The result of numerical simulation for single tube, will lead to great error, neglecting transverse convection and variable film thickness, being lack of experimental test.
数值模拟主要针对单管，数学模型一般忽略横向对流和膜厚变化，结果缺乏必要的实测数据的验证，直接用于实际机组的设计会带来比较大的误差。
The result of numerical simulation for single tube, will lead to great error, neglecting transverse convection and variable film thickness, being lack of experimental test.
数值模拟主要针对单管，数学模型一般忽略横向对流和膜厚变化，结果缺乏必要的实测数据的验证，直接用于实际机组的设计会带来比较大的误差。
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