它们在流体流速压力下开启，在重力作用下关闭。
They are opened by velocity pressure, and closed by gravity.
主流区流体流速及温度场分布不均匀，不利于硫颗粒沉降。
However the distributing of velocity and temperature is not uniform in the mid fluid, So it is not helpful for sedimentation of matte drops.
考察流体流速、壁面温度、主体温度和溶液浓度等参数对结垢速率的影响。
The effects of some factors on the fouling rate have been studied, such as flow velocity, wall temperature, bulk temperature and solution concentration.
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