Turbulent Flow: Moody Chart [Fluid Mechanics #41]

An introduction to the famous Moody Chart! We use the Moody Chart often to estimate frictional factors.
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[@howdduckjr]

The chart is for laminar, transitional, and turbulent flows. Laminar flow is a constant where the friction factor is no longer related to roughness "e". Transitional flow is the one where both Reynolds # and relative roughness e/D are used. For the turbulent flow condition the friction factor is no longer a function of the Reynolds number, which is why the curve flattens to e/D; the values are read straight across in the turbulent region. So really there are three ways to read off friction factors from this curve, not just the one you are presenting. In addition, it would be helpful to note that there are 3 different scales to get used to on the graph: e/D is a skewed bell curve of log scale, f is a bell curve of log scale, and Re is a log scale.

[@Brauyin]

Very nice video. Made me realize i didn't do it right in my exam yesterday. But now i know how to use it. Thanks :)

[@birdsarentreal3054]

Thanks bruh 💙🌸
Pray for me i have an exam tomorrow 💔🌚

[@ibrahimmahfouz5710]

how was it ?
i have exam after 1 week and i'm gonna study from this channel, do you recommend it ?

[@siddhantpawar3572]

How was it?

[@tommysalami420]

good luck :P

[@zakeeshfatima6211]

How was it? 😂

[@BadAssBerries27]

Thanks this was clear. This deserves more views

[@nandha0150]

Moody's chart can be used for laminar flows too, for calculating the pressure drop in fully developed flows..
And Reynolds No. greater than 4000. Not 2000. 2000 - 4000 is Transient condition, as pointed out by many others..
Kindly correct it.

[@sumayyahabdulla288]

Thank you so much, you have saved me a lot of stress :)
- from a struggling Civil Eng student

[@SimmySigma]

Aw, I’m glad! You got this! I believe in you! 😎

[@jackwhitehead4149]

Starts at 2:11, you're welcome

[@missionfreelance4907]

Hence, moody's chart is a graphical diagram consisting of three components. They are a frictional factor(f) to the left, Relative roughness to the right, and Reynold's number to the bottom. We usually have one or two of these values. Then, we use those values to find out the required unknown values (usually f), then we apply the required formulas.

[@farisal-amer7635]

Wonderfully explained! Thank you as always!

[@andrewmoussa4688]

WHAT IF it wasn't perfectly on the line, let's say it was 0.003 and 2 x 10^5

[@MelodyTadeoJ]

2:13 of this video explains: www.google.com/search?q=how+to+read+a+moody+diagram&rlz=1C1JZAP_enCA815CA815&oq=how+to+read+a+moody+diagram&aqs=chrome.0.69i59l2.3695j0j9&sourceid=chrome&ie=UTF-8#kpvalbx=_HV5DXo35HsfVtAa-2o2wBg27

[@zvonimir-antestipic9025]

@@MelodyTadeoJ Give link of concrete video, not bunch of it. Still not found way for 0.003

[@MelodyTadeoJ]

@@zvonimir-antestipic9025 Even after opening the video this is the only URL that came up.

[@MelodyTadeoJ]

@@zvonimir-antestipic9025 I think it was the same as this one: czcams.com/video/PgAXycpuZqM/video.html&feature=emb_title

[@MelodyTadeoJ]

@@zvonimir-antestipic9025 Did you look at it?

[@williamscott8961]

Great Vid! Helped a lot

[@Diablo3Movies]

Helps a lot. Gretz from germany!

[@MauroVictor]

Thank you. That was a great explanation. Very clear.
Thanks a lot

[@nahalishh]

so clear ,thanks

[@pacificwanyo6810]

Thanks for this video..

[@adamalmuhana7410]

This helped a lot ty 🙏

[@MrMohitos]

Very good explanation, thank you!

[@danielzhang3725]

Thanks. That was extremely informative.

[@jafarialexander5105]

Any videos on how to use the wholly turbulent flow line to find the frictional factor?

[@NauTzZz]

at 0:28 you said if Re > 2000, flow is turbulent but it should be 4000. between that should be transitional.
Thanks for the video

[@SweRaider1993]

Different litterature tend to use different values depending on the context and how ideal the situation is. The transition can be anywhere between 1000 up to 5000. Reynolds originally found it to be around 2100. Most textbooks however say that the flow is unpredictable/transitional between 2000-3000. Your textbook may be focusing on a context where the flow is more unpredictable if the transition is between 2000-4000.

[@shobharanipeddi4306]

Re4000 laminar flow , 2000

[@sabaajlouni2463]

Very helpful thanks a lot

[@fizz1173]

thanks man, quite helpful

[@HappySunflower997]

thank you for the video, it help me a lot :)

[@aszxdwd]

thank you that was helpful for me

[@samuelacheampong9391]

Perfect tutorial

[@faridoondanesh5998]

thanks for the video.

[@Sarah-dg1ow]

Very helpful, thank you

[@birdsarentreal3054]

But if the pipes were "smooth" we directly use the first curved line "without using the coefficient of roughness".

[@meltingpig]

Simmy Sigma I like your simple formulaes which is easier to understand (School gave us long & complicated formulaes...). But i am a little confused now as i note that you are using moody diagram for use with darcy friction factor. However, i have a moody diagram with fanning friction factor. Will it affect any of the formulaes that you teach?

[@assiyatarkany550]

thanks it did help me really :)

[@marlonsaveri]

Thanks for the video. Question: "any turbulent flows" means "any liquid"? Liquid Nitrogen, for example? Or just water?

[@akshayroy1762]

this helped me a lot :D thank you :)

[@myanmar8dmusic722]

But I want to know how to assume the frictional factor if only Roughness is given!!

[@dhaneshgorade1626]

Assume friction factor for turbulent flow in rough pipe.

[@tommyvercetti419]

thanks dude

[@01olk]

thank you

[@jonathonjakobo]

thank you very clear :)

[@FaReS4201]

Thank you so much :)

[@katherinastefani3112]

thank you!!

[@zahran00wolf]

I have some calculation for my project which are re is 94 K and for Ks/D is 0.000047 but the corresponding value for f lies below the curve , so should i stick with the f= 0.25/(log10((ks/3.7D)+(5.74/Re^0.9)^2)))^2 ???

[@jasper78138]

I thought u will discuss about nature of graph nd various regions

[@sandarunavinda8343]

Thanks

[@amjoyhihi2321]

so good

[@jamesthorpe2359]

how would you find f if the relative roughness is 0?

[@hamdanalharbi2206]

+1 subscriber!!

[@Matdogg2k]

Why do the numbers on the horizontal axis (Above: VD and Below: Reynold's Number) repeat itself over and over? Which one do I choose? There's like 3 or 4 sets of the same numbers

[@Matdogg2k]

Justin Williams
Thank you Justin

[@hassanlive4]

thanks, very helpful :))

[@keshavgopaul5491]

what if relative roughness was 0.00008 ?

[@ayyubgavandi5902]

my consept not clear for nikurdse expriment plz say

[@candycandy319]

what do u do for roughness number in between?

[@BryanRodriguez-wj9ls]

How to begins at 2:39

[@ilsAndrew]

ty!

[@Mrius86]

Thanks.

[@xjosex64]

what are the bold curved lines for?

[@muhammadismailmalaysia869]

thank bro..now I know to use moody chart

[@bruva4manovamova]

what if we have a reynold's number equal to 2.10^4 and relative roughness of 0.008?
do I follow the black line as it curves up or do I take the crossing of the vertical line at 2.10^4 and horizontal line at 0.008?
thanks

[@danod6123]

I think if you follow the line you will be alright. Hope this helps - Dr.Dan 👍

[@emanuelcastanho470]

Try with 1.25 velocity on youtube

[@birdsarentreal3054]

@@cameronledoux95 *velocity ,so we don't use the term of "speed" in fluid mechanics :D

[@Hidden-truth-revealed]

Let me give you a good kiss bro 😘🤗. tomorrow is my paper and our sir just mentioned it.he did not make us understand.you helped me out.keep helping out people💖🇵🇰

[@SimmySigma]

Ah! I’m so happy that the content has helped you!! I’m glad you found the content useful and I’ll continue making sure I can produce more education content for students everywhere! 😊

[@anuragkashyap2975]

nice elaboration , but 1.25 speed is better to understand

[@arifmastor716]

hmm . can't understand sir

[@thanhle2560]

Trời ơi. Sao lại nói tiếng anh.. Có ai cứu vớt tôi với.. Huhu.. K muốn học lại hoá học TP đâu

[@user-jr1pj8tl5f]

А по русски?

[@aysesaglam3295]

hiç türk mühendis yok muuuu

[@PCgamerChannel]

Awful the bottom part still confuses me "if you get 2(10^6) give an example of actually fucking finding it

[@francismburu8227]

Thanks a lot i hv benefited

[@mustafacivil2]

thanks