Accession Number : AD0758442

Title :   Flow Regimes in Protective Masks.

Descriptive Note : Technical rept. May-Jun 72,

Corporate Author : EDGEWOOD ARSENAL MD

Personal Author(s) : Johnson,Arthur T. ; Micellie,Thomas M. ; Masaitis,Ceslovas

Report Date : MAR 1973

Pagination or Media Count : 32

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)

Descriptors :   (*PROTECTIVE MASKS, GAS FLOW), (*RESPIRATION, PROTECTIVE MASKS), TURBULENCE, TOLERANCES(PHYSIOLOGY), EXERCISE(PHYSIOLOGY)

Subject Categories : Protective Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE