Using CFD Method To Predict Wet Gas Measurement By Means Of Equivalent Particle Diameter

With the development of petroleum and natural gas industry, wet gasmeasurement has become a very important content of multiphase flow. Throughacademic summarize and real flow experiments, the researchers put forward manymeasuring models of wet gas measurement. In order to explore methods of wet gasmeasurement, this paper study effect of computational fluid dynamics (CFD)technology. The study includes the following four issues.Firstly, this paper studied the influence of liquid particle diameter on wet gasflow in the Eulerian multi-phase model, researched the change rule of pressuredistribution, the distribution of liquid phase and over-reading. On this basis,equivalent liquid particle diameter was defined and stated, its physical interpretationwas analyzed according to the momentum equations, revealing its link with thefriction coefficient between gas and liquid.Secondly, this paper applied the method of equivalent particle diameter to thesimulation for wet gas. Under the conditions of high pressure, over-reading forstandard venture, which structure is DN100_=0.4, DN100_=0.6andDN100_=0.75, is predict with the maximum relative error of1%. Analogously,under the conditions of low pressure, over-reading for standard venture, whichstructure is DN50_=0.55, is predict with the maximum relative error of2.5%. Thusit is clear that the method of equivalent particle diameter can be used to predict theover-reading in wet gas measurement.Finally, this paper also introduced structure, principle and process of Fluent﹣acommercial computational fluid dynamics software, discussed multi-phase model andturbulence model, established the physical model for the simulation experiment.