一种新型脉动热管及其传热性能研究

为提高脉动热管的传热性能，本文提出了一种将文丘里管段与脉动热管相结合新型脉动热管，分别将文丘里管段布置在蒸发段、冷凝段、绝热段，利用文丘里效应促进脉动热管中工质的循环，并运用Fluent数值模拟中的VOF模型，从压差、温度等因素，研究了新型闭环脉动热管（CLPHP）的传热性能。结果表明：在相同的热流密度下，文丘里脉动热管的启动时间均比普通脉动热管启动时间短，其中3号(文丘里管段位于蒸发段)脉动热管启动时间最短；在小输入热流密度下，由于文丘里脉动热管能维持较长时间的小幅振荡，使其热阻均小于普通脉动热管，在32238 W/m2时，3号脉动热管换热性能最佳。在输入热流密度大于32238 W/m2以后，文丘里脉动热管的热阻均大于普通脉动热管热阻。新型脉动热管的传热性能的研究为小输入热流密度脉动热管的优化设计提供了新思路，为工程应用提供了设计依据。

Study on a new pulsating heat pipe and its heat transfer performance

In order to improve the heat transfer performance of pulsating heat pipe, a new pulsating heat pipe combining venturi section and pulsating heat pipe is proposed in this paper. The venturi section was arranged in evaporation section, condensation section and adiabatic section respectively. The venturi effect was used to promote the circulation of working medium in pulsating heat pipe, and the VOF model in fluent numerical simulation was used to study the heat transfer performance of the new closed-loop pulsating heat pipe (CLPHP) from the factors of pressure difference, temperature and so on. The results show that under the same heat flux, the start-up time of venturi pulsating heat pipe is shorter than that of ordinary pulsating heat pipe, and the start-up time of No. 3 pulsating heat pipe (venturi section is located in evaporation section) is the shortest; Under small input heat flux, the thermal resistance of venturi pulsating heat pipe is less than that of ordinary pulsating heat pipe because it can maintain small amplitude oscillation for a long time. At 32 238 W/m2, the heat exchange performance of No. 3 pulsating heat pipe is the best. When the input heat flux is greater than 32 238 W/m2, the thermal resistance of venturi pulsating heat pipe is greater than that of ordinary pulsating heat pipe. The research on the heat transfer performance of the new pulsating heat pipe provides a new idea for the optimal design of pulsating heat pipe with small input heat flux, and provides a design basis for engineering application.