Flow Regimes in Protective Masks.
Abstract
The appearance of a transition from laminar flow to turbulent flow has been discovered in respiratory protective masks when donned by some, but not all, human subjects. The cause of the turbulence in the M17 protective mask has been found to be flow constriction in the nosecup region. It has been mathematically shown that this turbulence reduces the time available for expiration which subsequently causes reduced tolerance time of men working while wearing the mask. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1973
- Accession Number
- AD0758442
Entities
People
- Arthur T. Johnson
- Ceslovas Masaitis
- Thomas M. Micellie