摘要
根据传热场协同理论,研发出改进型缩放传热管——急扩加速流缩放管,对缩放管的凹凸肋面作了改进,使其能满足两场矢量夹角小于90°强化对流条件的传热管段比例由原先的60%提升到90%,从而有效地加强了近壁处传热滞流底层的对流传热作用。采用漩流片支撑取代空心环网板支撑,可使经过支撑物的流体形成自漩流的流动状态,从而可以发挥管间支撑物的对流强化传热作用。实际应用表明,与目前国内较先进的光滑管换热器相比,急扩加速流缩放管换热器换热面积减少约35%,设备总质量降低约45%。
Modified type of converging-diverging tube, i.e. sharp expansion and accelerated flow converging-diverging tube is explored in terms of field synergy principle. The change is made on both concave and protruding sides to make the angle between velocity vector and temperature gradient less than 90° and ensure better coordination between velocity and temperature fields. The length of the section which could promote the heat transfer rises from 60% to 90% of the total length of tube, so the heat transfer in heat viscous sublayer near the wall is intensified effectively. The twisted-leaf-net is adopted as tube support element to replace original ring-net to cause the fluid self-swirling through the support. So the heat transfer can be enhanced effectively by the tube supports. Applications reveal that heat exchange area is reduced by 35% and the total facility weight lost 45% by use of sharp expansion and accelerated flow converging-diverging tube heat exchanger compared to domestic advanced smooth tube heat exchangers.
出处
《硫酸工业》
CAS
2005年第5期22-24,共3页
Sulphuric Acid Industry
关键词
急扩加速流缩放管
漩流片支撑
换热器
结构
应用
sharp expansion and accelerated flow converging-diverging tube, twisted-leaf-net support, heat exchanger, construction, application
