbing frother vapor at the bubble surface from bubble inside.In this study,the thermal/kinetic bubble characteristics with vaporized Sec-octyl alcohol,methyl isobutyl carbinol(MIBC),and air at different temperatures were analyzed using a high-speed motion capture system.The results show that with the increase of vaporization temperature,the bubble aspect ratio gradually increases while the bubble volume decreases.The bubble volume follows the order of MIBC<sec-octyl alcohol<air.The decrease in bubble surface tension and additional pressure with increasing vaporization temperature is the main factor causing the changes in bubble aspect ratio and volume.As the vaporization temperature increases,the terminal velocity of upward bubble decreases and the time of reaching the stable terminal velocity is shortened.The bubble kinetic energy decreases with increasing temperature.At the same vaporization temperature,the bubble kinetic energy of sec-octyl alcohol is greater than that of MIBC.The sum of surface energy,kinetic energy,and potential energy of the bubble decreases with increasing the vaporization temperature.
flotation bubblesfrothertemperature effectsurface energykinetic energy of bubbles
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