铸轧薄带气雾冷却用喷嘴的换热特性实验研究  

Experimental Research on Heat Transfer of Aerosol Nozzle for Cooling Thin Strip After Cast Rolling

作　　者：刘国勇[1] 李晓杰 王彬[2] 宋则进[2] 杨邵伟[2] 朱冬梅[1] LIU Guoyong;LI Xiaojie;WANG Bin;SONG Zejin;YANG Shaowei;ZHU Dongmei(School of Mechanical Engineering,University of Science and Technology Beijing,Beijing 100083,China;Capital Engineering and Research Incorporation Limited,Beijing 100176,China)

机构地区：[1]北京科技大学机械工程学院,北京100083 [2]中冶京诚工程技术有限公司,北京100176

出　　处：《热加工工艺》2018年第18期203-207,共5页Hot Working Technology

摘　　要：铸轧薄带冷却采用气雾多喷嘴具有冷却时间短,冷却均匀等特点。通过实验研究了双喷嘴气雾冷却的换热特性。研究的因素包括水压、气压、喷嘴间距及高度、钢板温度等。结果表明,气压越大,钢板的表面传热系数越大,表面传热系数的增量在1000~1200 W/（m^2·℃·bar）;水压越大,钢板的表面传热系数同样变大,表面传热系数增量在400W/（m^2·℃·bar）;喷嘴间距越大、喷嘴高度越大,钢板的表面传热系数越小,喷嘴间距增大时,表面传热系数增量为-10W/（m^2·℃·mm）,喷嘴高度增大时,表面传热系数增量在-4^-6 W/（m^2·℃·mm）。钢板温度每升高1℃,表面传热系数增量为-2^-4 W/（m^2·℃~2）。可以得出：气压对表面传热系数的影响最显著,水压以及喷嘴间距、高度次之,钢板温度对传热系数的影响最小。Aerosol cooling by multi-nozzles is characterized with short cooling time and uniform cooling during.the cooling of Cast-rolled strip.The heat transfer characteristics of double nozzle spray cooling were studied experimentally.The research factors include water pressure,air pressure,nozzle spacing and height,plate temperature,etc.The results show that,the surface heat transfer coefficient of steel plate increases with the increase of air pressure,and the increment of surface heat transfer coefficient is about 1000-1200 W/（m^2·℃·bar）.The higher the water pressure,the larger the surface heat transfer coefficient of steel plate,and the increment of surface heat transfer coefficient is about 400 W/（m^2·℃·bar）.The larger the distance between nozzles,the higher the nozzle height,the smaller the surface heat transfer coefficient of steel plate.When the distance between nozzles increases,the increment of surface heat transfer coefficient is-10 W/（m^2·℃·mm）.When the nozzle height increases,the increment of surface heat transfer coefficient is in-6--4 W/（m^2·℃·mm）.When the temperature of steel plate increases by 1℃,the increment of surface heat transfer coefficient is-4--2 W/（m^2·℃~2）.Therefore,the air pressure has the most significant effect on the surface heat transfer coefficient,followed by the water pressure,the distance between nozzles and nozzle height,and the steel plate temperature has the least effect on the heat transfer coefficient.

关 键 词：气雾冷却 喷嘴 反传热 表面传热系数 

分 类 号：TG142.31[一般工业技术—材料科学与工程] TG335.55[金属学及工艺—金属材料]