管内置不同丝截面弹簧强化传热研究

发布时间：2018-03-10 00:05

本文选题：强化传热　切入点：弹簧　出处：《武汉工程大学》2015年硕士论文　论文类型：学位论文

【摘要】：管内内置螺旋弹簧作为一种高效的强化传热技术,能够有效的解决换热器的传热低效率问题。本文对管内置不同丝截面弹簧强化传热效率研究,分别采取实验研究对比和CFD数值模拟实验对比相结合的方法,系统的分析了各种不同弹簧结构参数对强化传热性能的影响。本文对管内内置弹簧条件下,管内流体的平均努塞尔数率Nu',平均摩擦阻力系数率'f以及强化传热效率η三个方面进行分析。运用对比实验研究方法,搭建了管内置螺旋弹簧换热管强化换热实验平台,分别对管内置不同丝截面弹簧,不同丝径大小弹簧以及不同节距大小弹簧换热管与光管换热管内流体流动传热特性进行比对分析研究,着重分析管内置不同丝截面弹簧对传热效率的影响。实验结果表明,管内置方形丝截面的流体的平均努塞尔数率Nu'为2.4,平均摩擦阻力系数率'f为8,管内置圆形丝截面的流体的平均努塞尔数率Nu'为2.2,平均摩擦阻力系数率'f为7.5,方形丝截面弹簧的强化传热效率η为1.18,圆形丝截面弹簧的强化传热效率η为1.1。本文使用CFD数值模拟软件,建立可靠性较好的数值模拟模型,对不同模型进行了网格划分,网格独立性验证,保证了模拟实验的可靠性。着重分析比对管内置不同丝截面弹簧对强化传热效率的影响,且运用了过增元院士的场协同理论进行理论验证,验证了模拟实验结果。研究结果表明,数值模拟方法能够较为直观的呈现流场特性分布,并且在同等条件下,管内置方形丝截面弹簧和三角形丝截面弹簧强化传热效率η均相较于圆形丝截面弹簧强化传热效率η高于11%-20%。
[Abstract]:As an efficient heat transfer enhancement technique, the coil spring in the tube can effectively solve the heat transfer inefficiency of heat exchanger. In this paper, the heat transfer efficiency of the tube with different wire cross-section spring is studied. The effects of various spring structure parameters on the heat transfer enhancement performance are systematically analyzed by means of experimental study and CFD numerical simulation. In this paper, the effect of different spring parameters on heat transfer enhancement is studied. The average Nussel number rate of the fluid in the tube, the average friction resistance coefficient f and the enhanced heat transfer efficiency 畏 are analyzed. The experimental platform for the enhancement of heat transfer in the tube with helical spring heat transfer tube is built by using the comparative experimental research method. The characteristics of fluid flow heat transfer in tube with different wire cross-section spring, different wire diameter spring and different pitch spring are compared and analyzed respectively. The effect of spring with different wire section on heat transfer efficiency is analyzed. The experimental results show that, The average Nussel number rate of fluid with square filament cross section is 2.4, the average friction resistance coefficient is 8, the average Nusseler number rate of fluid with circular filament section is 2.2, and the average friction resistance coefficient is 7.5, square. The enhanced heat transfer efficiency 畏 of wire section spring is 1.18, and that of circular wire section spring is 1.1. The CFD numerical simulation software is used in this paper. The numerical simulation model with good reliability is established, and the different models are meshed, the mesh independence is verified, and the reliability of the simulation experiment is ensured. The effect of the different wire section spring inside the tube on the heat transfer enhancement efficiency is analyzed emphatically. The simulation results show that the numerical simulation method can show the characteristic distribution of the flow field directly, and under the same conditions, the numerical simulation method can be used to verify the flow field characteristics of the supernumerary academicians, and the simulation results show that the numerical simulation method can show the characteristic distribution of the flow field directly and under the same conditions. The enhanced heat transfer efficiency 畏 of square and triangular wire section spring is higher than that of circular wire section spring, which is higher than that of circular wire section spring.
【学位授予单位】：武汉工程大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ021.3

【相似文献】