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Computational simulation of temperature and velocity distribution in human upper respiratory airway during inhalation of hot air

Goodarzi Ardakani, V ; Sharif University of Technology | 2016

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  1. Type of Document: Article
  2. DOI: 10.1016/j.resp.2016.01.001
  3. Publisher: Elsevier , 2016
  4. Abstract:
  5. The present study provides an accurate simulation of velocity and temperature distributions of inhalation thermal injury in a human upper airway, including vestibule, nasal cavity, paranasal sinuses, nasopharynx, oropharynx, larynx, and upper part of main bronchus. To this end, a series of CT scan images, taken from an adult woman, was used to construct a three dimensional model. The airway walls temperature was adjusted according to existing in vivo temperature measurements. Also, in order to cover all breathing activities, five different breathing flow rates (10, 15, 20, 30, and 40. l/min) and different ambient air temperatures (100, 200, 300, 400, and 500. °C) were studied. Different flow regimes, including laminar, transitional, and turbulence were considered and the simulations were validated using reliable experimental data. The results show that nostrils, vestibule, and nasal cavity are damaged more than other part of airway. Finally, In order to obtain the heat flux through the walls, correlations for Nusselt number for each individual parts of airway (vestibule, main upper airway, nasopharynx etc.,) are proposed. © 2016 Elsevier B.V
  6. Keywords:
  7. CFD ; Heat flux ; Hot air ; Human respiratory airway ; Inhalation thermal injury ; Temperature ; Adult ; Air ; Air conditioning ; Air temperature ; Airflow ; Ambient air ; Article ; Breathing ; Breathing rate ; Burn ; Computer assisted tomography ; Computer simulation ; Female ; Flow rate ; Heat transfer ; Hot air ; Human ; Human experiment ; In vivo study ; Inhalation ; Larynx ; Main bronchus ; Nasopharynx ; Normal human ; Nose cavity ; Oropharynx ; Paranasal sinus ; Priority journal ; Temperature ; Temperature measurement ; Thermal conductivity ; Thermal injury ; Upper respiratory tract ; Velocity ; Whole body scanner
  8. Source: Respiratory Physiology and Neurobiology ; Volume 223 , 2016 , Pages 49-58 ; 15699048 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S1569904816300015