RESPIRATION SYSTEM HEAT EXCHANGE WITH EMPHASIS ON THE TRACHEAL REGION.
NAVAL AIR DEVELOPMENT CENTER JOHNSVILLE PA AEROSPACE CREW EQUIPMENT DEPT
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In order to measure details of respiratory heat exchange in the trachea of the dog, temperature probes with three sensors were positioned at four axial locations. The recorded inspiration temperatures, in conjunction with the assumed symmetrical nature of the flow, produced inspiratory temperature profiles for various respiration conditions and various gases. Based upon measurements obtained from three of the dogs, tracheal inspiration profiles show undeveloped entrance conditions and the developing nature of the flow along the axial direction. Tracheal wall probes indicate a cooler than body core temperature condition, which could effect the cooling of expired gases returning from the warmer lung region. Dry air and helium gas tests produced similar results. Saturated air tests indicated a lesser mid-stream to wall temperature differential, which is believed to be a result of coupling effects between the energy and mass transfer equations. Author
- Anatomy and Physiology