多头螺旋管换热过程的三维数值模拟

随着节能减排的生态发展理念深入人心，如何最大限度地提高能源的利用率，成为时下研究的热点．文中以多头螺旋管为研究对象，并以当量直径的光管作为基准管，运用有限元分析软件ANSYS对模型的传热过程进行数值模拟，得出了换热过程中温度场与流场的分布状况，而后结合传热学中的边界层理论和协同场理论对结果进行综合分析．结果表明：在等热流的情况下，多头螺旋管的换热性能明显优于光管，相对光管，多头管内流体的出口温升相对提高了2．6倍，出口速度相对下降50％；其特殊的内外凸筋结构，是强化传热的主要原因，同时，凸筋造成流体的有涡流动，也使得多头螺旋管管壁不易结垢．

The 3-D numerical simulation of heat transfer process for multi-start spiral pipe

The utilization of energy has become the current hotspot with the development concept of energy saving. This article studies the 3-d numerical simulation of heat transfer process for multi-start spiral pipe by using the light pipe with equivalent diameter as the benchmark tube. The heat transfer process of models is simulated through the ANSYS, obtaining the distribution of the temperature and flow field in the heat transfer process. The results are analyzed comprehensively by the boundary layer theory and collaborative field theory in heat transfer. The results show： the heat transfer performance of multi-start spiral pipe is significantly better than that of the light pipe with the same heat flux. In comparison with the light pipe, the exit temperature of the fluid for the multi-start spiral pipe is increased to 2.6 times and the exit speed is reduced to 50 %. The main reason of heat transfer enhancement lies in its internal and external rib structure. The walls of multi-start spiral pipe are not liable for scaling for fluid vortex flow due to its rib structure.