【摘要】 建立了恒热流传热实验台,对新型弹性管束管外传热特性进行实验研究,得到了不同Re数下弹性管束的整体及局部换热性能。设计了电机驱动流体脉动装置,得到了不同脉动参数下弹性管束的传热及阻力特性,并拟合得到了各工况下的实验准则关联式。实验结果表明,在所讨论的参数范围内弹性管束的管外平均表面传热系数可以达到固定管束的3倍以上,强化传热效果显著,且中间两根弹性管的表面传热系数要明显高于边缘两管。通过对比不同实验工况可以得出当流体脉动频率为15 Hz时弹性管束的PEC值最高,综合换热性能最好。更多还原

【Abstract】 Experimental research was performed on the heat transfer characteristics outside a new-type of elastic-tube-bundle under constant heat flux.Both overall and local heat transfer performances of the elastic-tube-bundle were obtained under different Re numbers.Then,based on the self-designed motor-driven fluid-pulsation-generating device,the heat transfer and flow resistance characteristics of the elastic-tube-bundle were studied under different pulsation conditions.The results are fitted to achievc the experimental correlations.It is concluded that the average surface heat transfer coefficient outside the elastic-tube-bundle is more than 3 times larger than that outside the fixed-tube-bundle within the parameter range considered.The two elastic tubes in the middle perform much better than the two outer tubes.At pulsation frequency of 15Hz,the elastic-tube-bundle performs the best with the highest PEC(Performance Evaluation Criteria) value.更多还原