RT Journal Article
SR Electronic
T1 The History and Physics of Heliox
JF Respiratory Care
FD American Association for Respiratory Care
SP 608
OP 612
VO 51
IS 6
A1 Dean R Hess
A1 James B Fink
A1 Shekhar T Venkataraman
A1 IN K Kim
A1 Timothy R Myers
A1 Benoit D Tano
YR 2006
UL http://rc.rcjournal.com/content/51/6/608.abstract
AB Since the discovery of helium in 1868, it has found numerous applications in industry and medicine. Its low density makes helium potentially valuable in respiratory care applications, to reduce work of breathing, improve distribution of ventilation, reduce minute volume requirement, and improve aerosol delivery. This review includes a brief history of the use of heliox (a mixture of helium and oxygen) and addresses issues related to the physics of gas flow when heliox is used. Specifically covered are the Hagen-Poiseuille equation, laminar versus turbulent flow, the Reynolds number, orifice flow, Bernoulli's principle, Graham's law, wave speed, and thermal conductivity.