The calculation of entrance length in physiological flow

descriptionPublicationkeyboard_double_arrow_right Article 01 Jul 1975 English Publisher:Springer Science and Business Media LLCJournal:Medical & Biological Engineering, volume 13, pages 558-560 (issn: 0025-696X, eissn: 1741-0444,

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Authors: E, Kassianides; J H, Gerrard;

doi: 10.1007/bf02477135

pmid: 1195856

The calculation of entrance length in physiological flow

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Abstract

Entrance length is proportional to the square of the thickness δ of the oscillating boundary layer on the walls of the tube. Values of δ calculated for a rigid tube of circular cross-section are presented. Entrance length is important because of the multiple branching of the vascular network. The entrance length is defined as that distance from the entrance to a tube in which the flow becomes fully established to within a small fraction, the same fraction is used in the definition of δ. Values for fractions of 1–0·1% are given.

Related Organizations

University of Manchester
United Kingdom
University of Manchester
United Kingdom

Keywords

Biophysics, Pulmonary Ventilation, Biophysical Phenomena, Blood Flow Velocity

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