スギモト タケシ   Sugimoto Takeshi
  杉本 剛
   所属   神奈川大学  工学部 情報システム創成学科
    神奈川大学大学院  工学研究科 工学専攻(情報システム創成領域)
   職種   教授
言語種別 日本語
発行・発表の年月 2010/09
形態種別 その他
標題 Solving the paradox about the avian pulmonary system
執筆形態 単著
掲載誌名 EuroMech Fluid Mechanics Conference 8
巻・号・頁 Abstracts,S11-11頁
概要 Birds have special lungs augmented by several air sacs. The direction of the air flow in the parabronchi is against the direction of the pulmonary circulation; this configuration was once thought to constitute the counter-current relation responsible for high efficiency of gas-exchange in birds, but this hypothesis was disproved by the experiments. The counter-current model was replaced by the cross-current model: the direction of the blood flows is perpendicular to the direction of the air flows in the parabronchi. This model, however, does not match the anatomical evidence: the direction of the blood flows is not transverse to the direction of the air flows. To solve this discrepancy the new proposal is made based on the state equation of gases. This theory consists of two fold mechanisms: one is the radial-central counter gas-exchange configuration for the process between the air and blood capillaries; another is for the process of oxygen accumulation in the pulmonary veins. The new mathematical treatment is constructed by Fick's, Darcy's and Dalton's laws. The basic equations are solved analytically. The counter gas-exchange accounts for high efficiency in the avian pulmonary system, while the oxygen accumulation accounts for the experimental results without assuming the cross-current model.