文档介绍：⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯最新资料推荐⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯第一章1--**********-3V1dV1V2V1dtVt2t1V13V2V(t2t)VV550106(8020)-41dV1V2V11995106110351091/dpVp2p1V166110321010Pa1-·s1-.310m1-7(1)(2)m/s1/·(3)-8(1)du2ydy1⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯最新资料推荐⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯(2)du2y212dy1-9(1)F2Adu2bLu0dyh(2)当yh时,duu0h2dy(3)当y3h时,uu0所以du02dy1-(12)··s1-11dur0dr2r3dMdFrdydAr2rsinrsindrHtgHtg2r32MdMsindr00sinr3dr2(Htg)4H4tg3Htg0sin42cos1-.-·⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯最新资料推荐⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯1-14dur023dMdFrdAdyr2rdrrrdrd2r3drd4MdM232A01--..21-·-18由1-·-%-⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯最新资料推荐⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯1-21hHg()()-22由h43gR226R22得gh3 R2 2其中则2 6R2 4R1 sincosgR2h12sin2Rcos31sin21-23根据牛顿内摩擦定律dVdr由于流速u随半径r的增加而减小,即du是负值,为了使为正值,上式在等号dr右端取负号根据已知条件d[(D2r2)]rdr442在管壁处r则1DDD2224当rD时2DD4224管壁处的阻力F1ADDL1D2L441-(kg)⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯最新资料推荐⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯().·-