Publication detail

Visualization of the flow of micrometre-sized glass fibres in a replica of the human trachea

LÍZAL, F. MALÝ, M. CABALKA, M. LÍZALOVÁ ŠUJANSKÁ, E. FARKAS, Á. ŠTARHA, P. KEDAJOVÁ, K. MIŠÍK, O. PECH, O. JEDELSKÝ, J. JÍCHA, M.

Original Title

Visualization of the flow of micrometre-sized glass fibres in a replica of the human trachea

English Title

Visualization of the flow of micrometre-sized glass fibres in a replica of the human trachea

Language

en

Original Abstract

Inhaled fibres can potentially cause inflammation of the lung tissue and interstitium which, after long-term exposure, may lead to lung cancer, malignant mesothelioma or pulmonary and pleural fibrosis. For risk reduction and correct setting of occupational hygiene regulations, it is important to be able to precisely calculate the fate of inhaled fibres depending on their physical characteristics and inhalation conditions. As there is a lack of experimental data on the orientation of fibres, a new test rig has been assembled for visualization and recording of flowing fibres in a replica of the human trachea. Fibres prepared from regular glass fibres produced commercially for blown thermal insulation have been processed, dispersed and introduced into the glass tube with dimensions of the trachea. Visualization was performed using a powerful LED light and a high-speed camera. Angles of the fibres have been evaluated for six different flowrates and the dependence of the angles on the flow Reynolds number was searched for. The angles of fibres agreed with expected values, i.e. only vertically and horizontally oriented fibres were recorded. However, the number of vertically and horizontally oriented fibres did not seem to be correlated with the flow Reynolds number.

English abstract

Inhaled fibres can potentially cause inflammation of the lung tissue and interstitium which, after long-term exposure, may lead to lung cancer, malignant mesothelioma or pulmonary and pleural fibrosis. For risk reduction and correct setting of occupational hygiene regulations, it is important to be able to precisely calculate the fate of inhaled fibres depending on their physical characteristics and inhalation conditions. As there is a lack of experimental data on the orientation of fibres, a new test rig has been assembled for visualization and recording of flowing fibres in a replica of the human trachea. Fibres prepared from regular glass fibres produced commercially for blown thermal insulation have been processed, dispersed and introduced into the glass tube with dimensions of the trachea. Visualization was performed using a powerful LED light and a high-speed camera. Angles of the fibres have been evaluated for six different flowrates and the dependence of the angles on the flow Reynolds number was searched for. The angles of fibres agreed with expected values, i.e. only vertically and horizontally oriented fibres were recorded. However, the number of vertically and horizontally oriented fibres did not seem to be correlated with the flow Reynolds number.

Keywords

fiber, fibre, aerosol, human lungs, human airways, particle deposition

Released

19.11.2019

Publisher

Experimental Fluid Mechanics 2019

Location

Františkovy Lázně (Franzensbad)

Pages count

4

Documents

BibTex


@inproceedings{BUT161021,
  author="František {Lízal} and Milan {Malý} and Matouš {Cabalka} and Elena {Lízalová Šujanská} and Árpád {Farkas} and Pavel {Štarha} and Kristýna {Kedajová} and Ondrej {Mišík} and Ondřej {Pech} and Jan {Jedelský} and Miroslav {Jícha}",
  title="Visualization of the flow of micrometre-sized glass fibres in a replica of the human trachea",
  annote="Inhaled fibres can potentially cause inflammation of the lung tissue and interstitium which, after long-term exposure, may lead to lung cancer, malignant mesothelioma or pulmonary and pleural fibrosis. For risk reduction and correct setting of occupational hygiene regulations, it is important to be able to precisely calculate the fate of inhaled fibres depending on their physical characteristics and inhalation conditions. As there is a lack of experimental data on the orientation of fibres, a new test rig has been assembled for visualization and recording of flowing fibres in a replica of the human trachea. Fibres prepared from regular glass fibres produced commercially for blown thermal insulation have been processed, dispersed and introduced into the glass tube with dimensions of the trachea. Visualization was performed using a powerful LED light and a high-speed camera. Angles of the fibres have been evaluated for six different flowrates and the dependence of the angles on the flow Reynolds number was searched for. The angles of fibres agreed with expected values, i.e. only vertically and horizontally oriented fibres were recorded. However, the number of vertically and horizontally oriented fibres did not seem to be correlated with the flow Reynolds number.",
  address="Experimental Fluid Mechanics 2019",
  booktitle="Proceedings of the International conference Experimental Fluid Mechanics 2019",
  chapter="161021",
  howpublished="print",
  institution="Experimental Fluid Mechanics 2019",
  year="2019",
  month="november",
  publisher="Experimental Fluid Mechanics 2019"
}