Ejector primary nozzle steam condensation: area ratio effects and mixing layer development
Article
Article Title | Ejector primary nozzle steam condensation: area ratio effects and mixing layer development |
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ERA Journal ID | 3658 |
Article Category | Article |
Authors | Ariafar, Kavous (Author), Buttsworth, David (Author), Sharifi, Navid (Author) and Malpress, Ray (Author) |
Journal Title | Applied Thermal Engineering |
Journal Citation | 71 (1), pp. 519-527 |
Number of Pages | 8 |
Year | 2014 |
Publisher | Elsevier |
Place of Publication | United Kingdom |
ISSN | 1359-4311 |
1873-5606 | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.applthermaleng.2014.06.038 |
Web Address (URL) | https://www.sciencedirect.com/science/article/pii/S1359431114005183 |
Abstract | Recent ejector simulations based on wet steam modeling give significantly different performance figures relative to ideal gas modeling, but the origins of such differences are not clear. This paper presents a numerical investigation of flow in the primary nozzle of a steam ejector to further explore the differences between ideal gas and wet steam analysis of ejector flows. The wet steam modeling was first validated using primary nozzle surface pressure data from three experiments reported in the literature. Ejector primary nozzles with area ratios (AR) of 11, 18 and 25 were then simulated using wet steam and ideal gas models. The wet steam simulations show that nozzle static pressures are higher than those for ideal gas model, and in the AR = 25 case, the static pressure is larger by a factor of approximately 1.7. In contrast, no significant difference exists between the nozzle momentum flux for both ideal gas and wet steam models, except the vicinity of the nozzle throat where nucleation occurs. Enhanced mixing between primary and secondary streams, which arises because primary stream condensation reduces compressibility in the mixing layer, is proposed as an explanation of the increased entrainment ratio observed in recent wet steam ejector simulations. |
Keywords | CFD; mixing; nozzle; nucleation; steam condensation; steam ejector |
ANZSRC Field of Research 2020 | 401213. Turbulent flows |
401204. Computational methods in fluid flow, heat and mass transfer (incl. computational fluid dynamics) | |
401706. Numerical modelling and mechanical characterisation | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | School of Mechanical and Electrical Engineering |
Amirkabir University of Technology, Iran | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q28z8/ejector-primary-nozzle-steam-condensation-area-ratio-effects-and-mixing-layer-development
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