Universal calculation model of mass center equivalent rectangle for helical baffle heat exchangers

doi:10.11949/0438-1157.20200085

Abstract

Abstract:

The existing approach of calculating cross-sectional area of the spiral channel of the helical baffle heat exchanger (HBHX) is according to the minimum cross section of the channel throttled by tube row, while the actual cross section of the spiral channel is composed of both the minimum cross section and the maximum cross section at inter tube space, and the spiral flow does not pass through the minimum cross section instantaneously. Thus the prediction has been in vain of the shell side Nusselt number and friction factor with universal correlations of the Reynolds number for helical baffle heat exchangers because of the incorrect value of Reynolds number. A novel model of mass center equivalent rectangle (MCER) is presented for more accurate calculation of the cross-sectional area of the helical flow channel of the HBHX. The verification of the MCER model is performed with satisfactory results for HBHXs by both the heat exchanger commercial design software HTRI and some experimental results in literatures. Under the same conditions, the error between the Nusselt number Nu_o calculated by the MCER model and the result calculated using the heat exchanger design software HTRI is in the range of -10% to 5%, and the errors with the experimental results of the two groups of literature are within the range of ± 18% and -5%—15%, but the error of the friction factor formula results compared with the results of the above sources is relatively large, and needs to be further improved.

Key words: heat transfer, model reduction, experimental validation, helical baffle heat exchangers, mass center equivalent rectangle

摘要：

现有螺旋折流板换热器(HBHXs)螺旋通道的截面积是按照通道中被管排阻挡的最小截面计算的，而实际的螺旋通道截面是由最小截面和管间的最大截面共同构成的，螺旋流是逐步通过最小截面的。由于按此最小截面公式计算的Reynolds数不准确，因此无法获得预测Nusselt数和摩擦因子与Reynolds数关系的通用关联式。提出了一种新型质心当量矩形(MCER)模型，以更精确地计算螺旋折流板换热器的螺旋通道的截面积和壳侧流体Reynolds数，并采用商用软件HTRI和文献的实验数据对MCER模型进行了验证，获得了较满意的结果。在相同条件下，按MCER模型计算壳侧Nusselt数Nu_o的结果与采用换热器设计软件HTRI所计算结果的误差在-10%~5%范围内，与两组文献实验结果的误差分别在±18%和-5%~15%范围内，但其摩擦因子的公式结果与上述来源结果比较的误差都比较大，需要进一步完善。

关键词: 传热, 模型简化, 实验验证, 螺旋折流板换热器, 质心当量矩形

CLC Number:

TK 124

Shuxing ZHENG, Zilong ZHU, Yaping CHEN, Jiafeng WU. Universal calculation model of mass center equivalent rectangle for helical baffle heat exchangers[J]. CIESC Journal, 2020, 71(7): 3050-3059.

郑舒星, 朱子龙, 陈亚平, 吴嘉峰. 螺旋折流板换热器质心当量矩形通用计算模型[J]. 化工学报, 2020, 71(7): 3050-3059.

Figures/Tables 1

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