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应用Fluent软件基于焓-孔隙率法模拟和求解垂直升降水下监测平台的相变过程。采用体积比为9∶1的正十六烷和石墨复合相变材料,以提高相变材料的导热系数。对不同结构的相变换热器进行数值分析,研究不同结构和海水温度对相变过程的影响。结果表明:在相变材料体积和圆筒形相变换热器内径相同的前提下,较小外径的圆筒形相变换热器具有更好的相变性能;较低的海水温度非常有利于凝固过程的进行;由于液相自然对流换热的存在,相同情况下熔解速率远大于凝固速率。
Fluent software was used to simulate and solve the phase change process of underwater vertical monitoring platform based on enthalpy - porosity method. The volume ratio of 9: 1 n-hexadecane and graphite composite phase change material to improve the thermal conductivity of the phase change material. The phase change heat exchangers with different structures were numerically analyzed to study the influence of different structures and seawater temperature on the phase transformation process. The results show that cylindrical phase change heat exchanger with smaller outer diameter has better phase transition performance under the condition of the same volume of phase change material and the same inner diameter of cylindrical phase change heat exchanger. The lower seawater temperature is very favorable to the solidification process ; Due to the existence of natural liquid convection heat transfer, the melting rate is much higher than the solidification rate under the same conditions.