Why do we have a bronchial tree with 23 levels of bifurcation?

Akira Nakayama, Fujio Kuwahara, Yoshihiko Sano

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

A simple one-dimensional mass transfer model has been proposed for the oxygen transport through a bronchial tree to alveolar tissues as well as the carbon dioxide removal from the tissues in the human respiratory system. The proposed model mathematically describes the mass transfer between the airway inlet and the red blood cell interior in the pulmonary capillaries. The quasi steady one-dimensional analysis based on the model reveals that the bronchial tree is constructed such that it promotes the easiest access to the external air. Naturally, there exists the optimal number of the bifurcation levels, namely, 23, that yields the minimum overall mass transfer resistance for the mass transport from the external air to the red blood cells.

Original languageEnglish
Pages (from-to)351-354
Number of pages4
JournalHeat and Mass Transfer/Waerme- und Stoffuebertragung
Volume45
Issue number3
DOIs
Publication statusPublished - Jan 2009
Externally publishedYes

Fingerprint

mass transfer
Mass transfer
erythrocytes
carbon dioxide removal
respiratory system
Blood
air
dimensional analysis
Cells
Tissue
Respiratory system
Air
Carbon Dioxide
Carbon dioxide
oxygen
Oxygen

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Fluid Flow and Transfer Processes

Cite this

Why do we have a bronchial tree with 23 levels of bifurcation? / Nakayama, Akira; Kuwahara, Fujio; Sano, Yoshihiko.

In: Heat and Mass Transfer/Waerme- und Stoffuebertragung, Vol. 45, No. 3, 01.2009, p. 351-354.

Research output: Contribution to journalArticle

Nakayama, Akira ; Kuwahara, Fujio ; Sano, Yoshihiko. / Why do we have a bronchial tree with 23 levels of bifurcation?. In: Heat and Mass Transfer/Waerme- und Stoffuebertragung. 2009 ; Vol. 45, No. 3. pp. 351-354.
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