Talk:Entrance length (fluid dynamics)

This article is or was the subject of a Wiki Education Foundation-supported course assignment. Further details are available on the course page. Student editor(s): Krbuw (article contribs). Peer reviewers: Rmason81, MissAndrea.

This article was nominated for deletion on 27 June 2014 (UTC). The result of the discussion was keep.

Physics: Fluid Dynamics Start‑class Low‑importance

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The article lacks sources for most claims in the article text and information displayed in the illustrations. Source 3 is included within the reference section, but not attached to any claims in the article. The three sources in the reference section are good and unbiased, but additional sources and better citation of the sources within the text is needed. Adding punctuation and rephrasing confusing sentences can improve readability. Specifically, phrases containing “we” such as “We can see in this image” should be removed. The section on Average Velocity focuses on velocity in the fully developed flow region (not the entry region) and may be better placed in a different fluid mechanics article. Also, the article can be linked to additional fluid mechanics articles such as Fluid Dynamics, Prandtl Number, Reynolds Number, Nusselt Number, Laminar Flow, and Turbulent Flow. Additional content may be added that provides a more detailed description of entry length and when the entrance region is considered to have transitioned into the region with developed flow. Discussion about importance of entrance length and its context in fluid mechanics is needed.

Krbuw (talk) 03:34, 14 January 2017 (UTC)[reply]

Planned additions to article

I'm planning on adding several sections that focus on better describing the characteristics and mathematics of entrance length. Possible topics include: Boundary Layer, Hydrodynamic Entry Region, Laminar Flow, Turbulent Flow, Effect on Heat Transfer, Relation to pipe and fluid conditions, Derivation, and additional descriptions about each of the regions located around the entry region. I will also add sections focusing on the importance of entrance length and the topic's context in engineering and fluid mechanics. I will discuss the importance of entrance length for calculation and design. One example I found was for accounting for entrance length when positioning flow instrumentation. I will also explore the circumstances when entrance length is relevant to calculations. Finally, entrance length will be given context in it's relationship to other fluid mechanics topics such as Reynolds Number, Prandtl Number, Nusselt Number, Turbulence, head loss, velocity profiles, and others.

Potential sources for additions

1. 1924-, Stewart, Warren E.,; 1925-, Lightfoot, Edwin N., (2002-01-01). Transport phenomena. J. Wiley. ISBN 0471410772. OCLC 46456316.

2. L., Bergman, T.; P., Incropera, Frank (2011-01-01). Fundamentals of heat and mass transfer. Wiley. ISBN 9780470501979. OCLC 713621645.

3. 1961-, Lienhard, John H., (2011-01-01). A heat transfer textbook. Dover Publications. ISBN 9780486479316. OCLC 853622802.

4. M., Cimbala, John (2006-01-01). Fluid mechanics : fundamentals and applications. McGraw-HillHigher Education. ISBN 0072472367. OCLC 56481360.

5. 1939-, Okiishi, T. H. (Theodore Hisao),; W., Huebsch, Wade; 1959-, Rothmayer, Alric P.,. Fundamentals of fluid mechanics. John Wiley & Sons, Inc. ISBN 1118399714. OCLC 781279071.

6. M., Cohen, Ira (2008-01-01). Fluid mechanics. Academic Press. ISBN 9780123737359. OCLC 647911370.

7. Taher., Schobeiri, Mohammed (2010-01-01). Fluid Mechanics for Engineers A Graduate Textbook. Springer Berlin. ISBN 3642115934. OCLC 873659245.

8. Marghitu, Dan (2001). Mechanical Engineer's Handbook. Elsevier

The article reads pretty good, grammar is good. There are some sections where it seems like it may be missing sources, such as the boundary layer and some of the equations that are used. The use of graphics is very helpful in explaining the topic. I am unsure if they are your own graphics are if they are sourced. It sounds like you plan on adding how entrance length applies to engineering which should be a good addition to the topic. Overall you have good sources with very few missing it seems. — Preceding unsigned comment added by Rmason81 (talk • contribs) 22:22, 14 February 2017 (UTC)[reply]

Thanks for the review Rmason81. Much of the content for the hydrodynamic entrance length came from an author from many years ago and is based off of one textbook. I'll cite the claims that are made and add additional sources. The graphics are from another Wikipedian, but the info they are based on appears to come from Fluid mechanics : fundamentals and application, I'm currently researching and writing about applications. It is difficult because entrance length/entry region is rarely mentioned by name. Looking into wind tunnel design and heat transfer applications.

Krbuw (talk) 02:38, 23 February 2017 (UTC)[reply]

Peer Review

Hello Krbuw,

For the purpose of this class, I've moved my peer review from your sandbox to here.

-Good start on your article! -I like that the language is encyclopedia and objective. -Overall, the spelling, grammar, and sentence structures look sound, and I like that the lead section has concise sentences (for example, the definition of entrance length). -I would expand on your subheading "Thermal Entrance Length" (cover any content gaps) and define the variables in that equation. -Also, I would find more sources for the content under "Average velocity," "Entry Length for Pipes with Noncircular Crossections," "Shear Stress," and "Boundary layers."

MissAndrea (talk) 04:09, 14 February 2017 (UTC)