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时间:2018-11-12
《过滤器阻力损失》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、过滤器阻力损失FilterresistancelossΔP--阻力损失,PaΔP--Resistanceloss,Paλ--摩擦系数,无因次λ--Frictioncoefficient,DimensionlessRe-雷诺数,Re=(ω·dn)/u,无因次Re-Reynoldsnumber,Re=(ω·dn)/u,Dimensionlessω-流体速度,m/sω-Fluidvelocity,m/sρ-流体密度,kg/m³ρ-Fluiddensity,kg/m³μ-动力粘度,kg/m·sμ-Dynamicviscosity,kg/m·su-运动粘度u=μ/
2、ρ,m²/su-movementviscosityu=μ/ρ,m²/sL-当量直管段长度,m,类管件过滤器查阅下表“类管件过滤器公称直径与当量直管段长度关系”L-Equivalentascendingpipesegmentsize,m,Kindoffittingfilterconsultnexttable“Kindoffittingfilternominaldiameterandequivalentascendingpipesegmentsizerelations”D-类管件过滤器内径,mD-typefiltertubediameter,mdn-当量直径
3、m,类管件过滤器取管件内径"D",筒壳式过滤器取‘4s/cdn-Equivalentdiameterm,Thekindoffittingfiltertakethefittinginsidediameter"D",Thetubeshelltypefiltertake‘4s/c’S-液体流通面积,m²S-Liquidflowarea,m²C-液体湿周(湿润周长),C=2X(筒体内径+筒体高度)mC=2X(筒体内径+筒体高度)mC-Liquidwettedperimeter(Moistperimeter),C=2X(cylinderdiameter+cylin
4、derheight)mξ-入口阻力系数,取1.1ξ-Entrancefrictioncoefficient,Taking1.1ξ-出口阻力系数,取0.5ξ-Exportfrictioncoefficient,Taking0.5类管件过滤器公称直径与当量直管段长度关系Categoryfiltertubenominaldiameterandlengthofstraightpipeequivalentrelations公称直径DNNominaldiameterDN5080100150200当量直管段长度L(×10³mm)Equivalentascendingp
5、ipesegmentsizeL(×10³mm)25~3018~2315~2022~3832~40公称直径DNNominaldiameterDN250300350400450当量直管段长度L(×10³mm)EquivalentascendingpipesegmentsizeL(×10³mm)27~4358~6548~8560~9562~98a.对于‘Y型’等管件类过滤器,按下式计算forthe'Y-type',suchastube-typefilter,determinedusingthefollowingequation:b.对于‘筒壳’类过滤器,按下式
6、计算orthe'drumshell'typefilters,determinedusingthefollowingequation:过滤面积及孔目数FiltrationareaandHoleitemofnumber过滤面积通常指丝网的有效流通面积,可以查阅下表“滤网规格”得知有效面积,滤网总面积与有效面积率的乘积即为过滤面积(有效流通面积)。通常,考虑过滤面积按过滤器公称通径的20倍设计,已足够满足使用场合。除非在非常见的特殊环境使用,才予以特殊考虑。Thefiltrationareausuallyreferstosilkscreen'seffectiv
7、eflowarea,Maytheconsultnexttable“themeshspecification”knowingeffectivearea,Meshtotalareaandactivesurfacerateproductnamelyforfiltrationarea(effectiveflowarea).Usually,Theconsiderationfiltrationareaaccordingtothefilternominalsize's20timeofdesigns,enoughhassatisfiedusesituation.Only
8、ifinnon-thecommonspecialenvironmentuse,o
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