TWO-PHASE FLUID FLOWFluid Flowwhere:DP = Pressure spikelbfft2r = Density of the fluidlbmft3c = Velocity of the pressure waveftsec(Speed of sound in the fluid)Dv = Change in velocity of the fluidftsecgc= Gravitational constant 32.17lbm ftlbf sec2Example: Pressure spikeWater at a density of 62.4 lbm/ft3 and a pressure of 120 psi is flowing through a pipeat 10 ft/sec. The speed of sound in the water is 4780 ft/sec. A check valve suddenlyclosed. What is the maximum pressure of the fluid in psi?Solution:PMax= PStatic + DPSpikePMax= 120lbfin2rc DVgcPMax= 120lbfin262.4lbmft34780ftsec10ftsec32.17lbm ftlbf sec2PMax= 120lbfin292,631lbfft2ft2144 in2PMax= 120lbfin2643.3lbfin2PMax= 763.3 psiHT-03 Page 44 Rev. 0
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