在對過濾器選型時(shí)，阻力損失是必須要確定的的數(shù)據(jù)，下面我教大家如何計(jì)算Y型過濾器、T型過濾器、籃式過濾器阻力損失(注：T型過濾器參照Y型等管件類過濾器，籃式過濾器參照筒殼類過濾器計(jì)算)。
Filter resistance loss
ΔP－阻力損失，Pa
ΔP－Resistance loss，Pa
λ－摩擦系數(shù)，無因次
λ－Friction coefficient, Dimensionless
Re－雷諾數(shù)，Re=(ω·dn)/u，無因次
Re－Reynolds number，Re=(ω·dn)/u，Dimensionless
ω－流體速度，m/s
ω－Fluid velocity，m/s
ρ－流體密度，kg/m3
ρ－Fluid density，kg/m3
μ－動(dòng)力粘度，kg/m·s
μ－Dynamic viscosity，kg/m·s
u－運(yùn)動(dòng)粘度u=μ/ρ，m2/s
u－movement viscosity u=μ/ρ，m2/s
L－當(dāng)量直管段長度，m，類管件過濾器查閱下表“類管件過濾器公稱直徑與當(dāng)量直管段長度關(guān)系”
L－Equivalent ascending pipe segment size，m， Kind of fitting filter consult next table “Kind of fitting filter nominal diameter and equivalent ascending pipe segment size relations”
D－類管件過濾器內(nèi)徑，m
D－type filter tube diameter，m
dn－當(dāng)量直徑m，類管件過濾器取管件內(nèi)徑"D"，筒殼式過濾器取‘4s/c
dn－Equivalent diameter m ,The kind of fitting filter take the fitting inside diameter "D"，The tube shell type filter take‘4s/c’
S－液體流通面積，m2
S－Liquid flow area，m2
C－液體濕周（濕潤周長），
C＝2X（筒體內(nèi)徑＋筒體高度）m C＝2X（筒體內(nèi)徑＋筒體高度）m
C－Liquid wetted perimeter(Moist perimeter) ，
C＝2X（cylinder diameter + cylinder height）m
ξ -入口阻力系數(shù)，取1.1
ξ - Entrance friction coefficient, Taking1.1
ξ -出口阻力系數(shù)，取0.5
ξ -Export friction coefficient, Taking0.5
類管件過濾器公稱直徑與當(dāng)量直管段長度關(guān)系
公稱直徑DN(mm) Nominal diameter DN(mm) | 50 | 80 | 100 | 150 | 200 |
當(dāng)量直管段長度L(×103mm) Equivalent ascending pipe segment size L(×103mm) | 25～30 | 18～23 | 15～20 | 22～38 | 32～40 |
公稱直徑DN(mm) Nominal diameter DN(mm) | 250 | 300 | 350 | 400 | 450 |
當(dāng)量直管段長度L(×103mm) Equivalent ascending pipe segment size L(×103mm) | 27～43 | 58～65 | 48～85 | 60～95 | 62～98 |
Category filter tube nominal diameter and length of straight pipe equivalent relations
a.對于‘Y 型’等管件類過濾器，按下式計(jì)算
a.for the 'Y-type', such as tube-type filter, determined using the following equation:
b.對于‘筒殼’類過濾器，按下式計(jì)算
b.for the 'drum shell' type filters, determined using the following equation:
