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Phase change cooling technology has high cooling efficiency and represents a novel approach to achieving efficient heat dissipation for high-power and large-capacity electrical equipment. This paper comprehensively investigated the feasibility of C6F12O as a phase change coolant. Combining the phase-field method based on the Cahn-Hilliard equation with the theory of electrohydrodynamic, considering the coupling effect of electric-flow-thermal-phase fields, numerical simulation research was conducted on the phase transition evolution process of C6F12O medium under varying temperature and electric field conditions, and then the bubble motion characteristics in the existing cooling medium C6F14 was compared. The results show that compared with C6F14, without an electric field, the change in temperature has a more significant impact on the bubble motion characteristics in C6F12O. The rise in temperature increases its bubble statistical velocity by 75.75%. An appropriate uniform electric field promotes the bubble evolution in the medium. Under the same superheat degree (∆T=0.056), the higher dielectric constant of C6F12O makes the polarization effect caused by the electric field more obvious, and it can transition to film boiling at a lower field strength. Under the action of horizontal uniform electric field, for different electric Bond numbers (BoE), the statistical velocity of bubbles in C6F12O is generally lower than that in C6F14, while the bubble release period is shorter and the frequency is higher. Under the action of vertical uniform electric field, the bubble statistical velocity in C6F12O increases from 4.131 to 4.760, and the release period shortens from 3.889 s-1 to 2.059 s-1, and the bubble motion is more intense than that in C6F14.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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