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The influence of reynolds number on the entry length and pressure drop for laminar pipe flow
Author(s) -
Dombrowski N.,
Foumeny E. A.,
Ookawara S.,
Riza A.
Publication year - 1993
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450710320
Subject(s) - reynolds number , laminar flow , physics , pressure drop , mechanics , newtonian fluid , geometry , turbulence , mathematics
A numerical analysis of the laminar flow of a Newtonian fluid in the inlet section of a circular pipe has been carried out for a Reynolds number range of 0 to 500, employing a finite element based CFD code. A new flow phenomenon has been identified at low Reynolds numbers (<50), viz, the existence of a peak in the axial pressure profile at a small distance from the entrance. Existing correlations for the entry length are shown to be insufficient and a new correlation for the entry length is proposed.