Performance prediction of steam ejector using computational fluid dynamics: Part 2. Flow structure of a steam ejector influenced by operating pressures and geometries

Multidimensional modeling of condensing two-phase ejector flow

“…Analytical models have been made to better describe the experimental results. In the past few decades, CFD has been used to describe two-phase flow through nozzles, with some work particularly looking at the condensing ejector [8][9][10][11][12][13][14].…”

“…More recently (within the last decade), CFD simulations looking at flow (both single-phase and two-phase) through an ejector have become more complex in the aspect of modeling [9][10][11][12][13]. More sophisticated turbulence models have been used to better predict the flow and compressibility effects have been added too.…”

“…Using the same experimental setup and ejector geometries for the steam ejector in [12], Sriveerakul et al [13] did notice a series of oblique shocks and expansion waves in the mixing chamber, and refers to it was a "diamond wave." This is in Figure 1 Besides turbulence and compressibility effects, ejector geometry has an effect on the nozzle performance.…”

CFD analysis of a supersonic air ejector. Part II: Relation between global operation and local flow features

“…Judging from recent studies [3][4][5][6][7][8][9], computational fluid dynamics becomes a usual tool to investigate and predict ejectors global operation, understand the complex local flow physics and its link with the overall performances, in order to perform better design of this device or the cycle. However, in a previous paper [1], authors pointed out some shortcomings usually done by using the CFD approach.…”

“…As the secondary mass flow rate and then the entrainment rate depends primarily on its critical cross section for given conditions [2], it is believed that the investigation of the effective area location could help to understand this behavior. In their article Sriveerakul et al [8] claimed the difficulty to locate this section even with the 3 ACCEPTED MANUSCRIPT CFD possibilities. In this work, a CFD analysis is performed to explain these paradoxical results between both turbulence models investigated in [1] based on the location of the critical coss-section.…”