Experimental Investigation on the Spray Behaviour of Bluff Body Air-Assisted Atomizer Designs
This study investigates the gas dynamic effects and atomization behavior of a novel sonic bluff body-assisted two-fluid atomizer with three different geometric configurations based on airflow orifice diameters (d) of 2.0 mm, 3.0 mm, and 4.0 mm. Along with a 280 µm annular liquid sheet, atomizers tha...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-09-01
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| Series: | Fluids |
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| Online Access: | https://www.mdpi.com/2311-5521/7/9/301 |
| _version_ | 1827661132972687360 |
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| author | Raghav Sikka Knut Vågsæther Dag Bjerketvedt Joachim Lundberg |
| author_facet | Raghav Sikka Knut Vågsæther Dag Bjerketvedt Joachim Lundberg |
| author_sort | Raghav Sikka |
| collection | DOAJ |
| description | This study investigates the gas dynamic effects and atomization behavior of a novel sonic bluff body-assisted two-fluid atomizer with three different geometric configurations based on airflow orifice diameters (d) of 2.0 mm, 3.0 mm, and 4.0 mm. Along with a 280 µm annular liquid sheet, atomizers that employed a central bluff body (cone) with 6.0 mm cone distance (L<sub>c</sub>) are compared based on the range of different air and liquid (water) flow rates. The spray-bluff body-impacted secondary atomization was characterized through volume-normalized droplet size distribution (DSD) and cumulative droplet distribution, excentricity plots, Sauter mean diameter (SMD), and relative span factor (Δ). Droplet number density decreases with the increase in radial location, with lesser droplet density for the 3.0 mm atomizer. DSD and cumulative droplet distribution become less uniform with the increase in the radial locations with wider distribution for larger diameter atomizers (4.0 mm). Droplet excentricity follows an inverse relationship with the droplet diameter such that high diameter droplets have low excentricity (%) and vice versa. SMD and relative span factor (RSF) showed opposite trends when plotted (line plots) against the air-to-liquid ratio (ALR) with larger fluctuation in the SMD than the RSF (Δ) value. The spray pattern spread increases gradually with increasing liquid loading and with decreases in the ALR value for all atomizers. |
| first_indexed | 2024-03-10T00:04:14Z |
| format | Article |
| id | doaj.art-599e7c68a1cc48938b27ea659094264c |
| institution | Directory Open Access Journal |
| issn | 2311-5521 |
| language | English |
| last_indexed | 2024-03-10T00:04:14Z |
| publishDate | 2022-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Fluids |
| spelling | doaj.art-599e7c68a1cc48938b27ea659094264c2023-11-23T16:11:41ZengMDPI AGFluids2311-55212022-09-017930110.3390/fluids7090301Experimental Investigation on the Spray Behaviour of Bluff Body Air-Assisted Atomizer DesignsRaghav Sikka0Knut Vågsæther1Dag Bjerketvedt2Joachim Lundberg3Faculty of Technology, Natural Sciences and Maritime Sciences, USN, 3918 Porsgrunn, NorwayFaculty of Technology, Natural Sciences and Maritime Sciences, USN, 3918 Porsgrunn, NorwayFaculty of Technology, Natural Sciences and Maritime Sciences, USN, 3918 Porsgrunn, NorwayFaculty of Technology, Natural Sciences and Maritime Sciences, USN, 3918 Porsgrunn, NorwayThis study investigates the gas dynamic effects and atomization behavior of a novel sonic bluff body-assisted two-fluid atomizer with three different geometric configurations based on airflow orifice diameters (d) of 2.0 mm, 3.0 mm, and 4.0 mm. Along with a 280 µm annular liquid sheet, atomizers that employed a central bluff body (cone) with 6.0 mm cone distance (L<sub>c</sub>) are compared based on the range of different air and liquid (water) flow rates. The spray-bluff body-impacted secondary atomization was characterized through volume-normalized droplet size distribution (DSD) and cumulative droplet distribution, excentricity plots, Sauter mean diameter (SMD), and relative span factor (Δ). Droplet number density decreases with the increase in radial location, with lesser droplet density for the 3.0 mm atomizer. DSD and cumulative droplet distribution become less uniform with the increase in the radial locations with wider distribution for larger diameter atomizers (4.0 mm). Droplet excentricity follows an inverse relationship with the droplet diameter such that high diameter droplets have low excentricity (%) and vice versa. SMD and relative span factor (RSF) showed opposite trends when plotted (line plots) against the air-to-liquid ratio (ALR) with larger fluctuation in the SMD than the RSF (Δ) value. The spray pattern spread increases gradually with increasing liquid loading and with decreases in the ALR value for all atomizers.https://www.mdpi.com/2311-5521/7/9/301sonic atomizersSauter mean diameterdroplet size distributionpatternationhigh-speed flow dynamics |
| spellingShingle | Raghav Sikka Knut Vågsæther Dag Bjerketvedt Joachim Lundberg Experimental Investigation on the Spray Behaviour of Bluff Body Air-Assisted Atomizer Designs Fluids sonic atomizers Sauter mean diameter droplet size distribution patternation high-speed flow dynamics |
| title | Experimental Investigation on the Spray Behaviour of Bluff Body Air-Assisted Atomizer Designs |
| title_full | Experimental Investigation on the Spray Behaviour of Bluff Body Air-Assisted Atomizer Designs |
| title_fullStr | Experimental Investigation on the Spray Behaviour of Bluff Body Air-Assisted Atomizer Designs |
| title_full_unstemmed | Experimental Investigation on the Spray Behaviour of Bluff Body Air-Assisted Atomizer Designs |
| title_short | Experimental Investigation on the Spray Behaviour of Bluff Body Air-Assisted Atomizer Designs |
| title_sort | experimental investigation on the spray behaviour of bluff body air assisted atomizer designs |
| topic | sonic atomizers Sauter mean diameter droplet size distribution patternation high-speed flow dynamics |
| url | https://www.mdpi.com/2311-5521/7/9/301 |
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