On the contrary, the radial gradient of axial velocity decreases downwardly along the axial direction. Therefore, the axial velocity distribution becomes horizontal gradually.
轴向速度的径向梯度沿轴向向下逐渐变小，轴向速度分布也逐渐趋于水平直线状。
In the diffusion process, CO2 would be moving at its initial velocity in the radial direction and freely diffuse in its vertical directions.
二氧化碳扩散过程中，径向上有一个初始速度，而在横向上表现为自由扩散。
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