水平管外沸腾强化换热的数值模拟与场协同分析  

ANALYSIS OF NUMERICAL SIMULATING THE INTENSIFY HEAT TRANSFER OF OUTSIDE BOILING HORIZONTAL PIPE WITH FIELD SYNERGY

作　　者：熊少武[1] 罗小平[1] 陈龙[1] 

机构地区：[1]华南理工大学工业装备与控制学院,广东广州510640

出　　处：《石油化工设备技术》2007年第4期24-27,31,共5页Petrochemical Equipment Technology

基　　金：国家自然科学基金项目(20006004;20676039);广东省自然科学基金项目(000412)。

摘　　要：应用FLUENT软件对制冷剂R134a在光管和横纹槽管水平管外沸腾传热进行了三维数值模拟,得到了其饱和泡状沸腾过程中体积含气率的分布规律,并比较了它们的换热系数。结果表明,横纹槽管外侧能够很好地强化沸腾传热。此外,还通过改变边界条件分析了质量流量、热流密度的变化对横纹管管外沸腾换热系数的影响。最后应用场协同理论,从局部换热角度分析了其强化机理,研究表明,横纹槽管水平管外沸腾换热得到强化是由于其凹槽前后的速度场与温度梯度场之间夹角更小、协同程度更好的缘故。Using FLUENT software to make nu- merical simulation of boiling heat transfer with refrigerant r134a flowing outside of the horizon- tal light tube and transversely—ridged tube gains the regularities of volumetric steam quality distribution during saturation process of boiling. Comparing the heat transfer coefficient of trans- versely—ridged tube with that of light tube shows that the outside of transversely—ridged tube is capable to intensify boiling heat transfer. And also analyzing the effect of different mass flow and heat flux density on heat transfer coef- ficient of the outside of transversely—ridged.Fi- nally,by using the field synergy theory analyzes the strengthening mechanism from partial heat transfer to prove that the smaller angle between velocity field and temperature gradient field sur- rounding the flute is the reason of strengthening heat transfer and desirable synergy degree.

关 键 词：横纹槽管 沸腾换热 数值模拟 场协同 

分 类 号：TK124[动力工程及工程热物理—工程热物理]