| 1. |
- Altimira, Mireia, 1981-, et al.
(författare)
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Characterization of fan spray atomizers through numerical simulation
- 2009
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Ingår i: International Journal of Heat and Fluid Flow. - : Elsevier. - 0142-727X .- 1879-2278. ; 30:2, s. 339-355
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Tidskriftsartikel (refereegranskat)abstract
- The present paper focuses on the mathematical modeling of industrial fan spray atomizers. The two-phase flow taking place inside the nozzle's tip and the exterior region near the outlet of three different industrial nozzle designs has been modeled and simulated. As a result, valuable information has been obtained regarding the influence of the inner geometry on the flow and also the formation and development of the liquid sheet. Characteristic magnitudes such as the discharge coefficient and the liquid sheet thickness factor have been obtained and validated through experimental measurements. The accumulation of liquid at the border of fan-shaped liquid sheets, also known as rim, has been studied in the analyzed designs, revealing the presence of a tangential velocity component in the liquid sheet and a relationship between the incoming flow rate of the rim and the angle of the liquid sheet. The dependence of the results on turbulence modeling has also been analyzed, drawing interesting conclusions regarding their influence on the liquid sheet mean flow characteristics and on the surrounding gas. Thus, the mathematical model developed has been proved to be a useful tool for nozzle manufacturers; it provides the most important characteristic parameters of the liquid sheet formed given certain nozzle geometry and, additionally, those data necessary to carry out studies of instability, breakup and atomization of the liquid sheet.
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| 2. |
- Altimira, Mireia, 1981-, et al.
(författare)
-
Fan-Spray Atomizers Analysis through Mathematical Modeling
- 2007
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Ingår i: Proceedings of the 21st ILASS - Europe Meeting 2007.
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Konferensbidrag (refereegranskat)abstract
- The main objective of this work is to determine the most important design parameters in fan spray atomizers and their effect in the atomization features in order to provide a design tool for nozzle manufacturers. A mathematical model relating the geometry and operating conditions to the characteristics of the spray has been obtained and validated. Three different sub-models have been used in series, so that the results of one model become inputs of the next one, namely multiphase flow simulation, instability and break-up model and maximum entropy model. These have been joined achieving a global model of the whole primary atomization process.
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| 3. |
- Rivas, Alejandro, et al.
(författare)
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Analysis of Liquid-Gas Flow near a Fan-Spray Nozzle Outlet
- 2006
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Ingår i: Conference on Modelling Fluid Flow (CMFF’06).
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Konferensbidrag (refereegranskat)abstract
- This paper reports the results of mathematical modelling and simulation of two-phase flow near the outlet of six different industrial fan-spray atomizers under different operating conditions. The Finite Volume Method, implemented in the commercial code, Fluent V.6.2, has been used to solve the mathematical model numerically, whilst the Volume of Fluid (VOF) approach has been employed to track the interface between liquid and gas. Surface tension effects have been included using the Continuum Surface Force method (CSF). Results from simulation have been validated with experimental data and compared with those from previous works. Interesting conclusions about sheet thickness, velocity and vorticity of the flow have been obtained; some of them differ from hypotheses assumed in previous works. These conclusions may reflect the way in which break-up models are used to obtain drop size and break-up length.
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