Experimental Study of Primary Atomization Characteristics of Sonic Air-Assist Atomizers

The present study compares two twin-fluid atomizer concepts based on the airflow (shock waves) pattern obtained through shadowgraph imaging for atomization of water with a low air/water pressure supply. The research work was conducted using the backlight imaging technique for converging (sonic) and...

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Autores principales:	Raghav Sikka, Knut Vågsæther, Dag Bjerketvedt, Joachim Lundberg
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	sonic air-assist atomizers sheet breakup breakup morphology annular sheet Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/9ae414c4a50a46c2a760a6d661871c70
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id	oai:doaj.org-article:9ae414c4a50a46c2a760a6d661871c70
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spelling	oai:doaj.org-article:9ae414c4a50a46c2a760a6d661871c702021-11-11T15:24:15ZExperimental Study of Primary Atomization Characteristics of Sonic Air-Assist Atomizers10.3390/app1121104442076-3417https://doaj.org/article/9ae414c4a50a46c2a760a6d661871c702021-11-01T00:00:00Zhttps://www.mdpi.com/2076-3417/11/21/10444https://doaj.org/toc/2076-3417The present study compares two twin-fluid atomizer concepts based on the airflow (shock waves) pattern obtained through shadowgraph imaging for atomization of water with a low air/water pressure supply. The research work was conducted using the backlight imaging technique for converging (sonic) and converging–diverging (supersonic) air-assist atomizers with a 3.0 mm (throat) diameter. An annular sheet of thicknesses 70 µm and 280 µm with a high-speed air-core was employed to study the breakup dynamics for different water mass flow rates (100–350 kg/h) and air mass flow rates (5–35 kg/h). Different sheet breakup patterns were identified as the function of the ALR ratio (air-to-liquid mass flow), liquid Weber number (<sub>WeL</sub>), and Reynolds number (Reg). Different breakup modes extend from canonical Rayleigh bubble breakup, ligament-type breakup, to the pure pulsating breakup via annular sheet disintegration. The sheet breakup dynamics were studied in terms of spray angle and breakup length. With higher ALR values, breakup length showed a decreasing trend, while spray angle showed an increasing trend in the converging and converging–diverging (CD) air-assist atomizers, respectively, owing to the drastic difference in the jet flow dynamics.Raghav SikkaKnut VågsætherDag BjerketvedtJoachim LundbergMDPI AGarticlesonic air-assist atomizerssheet breakupbreakup morphologyannular sheetTechnologyTEngineering (General). Civil engineering (General)TA1-2040Biology (General)QH301-705.5PhysicsQC1-999ChemistryQD1-999ENApplied Sciences, Vol 11, Iss 10444, p 10444 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	sonic air-assist atomizers sheet breakup breakup morphology annular sheet Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
spellingShingle	sonic air-assist atomizers sheet breakup breakup morphology annular sheet Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999 Raghav Sikka Knut Vågsæther Dag Bjerketvedt Joachim Lundberg Experimental Study of Primary Atomization Characteristics of Sonic Air-Assist Atomizers
description	The present study compares two twin-fluid atomizer concepts based on the airflow (shock waves) pattern obtained through shadowgraph imaging for atomization of water with a low air/water pressure supply. The research work was conducted using the backlight imaging technique for converging (sonic) and converging–diverging (supersonic) air-assist atomizers with a 3.0 mm (throat) diameter. An annular sheet of thicknesses 70 µm and 280 µm with a high-speed air-core was employed to study the breakup dynamics for different water mass flow rates (100–350 kg/h) and air mass flow rates (5–35 kg/h). Different sheet breakup patterns were identified as the function of the ALR ratio (air-to-liquid mass flow), liquid Weber number (<sub>WeL</sub>), and Reynolds number (Reg). Different breakup modes extend from canonical Rayleigh bubble breakup, ligament-type breakup, to the pure pulsating breakup via annular sheet disintegration. The sheet breakup dynamics were studied in terms of spray angle and breakup length. With higher ALR values, breakup length showed a decreasing trend, while spray angle showed an increasing trend in the converging and converging–diverging (CD) air-assist atomizers, respectively, owing to the drastic difference in the jet flow dynamics.
format	article
author	Raghav Sikka Knut Vågsæther Dag Bjerketvedt Joachim Lundberg
author_facet	Raghav Sikka Knut Vågsæther Dag Bjerketvedt Joachim Lundberg
author_sort	Raghav Sikka
title	Experimental Study of Primary Atomization Characteristics of Sonic Air-Assist Atomizers
title_short	Experimental Study of Primary Atomization Characteristics of Sonic Air-Assist Atomizers
title_full	Experimental Study of Primary Atomization Characteristics of Sonic Air-Assist Atomizers
title_fullStr	Experimental Study of Primary Atomization Characteristics of Sonic Air-Assist Atomizers
title_full_unstemmed	Experimental Study of Primary Atomization Characteristics of Sonic Air-Assist Atomizers
title_sort	experimental study of primary atomization characteristics of sonic air-assist atomizers
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/9ae414c4a50a46c2a760a6d661871c70
work_keys_str_mv	AT raghavsikka experimentalstudyofprimaryatomizationcharacteristicsofsonicairassistatomizers AT knutvagsæther experimentalstudyofprimaryatomizationcharacteristicsofsonicairassistatomizers AT dagbjerketvedt experimentalstudyofprimaryatomizationcharacteristicsofsonicairassistatomizers AT joachimlundberg experimentalstudyofprimaryatomizationcharacteristicsofsonicairassistatomizers
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Experimental Study of Primary Atomization Characteristics of Sonic Air-Assist Atomizers

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