年間 12 号発行
ISSN 印刷: 1044-5110
ISSN オンライン: 1936-2684
Indexed in
EFFERVESCENT ATOMIZATION OF POLYVINYLPYRROLIDONE SOLUTIONS: INFLUENCE OF LIQUID PROPERTIES AND ATOMIZER GEOMETRY ON LIQUID BREAKUP AND SPRAY CHARACTERISTICS
要約
An effervescent atomizer is a special type of internal mixing pneumatic atomizer with significantly reduced atomization gas consumption compared to conventional pneumatic atomizers. The influence of the mass fraction of polyvinylpyrrolidone (PVP) K30 in aqueous solutions and the influence of nozzle orifice length on the spray have been investigated. The breakup of PVP K30 solutions is changed significantly by their viscosity, which depends on the mass fraction. With increasing viscosity, the breakup changes from complete breakup into drops directly at the nozzle orifice outlet to an incomplete breakup with ligaments present. The corresponding Sauter mean diameter and the standard deviation s2 (representing the width of the drop size distribution) increase with increasing viscosity as well. The air-to-liquid ratio by mass (ALR) has comparably less impact on the breakup at the nozzle orifice outlet. Nevertheless an increasing ALR results in decreasing Sauter mean diameters and standard deviations s2. The atomizer geometry has minor impact on the breakup and the resulting drop size distribution. The unsteadiness of the spray was quantified by its pulsation frequency. Comparing Sauter mean diameters and standard deviations s2 with the corresponding pulsation frequencies of the spray indicates that an increase in pulsation frequency correlates with a reduction of both characteristic values and leads accordingly to a steadier spray. The pulsation frequency can be slightly controlled by the atomizer geometry. The effect of the pulsation frequency on Sauter mean diameter and standard deviation s2 is less distinct than the effect of ALR and mass fraction.
-
Hong Moongeun, Fleck Brian A., Nobes David S., Unsteadiness of the internal flow in an effervescent atomizer nozzle, Experiments in Fluids, 55, 12, 2014. Crossref
-
Stähle Philipp, Gaukel Volker, Schuchmann Heike P., Comparison of an Effervescent Nozzle and a Proposed Air-Core-Liquid-Ring (ACLR) Nozzle for Atomization of Viscous Food Liquids at Low Air Consumption, Journal of Food Process Engineering, 40, 1, 2017. Crossref
-
Stähle Philipp, Schuchmann Heike P., Gaukel Volker, Performance and Efficiency of Pressure-Swirl and Twin-Fluid Nozzles Spraying Food Liquids with Varying Viscosity, Journal of Food Process Engineering, 40, 1, 2017. Crossref
-
Stähle Philipp, Gaukel Volker, Schuchmann Heike P., Investigation on the Applicability of the Effervescent Atomizer in Spray Drying of Foods: Influence of Liquid Viscosity on Nozzle Internal Two-Phase Flow and Spray Characteristics, Journal of Food Process Engineering, 38, 5, 2015. Crossref
-
Yousefifard M., Ghadimi P., Nowruzi H., Numerical investigation of the effects of chamber backpressure on HFO spray characteristics, International Journal of Automotive Technology, 16, 2, 2015. Crossref
-
Günther Astrid, Lampa Aljoscha, Fritsching Udo, Schröder Jewe, Kleinhans Agnes, Gaukel Volker, Schuchmann Heike P., Loth Jan-Martin, Petermann Marcus, Wirth Karl-Ernst, Benchmarking of Gas-Assisted Atomization Systems for Liquid Disintegration, Chemical Engineering & Technology, 39, 4, 2016. Crossref
-
Kleinhans Agnes, Georgieva Kostadinka, Wagner Moritz, Gaukel Volker, Schuchmann Heike P., On the characterization of spray unsteadiness and its influence on oil drop breakup during effervescent atomization, Chemical Engineering and Processing: Process Intensification, 104, 2016. Crossref
-
Kourmatzis A., Lowe A., Masri A.R., Combined effervescent and airblast atomization of a liquid jet, Experimental Thermal and Fluid Science, 75, 2016. Crossref
-
Kleinhans Agnes, Schröder Jewe, Stähle Philipp, Gaukel Volker, Schuchmann Heike P., Investigation on the Usage of Effervescent Atomization for Spraying and Spray Drying of Rheological Complex Food Liquids and on the Resulting Particle and Product Properties, in Process-Spray, 2016. Crossref
-
Klaiber Michael J., Wang Zhe, Simon Sven, A Real-Time Process Analysis System for the Simultaneous Acquisition of Spray Characteristics, in Process-Spray, 2016. Crossref
-
Oswald Walter, Lauk Jan, Gödeke Lutz, Ehrhard Peter, Willenbacher Norbert, Analysis of Paint Flow Pulsations during High-Speed Rotary Bell Atomization, Coatings, 9, 10, 2019. Crossref
-
Jedelský Jan, Zaremba Matouš, Malý Milan, Jícha Miroslav, Vít Tomáš, Dančová Petra, Novotný Petr, Characteristics of droplet motion in effervescent sprays, EPJ Web of Conferences, 67, 2014. Crossref
-
Hammad Farid A., Sun Kai, Jedelsky Jan, Wang Tianyou, The Effect of Geometrical, Operational, Mixing Methods, and Rheological Parameters on Discharge Coefficients of Internal-Mixing Twin-Fluid Atomizers, Processes, 8, 5, 2020. Crossref
-
Stähle P., Gaukel V., Schuchmann H.P., Influence of feed viscosity on the two-phase flow inside the exit orifice of an effervescent atomizer and on resulting spray characteristics, Food Research International, 77, 2015. Crossref
-
Kourmatzis A., Lowe A., Masri A. R., Conditioned Analysis of Effervescent Atomization, Journal of Energy Engineering, 143, 5, 2017. Crossref
-
Li Genbao, Li Chuqiao, Experimental study on the spray steadiness of an internal-mixing twin-fluid atomizer, Energy, 226, 2021. Crossref