Pulsating Heat Pipes are ideal for compact cooling applications such as electronic cooling. In this experimental research, the thermal performance of Inner-Grooved Pulsating Heat Pipes (IGPHP) and Smooth Pulsating Heat Pipes (SPHP) compared using distilled water in different angles. The inclination angles of 0^o, 5 ^o, 15 ^o, 30 ^o, 50 ^o, 70 ^o, and 90 ^o, and the input heat range of 50-300 W were studied. The results show that the optimum filling ratio is 60% for IGPHP and SPHP. The study shows that in constant Input heat, the thermal resistance of IGPHP is lower than SPHP and the effective thermal conductivity of IGPHP is higher compared to SPHP. The average reduction of the thermal resistance of IGPHP compared to SPHP was found 21% across all angles and input heat powers; however, the average reduction was 49% for the angle of 5 ^o across all input heat powers. The dryout phenomenon for IGPHP took place at 0^o and the input heat of 100 W, while for SPHP, this occurred at 5^o and 250 W. The overall comparison shows that IGPHP is an even better alternative to SPHP in higher capacity applications.

脉动热管是紧凑冷却应用（例如电子冷却）的理想选择。在本实验研究中，使用不同角度的蒸馏水比较了内槽式脉动热管（IGPHP）和光滑式脉动热管（SPHP）的热性能。倾斜角度为^0o，^5o，^15o，^30o，^50o，^70o和^90o，研究了50-300 W的输入热量范围。结果表明，IGPHP和SPHP的最佳填充率为60％。研究表明，在恒定输入热量下，IGPHP的热阻低于SPHP，并且IGPHP的有效导热率高于SPHP。与SPHP相比，IGPHP的热阻平均降低了，在所有角度和输入热功率下均降低了21％。但是，在所有输入热功率中，相对于5 ^o的角度，平均减少量为49％。IGPHP的变干现象发生在0 ^o，输入热量为100 W，而SPHP的变干现象发生在5 ^o和250W。总体比较表明，在更高容量的应用中，IGPHP甚至可以替代SPHP。