Slug Flow(Sample model : slug.dat)Slug flow is a phenomenon that occurs under special circumstances of twophase gas-liquid flow. It is the most serious scenario in two phase flow as itinvolves a moving liquid mass pushed by gases in between.Slugs can also form due to inadvertent collection of liquid in relief lines and lowquality steam flow in well collection.Slug flow is not very uniform as the process of formation of slugs is random. Thismakes it hard to predict slug forces accurately.Slugs characteristics are: Slug speed v : usually 0.5 to 1.0 times the gas velocity Slug length L : The longer, the more conservative Slug fluid density p2Slug cylinder area A=D4r time phase between successive slugsSlug forces are generated when changes in flow direction occurs as at elbows.The change in momentum causes these forces. The amplitude of the slug force for90-deg elbow is:Slug Force =2A V82Typical forcing functions on 90-deg and 45-deg elbows are shown belowIt takes the slug headforceforA V , where R2LRseconds to exit the bend and to attain the maximum slugVis the length of the bend. The peak slug force is sustainedRVseconds. It then drops inRseconds.VAt pipe reduction or at orifice locations the characteristics of the slug force historycan be different. In this case, the rise time can be assumed zero and the slugimpact duration is 2L/V.83The slug load is ...
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