周向重叠三分螺旋折流板换热器油-水传热性能试验研究

Experimental Study on Oil to Water Heat Transfer Performance of Circumferential Overlap Trisection Helical Baffle Heat Exchangers

对倾斜角为12°、16°、20°、24°和28°的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试验研究。换热器采用公共壳体和可更换管芯结构,热流体与冷流体分别为70℃左右的导热油和11℃左右的冷却水。试验结果表明,在试验范围内周向重叠三分螺旋折流板换热器总体传热系数、壳侧传热系数、壳侧压降和综合性能综合指标ho/Δpo和ho/Δpo1/3都随着倾斜角增大而减小;倾斜角12°方案的性能指标最佳,其壳侧传热系数ho、综合性能指标ho/Δpo和ho/Δpo1/3与弓形折流板换热器的数值之比的平均值分别为1.253、1.391和1.285。

Experimental study on heat transfer performance of circumferential overlap trisection helical baffle heat exchangers of tilt angles 12＆#176;, 16＆#176;, 20＆#176;, 24＆#176;and 28＆#176; compared with a segmental baffle heat exchanger are conducted. The testing heat exchangers are constructed of a common cylinder case and replaceable tube bundle cores. The hot fluid is heat transfer oil with about 70 ℃ in the shell side and the cold fluid is cooling water with about 11 ℃ in the tube side. The results show that within the testing range, the overall heat transfer coefficient, the shell side heat transfer coefficient, pressure drop as well as comprehensive indexes ho/Δpo and ho/Δpo1/3 decrease with the increase of the tilt angle of the baffles, and the optimum scheme is the one with baffle tilt angle of 12＆#176;, and the ratios of the mean values of the shell side heat transfer coefficient ho, comprehensive index ho/Δpo and ho/Δpo1/3 of the helical scheme with baffle tilt angle of 12＆#176; over those of the segmental baffle scheme are 1.253, 1.391 and 1.285, respectively.