内置扭带换热管数值模拟及结构参数优化研究
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摘要
采用数值模拟方法对内插扭带式换热管换热过程进行模拟,分析了管内流动与传热特征,研究了扭带尺寸参数对管内流动与传热的影响。结果表明,随扭带余隙率增大,传热系数逐渐减小,传热性能降低,但过小的余隙率会增大摩擦阻力。传热系数随扭距增加先增大后减小,阻力系数随扭距增加逐渐减小。综合考虑扭带参数对传热与流动的影响,对换热管内置扭带的结构参数进行了优化。
The numerical simulation method was used to simulate the heat transfer process of the heat exchanger tube inserted with twisted plate. The flow and heat transfer characteristics in the tube were analyzed. Moreover, the effects of twisted plate size parameters on flow and heat transfer rate in the tube were studied. The results indicated that the heat transfer coefficient and the heat transfer performance decreased with increasing of the clearance ratio of twisted plate. But, too small clearance ratio will increases the friction resistance dramatically. Finally, the structural parameters of twisted plate in heat exchanger tubes were optimized.
The numerical simulation method was used to simulate the heat transfer process of the heat exchanger tube inserted with twisted plate. The flow and heat transfer characteristics in the tube were analyzed. Moreover, the effects of twisted plate size parameters on flow and heat transfer rate in the tube were studied. The results indicated that the heat transfer coefficient and the heat transfer performance decreased with increasing of the clearance ratio of twisted plate. But, too small clearance ratio will increases the friction resistance dramatically. Finally, the structural parameters of twisted plate in heat exchanger tubes were optimized.
引文
[1]庄严,吕明璐,张瑶,李旭,王诗茹.固定管板式换热器强度分析与评定[J].当代化工,2018,47(03):566-568.
[2]Chang S W, Jan Y J, Jin S L. Turbulent heat transfer and pressure dropin tube fitted with serrated twisted tape[J]. International Journal ofThermal Sciences, 2007, 46(5):506-518.
[3] Eiamsa-Ard S, Kiatkittipong K, Jedsadaratanachai W. Heat transferenhancement of Ti O2/water nanofluid in a heat exchanger tubeequipped with overlapped dual twisted-tapes[J]. Engineering Science&Technology An International Journal, 2015, 18(3):336-350.
[4]李行.内置组合式扭带换热管内流动与传热的数值模拟[D].长沙理工大学,2011.
[5]周路遥,贾晖,刘伟.管内内插双斜杆的强化传热数值模拟及结构优化研究[J].工程热物理学报,2013,34(05):957-960.
[6]张晓屿,刘志春,刘伟,周路遥.圆管内插入多个螺旋片的传热与流动的数值模拟研究[J].工程热物理学报,2013,34(02):310-313.
[7]彭德其,史冰乐,俞天兰,俞天翔,刘阳平,叶磊.振动往复螺旋清洗机构及其防垢性能[J].化工学报,2013,64(09):3168-3174.
[8]韩继广,吴新,周翼,詹岳.管内插入扭带及螺旋线圈的传热与阻力特性实验研究[J].热能动力工程,2012,27(04):434-438+514-515.
[9]刘舜尧,管文华.管壳式换热器纽带强化传热实验研究[J].广东化工, 2009, 36(10):175-177+188.
[10] Fu W S, Tseng C C, Huang C S. Experimental study of the heattransfer enhancement of an outer tube with an inner-tube insertion[J].International Journal of Heat&Mass Transfer, 1995, 38(18):3443-3454.
[11]金志浩,周晓坤,张金玺,陈东.分离式热管蒸发段传热特性的数值研究[J].当代化工,2015,44(10):2490-2493.
[2]Chang S W, Jan Y J, Jin S L. Turbulent heat transfer and pressure dropin tube fitted with serrated twisted tape[J]. International Journal ofThermal Sciences, 2007, 46(5):506-518.
[3] Eiamsa-Ard S, Kiatkittipong K, Jedsadaratanachai W. Heat transferenhancement of Ti O2/water nanofluid in a heat exchanger tubeequipped with overlapped dual twisted-tapes[J]. Engineering Science&Technology An International Journal, 2015, 18(3):336-350.
[4]李行.内置组合式扭带换热管内流动与传热的数值模拟[D].长沙理工大学,2011.
[5]周路遥,贾晖,刘伟.管内内插双斜杆的强化传热数值模拟及结构优化研究[J].工程热物理学报,2013,34(05):957-960.
[6]张晓屿,刘志春,刘伟,周路遥.圆管内插入多个螺旋片的传热与流动的数值模拟研究[J].工程热物理学报,2013,34(02):310-313.
[7]彭德其,史冰乐,俞天兰,俞天翔,刘阳平,叶磊.振动往复螺旋清洗机构及其防垢性能[J].化工学报,2013,64(09):3168-3174.
[8]韩继广,吴新,周翼,詹岳.管内插入扭带及螺旋线圈的传热与阻力特性实验研究[J].热能动力工程,2012,27(04):434-438+514-515.
[9]刘舜尧,管文华.管壳式换热器纽带强化传热实验研究[J].广东化工, 2009, 36(10):175-177+188.
[10] Fu W S, Tseng C C, Huang C S. Experimental study of the heattransfer enhancement of an outer tube with an inner-tube insertion[J].International Journal of Heat&Mass Transfer, 1995, 38(18):3443-3454.
[11]金志浩,周晓坤,张金玺,陈东.分离式热管蒸发段传热特性的数值研究[J].当代化工,2015,44(10):2490-2493.