The hydrodynamics of two-phase flows in the injection part of a conventional ejector

Abstract

The characteristics of two-phase flow through a 'conventional' convergent-nozzle in an entrainment chamber of an ejector apparatus are described in this paper. A unique data set comprising 350 data points was generated in an air-water horizontal test-rig. Two sets of flow conditions were established, the first one including high liquid-low gas fluids with void fractions less than 0.55, and the second one involving high gas-low liquid fluids with void fractions greater than 0.75. All considered flow-rates lied within the sub-critical flow region. Two-phase flow pressure drop multiplier based empirical correlations were developed to estimate the total mass flow-rates. In the high liquid region, Morris (1985) correlation was modified, resulting in less than 10 % error. In the high gas region, two new correlations were proposed, showing less than 10 % and 15 % of errors, respectively. The established empirical correlations were related to other available multipliers for different geometric configurations including a Venturi, an orifice plate, a gate valve, and a globe valve and were compared to 20 other void fraction correlations. The Chisholm (1983) and Huq and Loth (1992) correlations showed the highest similarities to the ones proposed for the high liquid and high gas regions, respectively.

Surrogate-Based Design Optimisation Tool for Dual-Phase Fluid Driving Jet Pump Apparatus

“…As described in the introduction section, a JP is a passive apparatus, thus reluctant to change in operating conditions. Investigative work from Mifsud et al [51], clearly demonstrates that the performance of a JP apparatus is dictated by its internal geometric features, mainly the injection, entraining and mixing bodies. These three bodies include unique geometrical features, which vary in both shape and clearance under different flow conditions; namely, type of fluid and more specifically the fluid properties such as fluid density, viscosity, compressibility and diffusivity, mutually dictating the hydrodynamic behaviour.…”

Numerical Investigation on a Liquid–Gas Ejector for Carbon Dioxide Removal Using Amine Solution: Hydrodynamics and Mass Transfer Evaluation

“…By simulating the system, all critical variables were investigated for the ejector. A great number of scholars and experts have been widely working on both the computational evaluations and experimental-based investigations around ejectors and their characteristics [19][20][21][22].…”