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对倾斜角为20°、24°、28°和32°的单头以及32°的双头周向重叠三分螺旋折流板换热器和弓形折流板换热器的传热和压降性能进行了测试,换热器采用公共壳体和可更换管芯结构。采用壳侧轴向雷诺数和轴向欧拉数分别作为反映壳侧流量和阻力系数的无因次参数。试验结果显示在试验范围内周向重叠三分螺旋折流板换热器壳侧换热系数、壳侧压降和综合性能指标都随着倾斜角增大而减小;倾斜角20°方案的性能指标最佳,其平均壳侧努塞尔数和轴向欧拉数与弓形折流板方案的数值之比分别为1.123和0.45;双头螺旋折流板方案的换热系数和压降都大于同样倾斜角的单头螺旋折流板方案,但两者的综合性能较接近。
For heat transfer and pressure drop of single-head and 32 ° double-headed circumferential overlapped three-part helical baffle heat exchangers and bowed baffle heat exchangers with 20 °, 24 °, 28 ° and 32 ° inclination angles The performance was tested with a common shell and replaceable die structure for heat exchangers. Axial Reynolds number and axial Euler number are used as dimensionless parameters to reflect shell side flow rate and drag coefficient, respectively. The experimental results show that the shell side heat transfer coefficient, the shell side pressure drop and the overall performance index of the circumferentially overlapping triple baffle heat exchanger decrease with the increase of the inclination angle within the experimental range. The inclination angle of 20 ° The performance index is the best. The ratio of Nusselt number and axial Euler number to the bow baffle scheme are 1.123 and 0.45, respectively. The heat transfer coefficient and pressure drop of the double helix baffle scheme are both Greater than the same tilt angle of the single spiral baffle program, but the overall performance of the two closer.