Tento projekt je zaměřen na prohloubení znalostí procesu tvorby spreje z dvoumédiových trysek s vnitřním směšováním. Charakter vnitřního proudění, tvorba spreje a parametry kapek budou zkoumány experimentálně (Fázovou Dopplerovskou Anemometrií, vysokorychlostní vizualizací, PIV) a numericky. Práce budou provedeny za použití několika nových modifikací vnitřní geometrie trysky včetně bubble breakerů, srážkové a víceotvorové konfigurace výstupního otvoru v definovaném rozsahu provozních tlaků a hmotnostních poměrů kapaliny a plynu. Tvorba vnitřních bublin bude pozorována a korelována se strukturou rozpadu kapaliny a parametrů spreje. Cílem je snížit velikostní rozptyl generovaných kapek a zvýšit energetickou účinnost trysky. Na základě výstupů projektu bude proces tvorby spreje z optimalizované varianty studován v příčném a protiproudém uspořádání ve větrném tunelu s cílem simulovat podmínky reálné aplikace.

Description in English
The project will focus to advance the understanding of the spraying process of internally mixing twin-fluid atomizers. The character of internal flow, spray formation and droplet parameters will be investigated experimentally (Phase-Doppler Anemometry, High-speed imaging, PIV) and numerically. The works will be provided with several recently introduced modifications of the atomizers internal geometry including bubble breakers, impinging and multi-hole exit orifice configuration at defined range of operation pressures and gas-to-liquid mass ratios. The internal bubble grow will be observed and correlated with the liquid breakup structure and spray parameters. The aim is to reduce the size polydispersity of generated droplets and increase atomizer energy efficiency. Based on the project outcomes, the spray generation of the optimized variant will be studied in cross/counter flow inside a wind tunnel to simulate the conditions of real application.

Keywords
dvoumédiový;atomizér;šumivý;sprej;vnitřní proudění;scrubber

Key words in English
twin-fuid, atomizer, effervescent, spray, internal flow, counter flow, scrubber

23-07722S

Czech

Malý Milan, Ing., Ph.D. - principal person responsible

Energy Institute
- responsible department (31.3.2022 - not assigned)
Energy Institute
- beneficiary (31.3.2022 - not assigned)

Detail

HÁJEK, J.; MALÝ, M.; CEJPEK, O.; JEDELSKÝ, J. Nebulizer Based Devices for Fine Nanoparticle Coating. In Topical Problems of Fluid Mechanics. Topical Problems of Fluid Mechanics ... PRAGUE 8: Acad Sci Czech Republic, Inst Thermomechanics, 2025. p. 91-98.
Detail

CEJPEK, O.; MALÝ, M.; HÁJEK, J.; HÁJEK, O.; BĚLKA, M.; JEDELSKÝ, J. Comparison of droplet dynamics in low-speed gaseous counter flow: Pressure-swirl and twin-fluid spra. Shanghai: ICLASS 2024, 2024. 10 p.
Detail

MALÝ, M.; CEJPEK, O.; HÁJEK, J.; HÁJEK, O.; JEDELSKÝ, J. Effect of bubble-breaker geometry on spray parameters of effervescent atomizer: preliminary study. Shanghai: ICLASS, 2024. p. 1-7.
Detail

KARDOS, R.; RÁCZ, E.; MALÝ, M.; JEDELSKÝ, J.; JÓZSA, V. Detailed spray analysis of airblast atomization of various fuels in a reacting environment. INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 2024, vol. 227, no. 1, p. 1-12. ISSN: 1879-2189.
Detail

MALÝ, M.; CEJPEK, O.; HÁJEK, J.; JEDELSKÝ, J. Ultra-low pressure Effervescent atomizer: droplet size spectra. Seoul: Ilass Asia 2023, 2023. p. 101-102.
Detail

KUMAR, V.; CEJPEK, O.; MALÝ, M.; JEDELSKÝ, J.; AVULAPATI, M. Comprehensive spray characterization of air-assisted impinging jet atomizer for carbon capture applications. INTERNATIONAL JOURNAL OF MULTIPHASE FLOW, 2025, vol. 184, no. 1, p. 1-15. ISSN: 1879-3533.
Detail

MALÝ, M.; CEJPEK, O.; HÁJEK, J.; JEDELSKÝ, J. POD ANALYSIS OF STABLE AND UNSTABLE EFFERVESCENT SPRAY. In Topical Problems of Fluid Mechanics. Topical Problems of Fluid Mechanics ... PRAGUE 8: Acad Sci Czech Republic, Inst Thermomechanics, 2025. p. 167-172.
Detail

Detail

Ondrej Cejpek Milan Maly Miloslav Belka Erika Rácz Jiri Hajek Ondrej Hajek Jan Jedelsky. Spray–gas counterflow interactions in an absorber column. Separation and purification technology, 2026, vol. 382, no. 4, p. 1-16.
Detail

NOVOSAD, P.; MALÝ, M.; CEJPEK, O.; JEDELSKÝ, J. CFD and Experimental Investigation of Multiphase Mixture Formation in Internal-Mixing Twin-Fluid Atomizers. 2025. 1 p.
Detail

PARMAR, G.; MALÝ, M.; CEJPEK, O.; JEDELSKÝ, J.; AVULAPATI, M. Suitability of Air-Assisted atomizers for spray Tower-Based carbon capture. Fuel, 2026, vol. 405, no. 1, p. 1-12.
Detail

CEJPEK, O.; MALÝ, M.; HÁJEK, J.; JEDELSKÝ, J. IMPINGING EFFERVESCENT ATOMIZERS: DESIGN INSIGHTS. In Topical Problems of Fluid Mechanics. Topical Problems of Fluid Mechanics ... PRAGUE 8: Acad Sci Czech Republic, Inst Thermomechanics, 2025. p. 39-44.
Detail

NOVOSAD, P.; MALÝ, M.; CEJPEK, O.; HÁJEK, J.; HÁJEK, O.; JEDELSKÝ, J. Computationally Viable Approach to Twin-Fluid Internal Mixing Atomizer Modeling. In Topical Problems of Fluid Mechanics. Topical Problems of Fluid Mechanics ... PRAGUE 8: Acad Sci Czech Republic, Inst Thermomechanics, 2025. p. 187-194. ISBN: 978-80-87012-05-5.
Detail

Responsibility: Malý Milan, Ing., Ph.D.