In this paper,we take the mid-temperature gravity heat pipe exchanger as the research object,simulate the fluid flow field,temperature field and the working state of heat pipe in the heat exchanger by Fluent software....In this paper,we take the mid-temperature gravity heat pipe exchanger as the research object,simulate the fluid flow field,temperature field and the working state of heat pipe in the heat exchanger by Fluent software.The effects of different operating parameters and fin parameters on the heat transfer performance of heat exchangers are studied.The results show that the heat transfer performance of the mid-temperature gravity heat pipe exchanger is the best when the fin spacing is between 5 mm and 6 mm,the height of the heat pipe is between 12 mm and 13 mm,and the inlet velocity of the fluid is between 2.5 m/s to 3 m/s.展开更多
重力热管以其极佳的传热能力广泛应用于工程领域,而对于单根热管传热性能的提升则能够更好地提高换热设备的效率。本文通过数值模拟方法,分析了重力热管参数变化对其传热特性的影响。结果表明:VOF(Volume of Fluid)模型能够捕捉重力热...重力热管以其极佳的传热能力广泛应用于工程领域,而对于单根热管传热性能的提升则能够更好地提高换热设备的效率。本文通过数值模拟方法,分析了重力热管参数变化对其传热特性的影响。结果表明:VOF(Volume of Fluid)模型能够捕捉重力热管内部的蒸发冷凝现象;热管热阻随着充液率或加热功率的增大而减小;在一定范围内,热管热阻随热管内径增大而减小,随冷凝段长度增大而先增大后减小,但冷凝段长度过小会导致气液循环效果变差,因此,在实际设计中应考虑热管传热极限及安全长度比,保证热管的安全运行。展开更多
文摘In this paper,we take the mid-temperature gravity heat pipe exchanger as the research object,simulate the fluid flow field,temperature field and the working state of heat pipe in the heat exchanger by Fluent software.The effects of different operating parameters and fin parameters on the heat transfer performance of heat exchangers are studied.The results show that the heat transfer performance of the mid-temperature gravity heat pipe exchanger is the best when the fin spacing is between 5 mm and 6 mm,the height of the heat pipe is between 12 mm and 13 mm,and the inlet velocity of the fluid is between 2.5 m/s to 3 m/s.
文摘重力热管以其极佳的传热能力广泛应用于工程领域,而对于单根热管传热性能的提升则能够更好地提高换热设备的效率。本文通过数值模拟方法,分析了重力热管参数变化对其传热特性的影响。结果表明:VOF(Volume of Fluid)模型能够捕捉重力热管内部的蒸发冷凝现象;热管热阻随着充液率或加热功率的增大而减小;在一定范围内,热管热阻随热管内径增大而减小,随冷凝段长度增大而先增大后减小,但冷凝段长度过小会导致气液循环效果变差,因此,在实际设计中应考虑热管传热极限及安全长度比,保证热管的安全运行。
