小通道套管换热器内流体流动与传热性能研究

发布时间：2018-06-06 00:03

本文选题：小通道 + 套管换热器　；参考：《东南大学》2015年硕士论文

【摘要】：套管换热器作为一种传热性能优良的换热设备,在化工、能源、制冷等领域具有广泛应用,再加上换热器材料价格的上涨,使得紧凑高效的换热器的开发和研究成为当下热点。因此,本文提出一种4mm小通道套管换热器,采用数值模拟和试验研究相结合的方法对该换热器内流体流动和传热性能进行了分析,并对小通道的分布进行研究,再将其与现有同轴套管换热器进行试验对比,具体研究内容包括：以现有的同轴式套管换热器性能为指标,外管径为20mm前提下,分别对小通道管径为4mm、5mm的换热器进行数值模拟研究,并根据数值模拟的结果详细分析换热器采用小通道的换热管后其内部流体流动和传热特性的变化。数值模拟结果表明：换热器的小通道管径由5mm减小到4mmm后,虽然换热管增加了3.66%的铜材,且压力损失也随之增加,但换热器的换热面积增加了6.63%,同时换热管内的换热系数和换热量也得到了增加,可以提高换热器的换热性能。换热器采用4mm管径的小通道后,本文研究了小通道不同的分布方式对换热器性能的影响。分别研究小通道的间距S为5mm、5.5mm、6mm、6.5mm、7mm时同一个截面上的温度分布,还有其换热系数和压力损失,得出最佳的小通道分布方式间距为6.5mmm,在该间距下,换热器的换热性能最好。同时设计搭建了4mm小通道套管换热器试验平台,以水为换热介质,对换热器内流体流动和换热性能进行研究,记录换热器在不同工况下换热量和管内阻力损失,将结果和数值模拟结果对比,验证数值模拟分析的正确可信。最后将小通道套管换热器与同轴套管换热器进行试验对比,分析对比小通道套管换热器与同轴套管换热器的换热性能。验证了小通道套管换热器的研究和应用是有意义的,且为以后的深入研究提供了方向。
[Abstract]:As a kind of heat transfer equipment with excellent heat transfer performance, casing heat exchanger has been widely used in chemical, energy, refrigeration and other fields. In addition, the development and research of compact and efficient heat exchangers have become a hot spot due to the rising price of heat exchanger materials. In this paper, a 4mm small channel casing heat exchanger is proposed. The fluid flow and heat transfer characteristics in the heat exchanger are analyzed by numerical simulation and experimental study, and the distribution of the small channel is studied. The experimental results are compared with the existing coaxial casing heat exchangers. The specific research contents are as follows: taking the existing coaxial casing heat exchangers as the index and the outer pipe diameter being 20mm, The heat exchangers with a diameter of 4 mm or 5 mm in diameter were numerically simulated, and the fluid flow and heat transfer characteristics of heat exchangers with small channels were analyzed in detail according to the results of numerical simulation. The numerical simulation results show that when the diameter of the heat exchanger is reduced from 5mm to 4mmm, the heat transfer pipe increases by 3.66% of copper, and the pressure loss also increases. However, the heat transfer area of the heat exchanger is increased by 6.63 and the heat transfer coefficient and heat transfer in the heat exchanger tube are also increased, which can improve the heat transfer performance of the heat exchanger. In this paper, the influence of the different distribution of the small channel on the performance of the heat exchanger is studied after adopting the small channel of 4mm tube diameter. The temperature distribution, heat transfer coefficient and pressure loss of the same section are studied when the distance S of the small channel S is 5mm / 5.5mm / 6mm / 6mm / 7mm, and the optimum distribution mode of the small channel is 6.5mm / m. The heat exchanger has the best heat transfer performance under this distance. At the same time, the 4mm small channel casing heat exchanger test platform is designed and built. The fluid flow and heat transfer performance in the heat exchanger are studied with water as the heat exchanger medium, and the heat transfer and resistance loss in the tube are recorded under different operating conditions. The results are compared with the numerical simulation results to verify the correctness and reliability of the numerical simulation analysis. Finally, the small channel casing heat exchanger and the coaxial sleeve tube heat exchanger are tested and compared, and the heat transfer performance of the small passage casing heat exchanger and the coaxial sleeve tube heat exchanger is analyzed and compared. It is proved that the research and application of small channel casing heat exchanger is meaningful, and it provides a direction for further research.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU83

【相似文献】