And, in terms of direction, it will be normal to the surface.
对于方向，则是曲面的法方向。
The results show that the heat transfer coefficient of wall surface is proportional to air velocity under normal airflow velocity, but it is not affected significantly by airflow direction.
研究表明：在通常室内风速条件下，墙体表面换热系数与风速速率的大小成正比，而风向对墙体表面换热系数的影响不明显。
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