摘要
以松花江水为工质,采用对比的实验方法对不连续双斜向内肋管与光管的传热和污垢特性进行研究,并用数值方法模拟不连续双斜向内肋管内流场和壁面剪切力。结果表明:随着流速的增加,不连续双斜向内肋管Nu数的增长趋势开始变缓;不连续双斜向内肋管在3种流速下都出现结垢诱导期,流速高时诱导期会相对更长,说明其内肋对管型结构会延长结垢时间;管内流速约达到0.5m/s后,提高流速对污垢热阻的影响已不明显,且与不连续双斜向内肋管传热特性的变化趋势相关;由于不连续双斜向内肋管的内部流场和剪切力的周期性变化,不连续双斜向内肋管的换热和抗垢性能均优于光管。
Using the Songhua River water as the cooling water,the characteristics of heat transfer and the fouling of the discrete double inclined ribs tube and the plain tube were studied by the method of comparative experiments,the flow field and wall shear stress in the discrete double inclined ribs tube were numerically simulated and analyzed.The results show that with the increase of flow velocity,the discrete double inclined ribs tube Nusselt trend of growth begin slowing down.Discrete double-inclined ribs tube have fouling induction period in the three flow rates,the higher flow rate,the induction period will be longer,double inclined ribs could extend the fouling time.When the flow rate increases to 0.5 m/s,improving velocity has not obvious effect on the asymptotic value of fouling resistance,and it is related to the heat transfer characteristics of the discrete double inclined ribs tube.The discrete double inclined ribs tube has better heat transfer performance and anti-fouling ability than that of plain tube,the periodic change of flow field and wall shear stress in the discrete double inclined ribs tube may be the primary reason.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2012年第32期64-68,11,共6页
Proceedings of the CSEE
基金
国家自然科学基金项目(51076025)~~
关键词
不连续双斜向内肋管
松花江水
诱导期
污垢特性
传热特性
抗垢
discrete double inclined ribs tube
Songhua River water
induction period
fouling characteristics
heat transfer characteristics
anti-fouling
