Three Dimensional Numerical Analysis of Two Phase Flow Separation Using Swirling Fluidics

Abstract

<p style="text-align:justify;"> <span>Vapor-water two phase flow separation in pressure vessel of nuclear power plants is accomplished with swirl motion using vanes. In order to reduce separation pressure loss and to make it economic, a new type </span><span>of low cost simplified in</span><span>novative separator using lattice core configuration is proposed where swirling is caused by the orthogonal driving flow. </span><span>The performance of the separator has been assessed numerically with the commercial CFD code FLUENT 14.0. The numerical analysis is compared with the experiment. The geometry and flow conditions are chosen according to the experiment. In the analysis, standard </span><i><span>k</span></i><i><span> </span></i><span><span style="font-size:10.0pt;font-family:;" "="">–</span></span><span> </span><i><span style="font-family:Symbol;">e</span></i><span> and realizable <i>k</i></span><i><span> <span style="font-size:10.0pt;font-family:;" "=""><span style="font-size:10.0pt;font-family:;" "="">–</span></span></span></i><span> </span><i><span style="font-family:Symbol;">e</span><span> </span></i><span>turbulence models are implemented. The prediction of maximum air void fraction with realizable <i>k</i></span><i><span> <span style="font-size:10.0pt;font-family:;" "="">–</span></span></i><span> </span><i><span style="font-family:Symbol;">e</span><span> </span></i><span>model was almost the same as input air void fraction but the void frac</span><span>tion computed by standard <i>k</i></span><i><span> <span style="font-size:10.0pt;font-family:;" "="">–</span></span></i><span> </span><i><span style="font-family:Symbol;">e</span><span> </span></i><span>model was compared better with the experimental results than the realizable <i>k</i></span><i><span> <span style="font-size:10.0pt;font-family:;" "="">–</span></span></i><span> </span><i><span style="font-family:Symbol;">e</span><span> </span></i><span>model. Some discrepancies in flow pattern between the experimental and simulation results are observed which might be due to the difference of nozzle shape. However, a more detailed model is necessary to arrive at the final conclusion.</span><span></span> </p

Ratio analysis of two mechanisms of static droplet evaporation driven by pressure difference

“…Kataoka et al (2009) experimentally studied the effect of pick-off ring configuration on the separation performance of swirling vane separator and the pressure drop was analyzed. Rahman et al (2013) numerically analyzed two phase flow separation using swirling fluidics based on a new type of low cost simplified innovative separator using lattice core configuration. Zhang et al (2015Zhang et al ( , 2016 studied the working mechanism of AP 1000 moisture separator consisting of primary, gravity, and secondary separators by the Lagrange-Euler approach and pointed out that the separation efficiency of primary separator was beyond 90%.…”