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J Appl Physiol (November 3, 2005). doi:10.1152/japplphysiol.01049.2005
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Submitted on August 29, 2005
Accepted on October 27, 2005

Physical stresses at the air-wall interface of the human nasal cavity during breathing

David Elad1*, Sara Naftali1, Moshe Rosenfeld2, and Michael Wolf3

1 Department of Biomedical Engineering, Tel Aviv University, Tel Aviv, Israel; Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
2 Department of Fluid Mechanics, Tel Aviv University, Tel Aviv, Israel
3 Department of Otorhinolaryngology, The Chaim Sheba Medical Center, Tel Hashomer, Israel

* To whom correspondence should be addressed. E-mail: elad{at}eng.tau.ac.il.

The nose is the front line defender of the respiratory system and is rich with mechano-receptors, thermo-receptors and nerve endings. A time dependent computational model of transport through nasal models of a healthy human has been used to analyze the fields of physical stresses that may develop at the air-wall interface of the nasal mucosa. Simulations during quiet breathing revealed wall shear stresses as high as 0.3 Pa in the nose-like model and 1.5 Pa in the anatomical model. These values are of the same order of those known to exist in uniform large arteries. The distribution of temperature near the nasal wall at peak inspiration is similar to that of wall shear stresses. The lowest temperatures occur in the vicinity of high stresses due to the narrow passageway in these locations. Time and spatial gradients of these stresses may have functional effects on nasal sensation of airflow and may play a role in the well being of nasal breathing.




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