摘要
采用实验方法测试了三维内肋螺旋管内的流动传热性能。实验用的螺旋管曲率δ =0 .0 6 6 3,测试段长 1.15m ,试验工质为水。对螺旋光管和两种不同结构尺寸的三维内肋管进行了测试 ,测量的雷诺数范围约为Re=10 0 0～ 85 0 0。结果表明 ,三维内肋对螺旋管内的对流换热仍然有较大的强化效果 ,同时流阻也有一定程度的增加。与未加肋的螺旋光管相比 ,在测试的流动范围内 ,两种三维内肋管的平均换热强化比达 1.71和 2 .0 3,热力性能系数为 1.2～ 1.6 6。
Tests and measurements were performed to investigate the flow and heat transfer performance in a three-dimensional internally finned helical pipe with a curvature of 0.0663 and measurement section length of 1.15 m. With water serving as working medium tests were carried out in a spiral bare pipe and a three-dimensional internally finned pipe of two different structural dimensions. The range of Reynolds number is Re=1000-8500. The test results indicate that a relatively high intensification of convection heat exchange can be achieved in the spiral pipe by the use of three-dimensional inner fins, which is accompanied by a moderate increase in flow resistance. In comparison with bare spiral pipes without fins the average intensification ratio of heat exchange for the two kinds of three-dimensional internally finned pipe within the range of measured flows can reach 1.71 and 2.03 respectively with the thermodynamic performance factor being assessed at 1.2-1.66.
出处
《热能动力工程》
EI
CAS
CSCD
北大核心
2004年第3期270-273,共4页
Journal of Engineering for Thermal Energy and Power
关键词
螺旋管
肋化
强化传热
spiral tube, ribbed tube, intensified heat transfer
