平直开缝翅片和波纹翅片管换热器换热特性的数值模拟
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摘要
采用FLUENT数值模拟方法,研究了平直翅片、平直开缝翅片、正弦波纹翅片和均匀倾角波纹翅片4种形式的翅片管换热器的空气侧流动和传热特性。分析出2种不同的波纹形式以及翅片开缝对翅片管换热器换热特性的影响。改变进口风速,在不同雷诺数的工况下,得到4种换热器的换热量Q、努塞尔数Nu、压降ΔP以及阻力因子f等与进口风速u和雷诺数Re的关系。结果表明进口风速增大,雷诺数增加,可显著提高换热器换热量,然而同样带来更多的阻力损失。翅片开缝对传热能力有明显的提升作用,波纹翅片在提高换热效率的同时阻力损失增加较小。
Numerical simulation method was used by using FLUENT software to study the air side flow and heat transfer performance of four kinds of fin-and-tube heat exchangers, such as plain fin, plain slit fin, sine corrugated fin and uniform angle corrugated fin. The effects of corrugated fin type and slit on the heat transfer performance of heat exchangers were analyzed. Changing the inlet velocity, the relationships between heat exchanger Q, Nusselt number Nu, pressure drop ΔP, resistance factor f and Re were obtained. Results showed that as the increase of inlet velocity and Re, heat transfer was significantly improved, however, the energy loss was improved too. Among the four kinds of fin-and-tube heat exchanger, the slit fin had better effect on heat transfer, corrugated fin improved the thermal efficiency with relatively less increase of energy loss.
Numerical simulation method was used by using FLUENT software to study the air side flow and heat transfer performance of four kinds of fin-and-tube heat exchangers, such as plain fin, plain slit fin, sine corrugated fin and uniform angle corrugated fin. The effects of corrugated fin type and slit on the heat transfer performance of heat exchangers were analyzed. Changing the inlet velocity, the relationships between heat exchanger Q, Nusselt number Nu, pressure drop ΔP, resistance factor f and Re were obtained. Results showed that as the increase of inlet velocity and Re, heat transfer was significantly improved, however, the energy loss was improved too. Among the four kinds of fin-and-tube heat exchanger, the slit fin had better effect on heat transfer, corrugated fin improved the thermal efficiency with relatively less increase of energy loss.
引文
[1] 周俊杰,徐国权,张华俊. FLUENT工程技术与实例分析[M]. 北京:中国水利水电出版社,2010Zhou Junjie, Xu Guoquan, Zhang Huajun. FLUENT engineering and case analysis [M]. Beijing: China Water Power Press, 2010 (in Chinese)
[2] Lozza G, Merlo U. An experimental investigation of heat transfer and friction losses of interrupted and wavy fins for fin-and-tube heat exchangers[J]. International Journal of Refrigeration, 2001, 24(5): 409-416
[3] Naphon P. Effect of wavy plate geometry configurations on the temperature and flow distributions [J]. International Communications in Meat and Mass Transfer, 2009, 36(9): 942-946
[4] 秦萌, 尤学一. 波纹穿圆孔翅片管换热器换热特性的数值模拟[J]. 天津城建大学学报, 2015, (5): 363-368Qin Meng, You Xueyi. Numerical simulation of corrugated wear round hole fin-and-tube heat exchanger [J]. Journal of Tianjin Urban Construction University, 2015, (5): 363-368 (in Chinese)
[5] 韩占忠,王敬,兰小平. FLUENT流体工程仿真计算实例与应用[M]. 北京:北京理工大学出版社, 2004
[6] 李慧珍,屈治国,程永攀,等.开缝翅片流动和传热性能的实验研究及数值模拟[J]. 西安交通大学学报,2005, 39(3): 229-232Li Huizhen, Qu Zhiguo, Cheng Yongpan, et al. Experimental and numerical study on heat transfer and fluid flow characteristics of slotted fin-and-tube heat transfer surfaces [J]. Journal of Xi’an Jiaotong University, 2005, 39(3): 229-232 (in Chinese)
[7] 袁益超, 廖飞页, 赵存江, 等. 双向开缝翅片管换热器传热与阻力特性试验研究[J]. 热科学与技术, 2014, 13(3): 235-239Yuan Yichao, Liao Feiye, Zhao Cunjiang, et al. Experimental study on heat transfer and resistance characteristics of super slit finned tube exchanger[J]. Journal of Thermal Science and Technology, 2014,13(3): 235-239(in Chinese)
[8] Wang C. Empirical correlations for heat transfer and flow friction characteristics of herringbone wavy fin-and-tube heat exchangers[J]. International Journal of Refrigeration, 2003, 25: 673-680
[9] 孟辉, 晋欣桥, 杜志敏, 等. 开缝翅片管换热器换热和压降特性及其评价方法[J]. 上海交通大学学报, 2009, 43(5): 766-771Meng Hui, Jin Xinqiao, Du Zhimin, et al. Measurement method and experimental study on heat transfer and pressure drop characteristics of slit fin-tube heat exchangers[J]. Journal of Shanghai Jiaotong Univesity, 2009, 43(5): 766-771 (in Chinese)
[2] Lozza G, Merlo U. An experimental investigation of heat transfer and friction losses of interrupted and wavy fins for fin-and-tube heat exchangers[J]. International Journal of Refrigeration, 2001, 24(5): 409-416
[3] Naphon P. Effect of wavy plate geometry configurations on the temperature and flow distributions [J]. International Communications in Meat and Mass Transfer, 2009, 36(9): 942-946
[4] 秦萌, 尤学一. 波纹穿圆孔翅片管换热器换热特性的数值模拟[J]. 天津城建大学学报, 2015, (5): 363-368Qin Meng, You Xueyi. Numerical simulation of corrugated wear round hole fin-and-tube heat exchanger [J]. Journal of Tianjin Urban Construction University, 2015, (5): 363-368 (in Chinese)
[5] 韩占忠,王敬,兰小平. FLUENT流体工程仿真计算实例与应用[M]. 北京:北京理工大学出版社, 2004
[6] 李慧珍,屈治国,程永攀,等.开缝翅片流动和传热性能的实验研究及数值模拟[J]. 西安交通大学学报,2005, 39(3): 229-232Li Huizhen, Qu Zhiguo, Cheng Yongpan, et al. Experimental and numerical study on heat transfer and fluid flow characteristics of slotted fin-and-tube heat transfer surfaces [J]. Journal of Xi’an Jiaotong University, 2005, 39(3): 229-232 (in Chinese)
[7] 袁益超, 廖飞页, 赵存江, 等. 双向开缝翅片管换热器传热与阻力特性试验研究[J]. 热科学与技术, 2014, 13(3): 235-239Yuan Yichao, Liao Feiye, Zhao Cunjiang, et al. Experimental study on heat transfer and resistance characteristics of super slit finned tube exchanger[J]. Journal of Thermal Science and Technology, 2014,13(3): 235-239(in Chinese)
[8] Wang C. Empirical correlations for heat transfer and flow friction characteristics of herringbone wavy fin-and-tube heat exchangers[J]. International Journal of Refrigeration, 2003, 25: 673-680
[9] 孟辉, 晋欣桥, 杜志敏, 等. 开缝翅片管换热器换热和压降特性及其评价方法[J]. 上海交通大学学报, 2009, 43(5): 766-771Meng Hui, Jin Xinqiao, Du Zhimin, et al. Measurement method and experimental study on heat transfer and pressure drop characteristics of slit fin-tube heat exchangers[J]. Journal of Shanghai Jiaotong Univesity, 2009, 43(5): 766-771 (in Chinese)