论文部分内容阅读
螺旋管是一种紧凑式换热器的芯体形式,在工程中有较多应用。对螺旋管管束的流动传热情况进行了数值模拟研究,无量纲螺距为0.15~0.3,进口雷诺数为1 000~5 000,获得了横掠复杂螺旋管束的流场和温度场。结果表明:管外平均努赛尔数随雷诺数的增大而增大,欧拉数随雷诺数的增大而减小;减小螺距使平均努赛尔数和欧拉数均增大,且对欧拉数的影响要明显大于努赛尔数。同时通过对数值结果进行拟合给出了管束换热的关联式,式中考虑了无量纲螺距的影响。
Spiral pipe is a compact heat exchanger core form, there are more applications in engineering. The numerical simulation of the flow and heat transfer of the spiral tube bundles was carried out. The non-dimensional pitch was 0.15-0.3 and the inlet Reynolds number was 1 000-5 000. The flow field and the temperature field of the spiral pipe bundle were obtained. The results show that the average Nusselt number increases with the Reynolds number and the Euler number decreases with the increase of Reynolds number. The average Nusselt number and the Euler number increase with decreasing pitch, And the impact on the Euler number is significantly greater than the Nusselt number. At the same time, by fitting the numerical results, the correlation of tube bundle heat transfer is given, in which the influence of dimensionless pitch is taken into account.