Detail publikačního výsledku

Gas-phase velocity estimation in practical sprays by Phase-Doppler technique

RÁCZ, E.; MALÝ, M.; JEDELSKÝ, J.; JÓZSA, V.

Originální název

Gas-phase velocity estimation in practical sprays by Phase-Doppler technique

Anglický název

Gas-phase velocity estimation in practical sprays by Phase-Doppler technique

Druh

Článek WoS

Originální abstrakt

Practical sprays are characterized by a two-way coupling between droplets and the surrounding gas. The effect of sprays on process performance is critical in numerous applications; hence, the gas-phase velocity is often esti-mated via two methods, using Phase Doppler measurement data. The first one is using a rule of thumb, i.e., estimating the gas-phase velocity by analyzing droplet sizes below a few micrometers. The second way of esti-mating the Stokes number, Stk, is using a threshold well below unity, such as 0.1. There are numerous definitions available in the literature for Stk, resulting in several magnitudes difference. These complex problems are resolved in this paper in the following way. A new definition for Stk is provided, which is sufficiently robust for, e.g., pressure and twin-fluid atomizers. According to the results, the Stk < 0.1 threshold means droplet sizes between 2 and 10 micrometers above 10 m/s gas-phase velocities. Filtering for too small droplets could lead to biased characteristics, especially in estimating the turbulent properties. Hence, the gas-phase velocity estimation is a function of the measurement setup and has a significant spatial dependence. The reader can find the software code online and the algorithm in Appendix A.

Anglický abstrakt

Practical sprays are characterized by a two-way coupling between droplets and the surrounding gas. The effect of sprays on process performance is critical in numerous applications; hence, the gas-phase velocity is often esti-mated via two methods, using Phase Doppler measurement data. The first one is using a rule of thumb, i.e., estimating the gas-phase velocity by analyzing droplet sizes below a few micrometers. The second way of esti-mating the Stokes number, Stk, is using a threshold well below unity, such as 0.1. There are numerous definitions available in the literature for Stk, resulting in several magnitudes difference. These complex problems are resolved in this paper in the following way. A new definition for Stk is provided, which is sufficiently robust for, e.g., pressure and twin-fluid atomizers. According to the results, the Stk < 0.1 threshold means droplet sizes between 2 and 10 micrometers above 10 m/s gas-phase velocities. Filtering for too small droplets could lead to biased characteristics, especially in estimating the turbulent properties. Hence, the gas-phase velocity estimation is a function of the measurement setup and has a significant spatial dependence. The reader can find the software code online and the algorithm in Appendix A.

Klíčová slova

atomization; Phase Doppler; velocity; Stokes number; droplet; spray

Klíčová slova v angličtině

atomization; Phase Doppler; velocity; Stokes number; droplet; spray

Autoři

RÁCZ, E.; MALÝ, M.; JEDELSKÝ, J.; JÓZSA, V.

Rok RIV

2023

Vydáno

01.12.2022

Nakladatel

PERGAMON-ELSEVIER SCIENCE LTD

Místo

OXFORD

ISSN

0301-9322

Periodikum

INTERNATIONAL JOURNAL OF MULTIPHASE FLOW

Svazek

157

Číslo

1

Stát

Spojené království Velké Británie a Severního Irska

Strany od

1

Strany do

14

Strany počet

14

URL

https://www.sciencedirect.com/science/article/pii/S0301932222002324?via%3Dihub

BibTex

@article{BUT180302,
  author="Erika {Rácz} and Milan {Malý} and Jan {Jedelský} and Viktor {Józsa}",
  title="Gas-phase velocity estimation in practical sprays by Phase-Doppler technique",
  journal="INTERNATIONAL JOURNAL OF MULTIPHASE FLOW",
  year="2022",
  volume="157",
  number="1",
  pages="1--14",
  doi="10.1016/j.ijmultiphaseflow.2022.104260",
  issn="0301-9322",
  url="https://www.sciencedirect.com/science/article/pii/S0301932222002324?via%3Dihub"
}