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单词 hydraulic radius
释义
hydraulic radius

Chemical Engineering
  • The cross section or area through which a fluid flows divided by the wetted perimeter:

    rH=AP

    where A is the area and P is the wetted perimeter. It is used for open channel flow, and for wide channels and represents the depth of the channel. Note that it is not equal to half the mean hydraulic diameter.


Geology and Earth Sciences
  • Ratio between the cross-sectional area of a stream channel and the length of the water-channel contact at that cross-section (the wetted perimeter). It is a measure of channel efficiency: the higher the ratio, the more efficient is the channel in transmitting water.


Geography
  • Also known as hydraulic mean, this is the ratio of the cross-sectional area of a stream to the length of the wetted perimeter (cross-sectional length of a river bed). The hydraulic radius is a measure of the efficiency of the river in conveying water—if the hydraulic radius is large, there is little friction.


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