Analysis of Flow Evolution and Thermal Instabilities in the Near-Nozzle Region of a Free Plane Laminar Jet
Joint Authors
Ramírez-León, Hermilo
Couder-Castañeda, Carlos
Barrios-Piña, Hector
Source
Mathematical Problems in Engineering
Issue
Vol. 2015, Issue 2015 (31 Dec. 2015), pp.1-11, 11 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2015-01-01
Country of Publication
Egypt
No. of Pages
11
Main Subjects
Abstract EN
This work focuses on the evolution of a free plane laminar jet in the near-nozzle region.
The jet is buoyant because it is driven by a continuous addition of both buoyancy and momentum at the source.
Buoyancy is given by a temperature difference between the jet and the environment.
To study the jet evolution, numerical simulations were performed for two Richardson numbers: the one corresponding to a temperature difference slightly near the validity of the Boussinesq approximation and the other one corresponding to a higher temperature difference.
For this purpose, a time dependent numerical model is used to solve the fully dimensional Navier-Stokes equations.
Density variations are given by the ideal gas law and flow properties as dynamic viscosity and thermal conductivity are considered nonconstant.
Particular attention was paid to the implementation of the boundary conditions to ensure jet stability and flow rates control.
The numerical simulations were also reproduced by using the Boussinesq approximation to find out more about its pertinence for this kind of flows.
Finally, a stability diagram is also obtained to identify the onset of the unsteady state in the near-nozzle region by varying control parameters of momentum and buoyancy.
It is found that, at the onset of the unsteady state, momentum effects decrease almost linearly when buoyancy effects increase.
American Psychological Association (APA)
Barrios-Piña, Hector& Ramírez-León, Hermilo& Couder-Castañeda, Carlos. 2015. Analysis of Flow Evolution and Thermal Instabilities in the Near-Nozzle Region of a Free Plane Laminar Jet. Mathematical Problems in Engineering،Vol. 2015, no. 2015, pp.1-11.
https://search.emarefa.net/detail/BIM-1074970
Modern Language Association (MLA)
Barrios-Piña, Hector…[et al.]. Analysis of Flow Evolution and Thermal Instabilities in the Near-Nozzle Region of a Free Plane Laminar Jet. Mathematical Problems in Engineering No. 2015 (2015), pp.1-11.
https://search.emarefa.net/detail/BIM-1074970
American Medical Association (AMA)
Barrios-Piña, Hector& Ramírez-León, Hermilo& Couder-Castañeda, Carlos. Analysis of Flow Evolution and Thermal Instabilities in the Near-Nozzle Region of a Free Plane Laminar Jet. Mathematical Problems in Engineering. 2015. Vol. 2015, no. 2015, pp.1-11.
https://search.emarefa.net/detail/BIM-1074970
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1074970