螺旋管强化传热的CFD模拟与优化
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摘要
在长度500mm的螺旋管中,采用计算流体动力学(CFD)技术对椭圆形螺旋管、圆形螺旋管和旋转角螺旋管的传热性能进行了模拟计算。计算结果表明,旋转角螺旋管具有较好的传热性能。在旋转角螺旋管中有0°、15°、30°、45°、60°5种不同的旋转角结构,其中以30°旋转角螺旋管的传热性能最好。以30°旋转角螺旋结构为基础,模拟了24°、26°、28°、32°、34°、36°等不同的旋转角螺旋结构,得到32°旋转角螺旋结构为最优,该结构螺旋管的出口温度比椭圆形螺旋管提高了19.50%,比0°旋转角螺旋管提高了11.68%。同时通过对椭圆形螺旋结构、圆形螺旋结构和32°旋转角螺旋结构进行压力和速度模拟,计算结果显示32°旋转角螺旋结构有更佳的压力分布和速度分布。
Heat exchanger is a common and crucial equipment in almost every engineering application.Energy is the foundation of economic development.The design of excellent heat transfer equipment is one of the important ways to save energy.Compared with straight heat transfer tube,spiral tube has better heat transfer performance due to the enhanced heat transfer characteristics.It is widely used in heat exchange equipments.In this paper,the structure and size of enhanced heat transfer spiral tube in industrial application were designed in order to improve the heat transfer efficiency and save energy.In the spiral tube of 500 mm length,computational fluid dynamics(CFD)was used to simulate and analyze the heat transfer performance of the ellipse spiral tube,circular spiral tube,and rotation angle spiral tube.The calculation result shows that the rotation angle spiral tube has the best heat transfer performance.For the rotary angle spiral tubes,they have five different structures with 0°,15°,30°,45°and 60°,and the heat transfer performance of that with 30°is the best.On the basis of 30°rotation angle structure,different rotation angle structures with 24°,26°,28°,32°,34°and 36° were simulated.The optimal structure obtained by simulation is of 32°rotation angle.The outlet temperature of this structure is19.50% higher than that of ellipse spiral tube,and 11.68% higher than that of 0°rotation angle spiral tube.Moreover,tubes with ellipse spiral structure,circular spiral structure and 32°rotation angle structure were simulated in pressure and velocity,and the calculation result shows that the tube with 32°rotation angle structure has the best pressure and velocity distribution,whose outlet velocity is 20.13%higher than that of ellipse spiral structure,and 16.13% higher than that of circular spiral structure.Through the optimization and simulation of the spiral tube,heat transfer efficiency and overall heat transfer performance can be improved,which provide a reference for the design of internal structure of spiral tube.These results should be instructive to the optimization of enhanced heat transfer equipment.
Heat exchanger is a common and crucial equipment in almost every engineering application.Energy is the foundation of economic development.The design of excellent heat transfer equipment is one of the important ways to save energy.Compared with straight heat transfer tube,spiral tube has better heat transfer performance due to the enhanced heat transfer characteristics.It is widely used in heat exchange equipments.In this paper,the structure and size of enhanced heat transfer spiral tube in industrial application were designed in order to improve the heat transfer efficiency and save energy.In the spiral tube of 500 mm length,computational fluid dynamics(CFD)was used to simulate and analyze the heat transfer performance of the ellipse spiral tube,circular spiral tube,and rotation angle spiral tube.The calculation result shows that the rotation angle spiral tube has the best heat transfer performance.For the rotary angle spiral tubes,they have five different structures with 0°,15°,30°,45°and 60°,and the heat transfer performance of that with 30°is the best.On the basis of 30°rotation angle structure,different rotation angle structures with 24°,26°,28°,32°,34°and 36° were simulated.The optimal structure obtained by simulation is of 32°rotation angle.The outlet temperature of this structure is19.50% higher than that of ellipse spiral tube,and 11.68% higher than that of 0°rotation angle spiral tube.Moreover,tubes with ellipse spiral structure,circular spiral structure and 32°rotation angle structure were simulated in pressure and velocity,and the calculation result shows that the tube with 32°rotation angle structure has the best pressure and velocity distribution,whose outlet velocity is 20.13%higher than that of ellipse spiral structure,and 16.13% higher than that of circular spiral structure.Through the optimization and simulation of the spiral tube,heat transfer efficiency and overall heat transfer performance can be improved,which provide a reference for the design of internal structure of spiral tube.These results should be instructive to the optimization of enhanced heat transfer equipment.
引文
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[13]DONG C,CHEN Y P,WU J F,et al.Numerical investigation on circumferential overlap trisection helical baffle heat exchanger[J].Applied Mechanics and Materials,2013,389:1035-1040.
[14]YU Y Q,MERZARI E,OBABKO A,et al.A porous medium model for predicting the duct wall temperature of sodium fast reactor fuel assembly[J].Nuclear Engineering and Design,2015,295:48-58.
[15]JIN Z J,CHEN F Q,GAO Z X.Effects of pitch and corrugation depth on heat transfer characteristics in six-start spirally corrugated tube[J].International Journal of Heat and Mass Transfer,2017,108:1011-1025.
[16]HRVIG J,SRENSEN K,CONDRA T J.On the fullydeveloped heat transfer enhancing flow field in sinusoidally,spirally corrugated tubes using computational fluid dynamics[J].International Journal of Heat and Mass Transfer,2017,106:1051-1062.
[17]JIN Z J,LIU B Z,CHEN F Q.CFD analysis on flow resistance characteristics of six-start spirally corrugated tube[J].International Journal of Heat and Mass Transfer,2016,103:1198-1207.
[18]KURNIA J C,SASMITO A P,JANGAM S V.Heat transfer in coiled square tubes for laminar flow of slurry of microencapsulated phase change material[J].Heat Transfer Engineering,2013,34(11-12):994-1007.
[19]COMINI G,SAVINO S,BARI E.Forced convection heat transfer from banks of helical coiled resistance wires[J].International Journal of Thermal Sciences,2008,47(4):442-449.
[2]陈志光,秦朝葵,熊超.螺旋管传热系数的研究[J].热科学与技术,2009,8(2):131-135.
[3]GAJAPATHY R,VELUSAMY K,SELVARAJ P,et al.CFD investigation of effect of helical wire-wrap parameters on the thermal hydraulic performance of 217fuel pin bundle[J].Annals of Nuclear Energy,2015,77:498-513.
[4]YIN S,TSENGK J,ZHAN J Y.Design of AIN-based micro-channel heat sink in direct bong copper for power electronics packaging[J].Applied Thermal Engineering,2013,52:120-129.
[5]COSTA S C,BARRENO I,TUTAR M,et al.The thermal non-equilibrium porous media modeling for CFD study of woven wire matrix of a stirling regenerator[J].Energy Conversion and Management,2015,89:473-483.
[6]CHENG D S,LI G,XIE F,et al.Simulation of heat transfer performance of NBI transmission line[J].IEEE Transactions on Dielectrics and Electrical Insulation,2013,20(4):1293-1298.
[7]ATMACA M,GIRGIN I,EZGI C.CFD modeling of a diesel evaporator used in fuel cell systems[J].International Journal of Hydrogen Energy,2016,41(14):6004-6012.
[8]YOU Y H,HUANG H,SHAO G W,et al.A three-dimensional numerical model of unsteady flow and heat transfer in ceramic honeycomb regenerator[J].Applied Thermal Engineering,2016,108:1243-1250.
[9]ALAMMAR A A,AI-DADAH R K,MAHMOUD S M.Numerical investigation of effect of fill ratio and inclination angle on a thermosiphon heat pipe thermal performance[J].Applied Thermal Engineering,2016,108:1055-1065.
[10]楚攀,何雅玲,李瑞.带纵向涡发生器的椭圆管翅片换热器数值分析[J].工程热物理学报,2008,29(3):488-490.
[11]孟庆娟,杨郁满,孙铁.基于FLUENT的3种翅片管强化传热效果模拟比较[J].石油化工设备,2014,43(2):1-4.
[12]BARI F,MORSHED A K M M.Ultra compact heat exchanger with geometry induced wall jet[J].Procedia Engineering,2015,1057:258-263.
[13]DONG C,CHEN Y P,WU J F,et al.Numerical investigation on circumferential overlap trisection helical baffle heat exchanger[J].Applied Mechanics and Materials,2013,389:1035-1040.
[14]YU Y Q,MERZARI E,OBABKO A,et al.A porous medium model for predicting the duct wall temperature of sodium fast reactor fuel assembly[J].Nuclear Engineering and Design,2015,295:48-58.
[15]JIN Z J,CHEN F Q,GAO Z X.Effects of pitch and corrugation depth on heat transfer characteristics in six-start spirally corrugated tube[J].International Journal of Heat and Mass Transfer,2017,108:1011-1025.
[16]HRVIG J,SRENSEN K,CONDRA T J.On the fullydeveloped heat transfer enhancing flow field in sinusoidally,spirally corrugated tubes using computational fluid dynamics[J].International Journal of Heat and Mass Transfer,2017,106:1051-1062.
[17]JIN Z J,LIU B Z,CHEN F Q.CFD analysis on flow resistance characteristics of six-start spirally corrugated tube[J].International Journal of Heat and Mass Transfer,2016,103:1198-1207.
[18]KURNIA J C,SASMITO A P,JANGAM S V.Heat transfer in coiled square tubes for laminar flow of slurry of microencapsulated phase change material[J].Heat Transfer Engineering,2013,34(11-12):994-1007.
[19]COMINI G,SAVINO S,BARI E.Forced convection heat transfer from banks of helical coiled resistance wires[J].International Journal of Thermal Sciences,2008,47(4):442-449.
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