采用数值计算的方法，以水为流动介质，研究了圆管内插入螺旋片状多孔介质在充分发展的层流区的换热及流动综合性能，并与环状和圆柱状多孔介质插入物进行了对比，此外，利用场物理量协同原理对计算结果进行了分析。结果表明，在圆管内插入螺旋片状多孔介质可以有效提高换热与流动的综合性能，其PEC达到3．60—3．95．
The present study introduced a tube inserted with helical screw-tape porous media which can make the fully developed laminar flow in the tube to form an equivalent thermal boundary layer, and thereby enhance the heat transfer between the fluid and the tube wall. At the same time, the increase of flow resistance in the tube is not so obvious. The overall flow and heat transfer performance for the fully developed laminar water flow in a tube inserted with helical screw-tape porous media was investigated numerically. The comparisons between helical screw-tape porous media and ring porous media and cylindrical porous media were made. And its mechanisms of enhancing heat transfer were also analyzed using the principle of field synergy. The results shows that the tube inserted with the helical screw-tape porous media can improve the flow and heat transfer performance effectively, the value of PEC varied between 3.60 and 3.95.
参考文献
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