Present paper reports and discusses experimental results related to thermal and flow characteristics of asymmetrical designed flat plate closed loop pulsating heat pipe charged with miscible and immiscible binary fluids. Extensive experimental range is provided for a comprehensive analysis; which covers different binary mixing ratios (H:P, M:H and P:M = 1:1, 1:4 and 4:1) and inclination angles (0° and 90°). The filling ratio is kept constant as 50 %. H, P and M represent hexane, pentane and methanol, respectively. Results of pure fluids are also compared to binary ones, and all the processes are qualitatively analyzed via high speed visualization. It is concluded that methanol is the best choice among pure fluids; however, results completely changed when two fluids are mixed. Strongly depending on mixing ratio, immiscible binary mixtures show significantly better thermal performance compared to both the miscible binary one (H:P) and pure fluids. In this regard, optimum thermal characteristics are obtained with immiscible mixture of P:M = 1:1. On the other hand, increasing volume fraction of methanol in pentane-methanol mixture adversely affects thermal characteristics; and even, the poorest thermal performance is presented by the mixture of P:M = 1:4. Bubble dynamics and relevant flow patterns play critical role on heat transport phenomenon.

本论文报道并讨论了与非对称设计的平板式闭环脉动热管的热和流动特性相关的实验结果，该热管充斥有可混溶和不可混溶的二元流体。提供了广泛的实验范围，可以进行全面分析；它涵盖了不同的二元混合比（H：P，M：H和P：M = 1：1、1：4和4：1）和倾斜角度（0°和90°）。填充率保持恒定为50％。H，P和M分别代表己烷，戊烷和甲醇。还可以将纯流体的结果与二元流体的结果进行比较，并通过高速可视化对所有过程进行定性分析。结论是，甲醇是纯流体中的最佳选择。但是，当混合两种流体时，结果将完全改变。在很大程度上取决于混合比例，与可混溶的二元混合物（H：P）和纯流体相比，不可混溶的二元混合物表现出明显更好的热性能。在这方面，使用P：M = 1：1的不混溶混合物可获得最佳的热特性。另一方面，戊烷-甲醇混合物中甲醇体积分数的增加会对热特性产生不利影响。甚至P：M = 1：4的混合物也表现出最差的热性能。气泡动力学和相关的流动模式对传热现象起着至关重要的作用。戊烷-甲醇混合物中甲醇体积分数的增加会对热特性产生不利影响；甚至P：M = 1：4的混合物也表现出最差的热性能。气泡动力学和相关的流动模式对传热现象起着至关重要的作用。戊烷-甲醇混合物中甲醇体积分数的增加会对热特性产生不利影响；甚至P：M = 1：4的混合物也表现出最差的热性能。气泡动力学和相关的流动模式对传热现象起着至关重要的作用。