Airflow resistance of airflow-regulating devices described by independent coefficients

G.J. Verkerke*, A.A. Geertsema, H.K. Schutte

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

12 Citations (Scopus)


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
Issue number7 I
Publication statusPublished - 1 Jan 2001
Externally publishedYes


  • Airflow resistance
  • Heat and moisture exchange filter
  • Laryngectomy
  • Pressure drop
  • Shunt valve
  • Tracheostoma valve


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