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Stability criterion of a laminar flow

Aivazyan, O. M.

Conclusions 1. During flow in pipes roughness affects the hydraulic resistance coefficient in the entire laminar region. Relation (8) and other theoretical relations of laminar flow in pipes are valid only for smooth pipes. 2. The lower critical value of the Reynolds number varies in wide limits depending on the pipe roughness. Its generally accepted value (1) is not universal and is valid only for smooth pipes. 3. An energy criterion (18) was established, the lower critical of which (20), just as the lower critical values (25), (28), (32) of its modifications, determining the moment of the loss of stability by laminar flow, are universal for pipes with various roughness.

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Stability criterion of a laminar flow

Aivazyan, O. M.

Conclusions 1. During flow in pipes roughness affects the hydraulic resistance coefficient in the entire laminar region. Relation (8) and other theoretical relations of laminar flow in pipes are valid only for smooth pipes. 2. The lower critical value of the Reynolds number varies in wide limits depending on the pipe roughness. Its generally accepted value (1) is not universal and is valid only for smooth pipes. 3. An energy criterion (18) was established, the lower critical of which (20), just as the lower critical values (25), (28), (32) of its modifications, determining the moment of the loss of stability by laminar flow, are universal for pipes with various roughness.

Stability criterion of a laminar flow

Aivazyan, O. M.

Conclusions 1. During flow in pipes roughness affects the hydraulic resistance coefficient in the entire laminar region. Relation (8) and other theoretical relations of laminar flow in pipes are valid only for smooth pipes. 2. The lower critical value of the Reynolds number varies in wide limits depending on the pipe roughness. Its generally accepted value (1) is not universal and is valid only for smooth pipes. 3. An energy criterion (18) was established, the lower critical of which (20), just as the lower critical values (25), (28), (32) of its modifications, determining the moment of the loss of stability by laminar flow, are universal for pipes with various roughness.

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Title:

Stability criterion of a laminar flow

Contributors:

Aivazyan, O. M. (author)

Published in:

Hydrotechnical Construction ; 19 ; 661-671

Publication date:

1985-12-01

Size:

11 pages

ISSN:

1570-1468 , 0018-8220

DOI:

https://doi.org/10.1007/BF01435435

Type of media:

Article (Journal)

Type of material:

Electronic Resource

Language:

English

Keywords:

Reynolds Number , Energy Source , Power Generation , Laminar Flow , Power Engineer Engineering , Energy Technology , Power Electronics, Electrical Machines and Networks , Renewable and Green Energy , Geoengineering, Foundations, Hydraulics

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