喷雾重叠率对带钢冷却效果的影响
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摘要
本文建立了双喷嘴气雾冷却系统的物理和数学模型,在固定单个喷嘴流量、压力、雾化角和喷嘴喷射距离的条件下,利用FLUENT软件对喷雾重叠率分别为0、25%、50%和75%时,雾化场中液滴分布、液滴速度以及带钢表面温度分布、带钢冷却速度进行仿真计算。数值模拟结果表明,当喷雾重叠率为25%时,雾化场内液滴的位置分布、带钢表面液滴的速度分布以及带钢表面的温度分布最为均匀,带钢冷却效果最佳;但与其他喷雾系统的特性参数相比,喷雾重叠率对带钢的冷却速度影响不大。
In this papar,the physical and mathematical models of double-nozzle spray cooling system were established.Under the conditions of fixed single nozzle flow,inlet pressure,atomization angle and nozzle spray distance,the droplet distribution in the atomization field,droplet velocity,temperature distribution on the surface of strip as well as the cooling rate of strip at the spray overlap ratio of0,25%,50% and 75%,respectively,were simulated and calculated by using FLUENT software.The numerical simulation results show that when the spray overlap ratio is 25%,the position distribution of droplets in the atomization field,the velocity distribution of droplets as well as the temperature distribution on the surface of strip turn out to be the most uniform,along with the optimal cooling effect of the strip steel.Nevertheless,the spray overlap ratio has slight influence on the cooling rate of strip compared with other factors.
In this papar,the physical and mathematical models of double-nozzle spray cooling system were established.Under the conditions of fixed single nozzle flow,inlet pressure,atomization angle and nozzle spray distance,the droplet distribution in the atomization field,droplet velocity,temperature distribution on the surface of strip as well as the cooling rate of strip at the spray overlap ratio of0,25%,50% and 75%,respectively,were simulated and calculated by using FLUENT software.The numerical simulation results show that when the spray overlap ratio is 25%,the position distribution of droplets in the atomization field,the velocity distribution of droplets as well as the temperature distribution on the surface of strip turn out to be the most uniform,along with the optimal cooling effect of the strip steel.Nevertheless,the spray overlap ratio has slight influence on the cooling rate of strip compared with other factors.
引文
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[2] Xu H B,Si C Q,Shao S Q,et al.Experimental investigation on heat transfer of spray cooling with isobutane(R600a)[J].International Journal of Thermal Sciences,2014,86:21-27.
[3] 王亚青,刘明侯,刘东,等.倾斜喷射时喷雾冷却无沸腾区换热特性[J].化工学报,2009,60(8):1912-1919.
[4] Zhou X X,Thomas B G,Alberto Hernández B C,et al.Measuring heat transfer during spray cooling using controlled induction-heating experiments and computational models[J].Applied Mathematical Modelling,2013,37(5):3181-3192.
[5] Somasundaram S,Tay A A O.Comparative study of intermittent spray cooling in single and two phase regimes[J].International Journal of Thermal Sciences,2013,74:174-182.
[6] 邹光明,邓如应,熊建敏,等.喷雾冷却液滴换热特性研究[J].机械设计与制造,2017(9):38-41.
[7] Pournaderi P,Pishevar A R.A numerical investigation of droplet impact on a heated wall in the film boiling regime[J].Heat and Mass Transfer,2012,48(9):1525-1538.
[8] Hou Y,Tao Y J,Huai X L,et al.Numerical simulation of multi-nozzle spray cooling heat transfer[J].International Journal of Thermal Sciences,2018,125:81-88.
[9] Xie J L,Gan Z W,Wong T N,et al.Thermal effects on a pressure swirl nozzle in spray cooling[J].International Journal of Heat and Mass Transfer,2014,73(6):130-140.
[2] Xu H B,Si C Q,Shao S Q,et al.Experimental investigation on heat transfer of spray cooling with isobutane(R600a)[J].International Journal of Thermal Sciences,2014,86:21-27.
[3] 王亚青,刘明侯,刘东,等.倾斜喷射时喷雾冷却无沸腾区换热特性[J].化工学报,2009,60(8):1912-1919.
[4] Zhou X X,Thomas B G,Alberto Hernández B C,et al.Measuring heat transfer during spray cooling using controlled induction-heating experiments and computational models[J].Applied Mathematical Modelling,2013,37(5):3181-3192.
[5] Somasundaram S,Tay A A O.Comparative study of intermittent spray cooling in single and two phase regimes[J].International Journal of Thermal Sciences,2013,74:174-182.
[6] 邹光明,邓如应,熊建敏,等.喷雾冷却液滴换热特性研究[J].机械设计与制造,2017(9):38-41.
[7] Pournaderi P,Pishevar A R.A numerical investigation of droplet impact on a heated wall in the film boiling regime[J].Heat and Mass Transfer,2012,48(9):1525-1538.
[8] Hou Y,Tao Y J,Huai X L,et al.Numerical simulation of multi-nozzle spray cooling heat transfer[J].International Journal of Thermal Sciences,2018,125:81-88.
[9] Xie J L,Gan Z W,Wong T N,et al.Thermal effects on a pressure swirl nozzle in spray cooling[J].International Journal of Heat and Mass Transfer,2014,73(6):130-140.