Airflow resistance of airflow-regulating devices described by independent coefficients

GJ Verkerke*, AA Geertsema, HK Schutte

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

12 Citations (Scopus)

Abstract

Rehabilitation after laryngectomy includes more and more the use of airflow-regulating devices such as shunt valves (SVs). tracheostoma valves (TSVs), and heat and moisture exchange (HME) filters. In determining the quality of those devices, airflow resistance is a very important factor. It is currently defined as pressure drop divided by airflow. However, for most applications, this definition does not result in a pressure- and airflow-independent parameter. Therefore, a new set of parameters is defined and applied to pressure-airflow curves of airflow-regulating devices. Pressure drop over TSVs and HME filters appears to have a squared relationship with flow. In SVs, it has a linear relationship. The new set of parameters describes the pressure-airflow relationship properly for all considered devices. In conclusion, theoretical predictions of flow mechanics appear to be valid for SVs, TSVs, and HME filters. Only 2 coefficients are necessary to describe the pressure-flow characteristics of these airflow-regulating devices, independent of pressure drop over and flow through the device.

Original languageEnglish
Pages (from-to)639-645
Number of pages7
JournalAnnals of otology rhinology and laryngology
Volume110
Issue number7
Publication statusPublished - Jul-2001

Keywords

  • airflow resistance
  • heat and moisture exchange filter
  • laryngectomy
  • pressure drop
  • shunt valve
  • tracheostoma valve
  • NIJDAM VOICE PROSTHESIS
  • TRACHEOSTOMA VALVE
  • AERODYNAMIC CHARACTERISTICS
  • LARYNGECTOMIZED PATIENT
  • AIRWAY-RESISTANCE
  • GRONINGEN BUTTON
  • FLOW
  • REHABILITATION
  • DESIGN
  • HEAT

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