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在环形正负电子对撞机(CEPC)大型探测器超导磁体拟采用低温虹吸冷却系统的预研背景下,搭建了氦低温虹吸冷却回路实验平台,进行了气-液两相自然循环传热传质特性实验研究。实验测量了不同充装量下,压力、温度随热流量的变化规律,计算了实验段的表面传热系数。研究表明,充装率对热虹吸冷却循环具有重要影响,在40%55%合适的充装率下能够保证该系统的正常运行;另外实验段不同位置的表面传热系数不同,烧干先在上端发生,然后逐渐向下端发展。
Under the pre-research background of the low-temperature siphon cooling system of CEPC large-scale detector superconducting magnet, a helium cryogenic siphon cooling circuit experimental platform was set up and the natural gas-liquid two-phase circulation heat transfer Experimental Study on Mass Transfer Characteristics. The variation of pressure and temperature with the heat flux under different filling quantities was experimentally measured, and the surface heat transfer coefficient of the experimental section was calculated. The results show that the filling rate has an important influence on the thermosyphon cooling cycle, and can ensure the normal operation of the system under the suitable filling rate of 40% and 55%. In addition, the surface heat transfer coefficients at different positions are different, Occurs at the top, and then gradually develops to the bottom.