Changes in the thickness, viscosity and conductivity of the outer core in the past could have led to convection patterns that caused the magnetic pole to tilt.

过去任何来自于核外层的厚度、粘性和导电性变化都会导致对流形式变化从而引起磁极倾斜。

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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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The average thickness shrinkge rate (6. 5%) is higher than that of convection drying (3.3%) and cross-grain shrinkge rate (4.8%) is lower than that of convection drying 7. 9 %.

单板厚度干缩率平均为6．8％，高于网带传送对流干燥的单板3．3％； 横纹于缩率4．8％，低于对流干燥的单板7．9％。

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