## Guide to the flow relationships and statistical methods used in the Data items on two-phase flow pressure gradients in straight pipes |

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Babcock and Wilcox bubbles Chemical Engineers Churn flow component of pressure defined Definition Influence dpg/dz due to friction due to gravity due to momentum dynamic viscosity Engineering Sciences Data Equation evaporating experimental data flow pressure gradients FLOW RELATIONSHIPS frictional component frictional pressure gradients gas or vapour Gradient in Two-Phase gravitational component heat addition heated surface independent variables influence the flow interfacial tension liquid film liquid flows liquid phase magnitude major term margin for error mass flow rate mass velocities mean correction factor mean density Mechanical Engineers methods for calculating mixtures flowing momentum-change component Pa/m particularly Performance Charts prediction methods pressure gradient due pressure loss REGENT STREET region Sciences Data Unit Section selected batch significance single-phase flow slug flow standard deviation straight pipes Sub-series three components time-averaged tube wall two-phase flow pressure two-phase mixture two-phase multiplier values of pressure Velocity ratio Vertically-Upwards Flowing Mixtures void fraction voidage volume flow fraction