have been found to be more suitable for extrapolation to a wide range of system parameters than the other two-phase flow regime maps available in the literature. The original criteria for all cases are used to predict the transition lines, except for the transition to dispersed flow regime in...
Many flow regime maps in current use for modelling two-phase flow with rod bundles were developed for adiabatic situations and without interface mass transfer being taken into account. This paper describes the development of a flow regime map which includes the modeliing the mass transfer...
two-phase Rowstratified flowflow regime mapinterfacial drag coefficientvoid fractionreactor safetysafety analysisTRAC-PF1Horizontally stratified two-phase flow is one of the important phenomena for analysis of small-break loss of coolant accidents (SBLOCAs) in a pressurized water reactor (PWR). Thus,...
17 Flow pattern observations with experimental transition lines for R134a, D = 0.5 mm, L = 70.7 mm , Tsat = 35 °C, ΔTsub = 5 °C using laser plotted in two different formats: (b) Flow pattern map, by Revellin and Thome (2006;2007) 3.1 气液两相流流型的实验研 3.1.2 微观尺度...
Introduction（简介）1、Flowpatternorflowregime（流型）——gas-liquidtwo-phaseflowhasobviousinterface（气液两相流动具有明显的流动界面）——hasvariousgeometricconfigurations（流动具有各种不同的几何构型）2、Importantphysicalparametersindeterminingtheflowpattern:（流型）——surfacetension（表面张力）Keepchannels...
In this review paper, the two-phase cocurrent downward flow regime map and models are compared for the 25.4mm, 40mm, 50.8mm, 80mm and 101.6mm pipe diameters and compared through the use of objective and subjective methods such as neural network, ReliefF-Fuzzy C-means clustering algorithm, di...
区域,分层流具有弯曲的界面,并且和环状流 区分模糊。 Fig.14 Comparison of the predicted flow regime boundaries of the Ullmann and Brauner (2006) flow map in a horizontal 1mm tube to the experimental data of Triplett et al.(1999), where ε G is the cross-...
The prediction of flow regime transition, phase separation, phase change, and phase distributions for most geometries of practical importance is still very difficult or impossible. The difficulties of predicting two-phase flows stem from the current inability to formulate the physics of two-phase flow...
ow-pattern map. The parameter groups, which are based on semitheoretical derivations for different ?ow-pattern transitions in horizontal or slightly inclined channels is the angle of inclination , are as follows: X= dp/dz dp/dz L G 1/2 as if the gas in the two-phase ?ow were ?owing ...
Two-phase flowmodels are generally known to bear numerical discontinuities which stem from switching equations at flow-regime transition boundaries. This is expected in the present study regarding constitutive models forC0,〈vvdes〉αandfm. Though this switching can be easily coded by combining IF-EL...