Skip to main content
Duke University Libraries
DukeSpace Scholarship by Duke Authors
  • Login
  • Ask
  • Menu
  • Login
  • Ask a Librarian
  • Search & Find
  • Using the Library
  • Research Support
  • Course Support
  • Libraries
  • About
View Item 
  •   DukeSpace
  • Theses and Dissertations
  • Masters Theses
  • View Item
  •   DukeSpace
  • Theses and Dissertations
  • Masters Theses
  • View Item
JavaScript is disabled for your browser. Some features of this site may not work without it.

The Constructal Evolution of the Cross Sections of Jets toward the Round Shape

Thumbnail
View / Download
1.3 Mb
Date
2013
Author
Ziaei, Shiva
Advisors
Bejan, Adrian
Lorente, Sylvie
Repository Usage Stats
286
views
305
downloads
Abstract

This thesis reports a theoretical and experimental study of laminar and turbulent jet flows issuing from a slender rectangular nozzle. According to constructal law of design and evolution in nature, all flow systems have a tendency to evolve into configurations that facilitate flow access over time. Therefore this law predicts that when a jet initially has a flat cross-section, further downstream it would evolve toward round cross-sections for the purpose of enhancing the transfer of momentum (movement) perpendicular to the jet, i.e. to enhance mixing. The first part of the study consists of numerical simulations conducted in range of Re = 10, 20 and 30 for laminar jet flow, and Re = 500, 1000, 2000, 5000 and 10000 for turbulent jet flow, where Re is the Reynolds number based on nozzle spacing and velocity. In the second part, the phenomenon is studied based on scale analysis. The chief conclusions of this part is that the prediction of the transition from flat to round cross-section is in agreement with the results produced by numerical experiments. The experimental observations of jet flows are in accordance with the constructal law.

Type
Master's thesis
Department
Mechanical Engineering and Materials Science
Subject
Mechanical engineering
constructal law
laminar jet
noncircular jet
rectangular jet modeling
turbulent jet
Permalink
https://hdl.handle.net/10161/8800
Citation
Ziaei, Shiva (2013). The Constructal Evolution of the Cross Sections of Jets toward the Round Shape. Master's thesis, Duke University. Retrieved from https://hdl.handle.net/10161/8800.
Collections
  • Masters Theses
More Info
Show full item record
Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 United States License.

Rights for Collection: Masters Theses


Works are deposited here by their authors, and represent their research and opinions, not that of Duke University. Some materials and descriptions may include offensive content. More info

Make Your Work Available Here

How to Deposit

Browse

All of DukeSpaceCommunities & CollectionsAuthorsTitlesTypesBy Issue DateDepartmentsAffiliations of Duke Author(s)SubjectsBy Submit DateThis CollectionAuthorsTitlesTypesBy Issue DateDepartmentsAffiliations of Duke Author(s)SubjectsBy Submit Date

My Account

LoginRegister

Statistics

View Usage Statistics
Duke University Libraries

Contact Us

411 Chapel Drive
Durham, NC 27708
(919) 660-5870
Perkins Library Service Desk

Digital Repositories at Duke

  • Report a problem with the repositories
  • About digital repositories at Duke
  • Accessibility Policy
  • Deaccession and DMCA Takedown Policy

TwitterFacebookYouTubeFlickrInstagramBlogs

Sign Up for Our Newsletter
  • Re-use & Attribution / Privacy
  • Harmful Language Statement
  • Support the Libraries
Duke University