Last Updated：2025/11/25
(hydraulics, surface science) For a porous material, the ratio of porosity (ratio of volume of interstitial space filled with fluid to volume of material) to specific surface area (ratio of surface area in contact with fluid to volume of material); for a pipe or channel, the ratio of cross-sectional area to wetted perimeter.
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hydraulic radius
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Source Word
hydraulic radius
Noun
(hydraulics,
surface
science)
For
a
porous
material,
the
ratio
of
porosity
(ratio
of
volume
of
interstitial
space
filled
with
fluid
to
volume
of
material)
to
specific
surface
area
(ratio
of
surface
area
in
contact
with
fluid
to
volume
of
material);
for
a
pipe
or
channel,
the
ratio
of
cross-sectional
area
to
wetted
perimeter.
Japanese Meaning
多孔質材料の場合：液体で満たされた間隙の体積比（材料全体における液体が占める割合）を、材料に接する表面積の比（液体と接する面積が材料体積に対する割合）で割った値。 / パイプや水路の場合：横断面積を接触している（濡れている）周囲の長さで割った値。
Sense（1）
(hydraulics,
surface
science)
For
a
porous
material,
the
ratio
of
porosity
(ratio
of
volume
of
interstitial
space
filled
with
fluid
to
volume
of
material)
to
specific
surface
area
(ratio
of
surface
area
in
contact
with
fluid
to
volume
of
material);
for
a
pipe
or
channel,
the
ratio
of
cross-sectional
area
to
wetted
perimeter.
（ plural ）
