Introduction to Viscosity - Lecture 1.2 - Chemical Engineering Fluid Mechanics

Introduction to the concept of fluid viscosity and its definition in terms of the relationship between shear stress and deformation.
This video is part of a series of screencast lectures presenting content from an undergraduate-level fluid mechanics course in the Artie McFerrin Department of Chemical Engineering at Texas A&M University (College Station, TX, USA).
The screencasts have been prepared in 720p HD with accompanying closed captioning for enhanced accessibility.
My inspiration for producing this series of videos has been my lifelong personal journey to understand fluid mechanics and explain its beauty to others in a straightforward way. I have received no external support for this project...the effort is purely a labor of love.
I would like to acknowledge Aashish Priye and Jamison Chang for assistance in developing the materials and preparing the captioning.
Please feel free to share any comments or suggestions.
Best wishes,
Victor Ugaz

[@Karlwojo1]

finally, a chemical engineering professor who actually takes the time to teach material in an understandable manner

[@JDGWI]

Lol my transport professor is crazy. Went over this 10x and no one understands truly

[@medotedo8410]

@@JDGWI Those types are useless they tried hard to hide their weakness by making it seem very easy and rush through the topics.

[@studywithsingh5065]

Among 100s of videos on viscosity ,finally i found the best one.THANKS A TON Sir.

[@sriramguptavoruganti5011]

I spent a semester trying to understand these concepts, but finally it takes 16 min to understand this .. Thanks a Lotttt

[@LetsBringPeace]

I'm a chemist and I find this very useful for where I work. I needed a quick reminder in fluid mechanics. its been years since i had a mechanics course

[@MartinKG]

Victor Ugaz...Thank you sir - the 'velocity gradient' now makes a lot of sense.

[@YashTambi]

Brilliant videos. Kudos!

[@MrJuninhovl]

Thank you so much, that's the best lecture of ever. Keep doing this, we all thanks you.

[@actingsub-lt.somkiatmaitho1843]

It's very good for learning.Thank you so much.

[@sophiahassiotis9084]

Great explanation...thanks

[@adaismr]

Excellent video!!!

[@rdyjur]

thank you sir very well explained. Before I knew velocity as a formula now I understand it

[@chuntinglau550]

Thank you! explained very well!

[@williamblake3795]

Thank you sir. U Rock!

[@aycatuncel2527]

thank you for your videos, I appreciate

[@singsiriiiriiriss]

For a Newtonian fluids however, if you alter V (thus dVx/dy) and relate the shear stress to dVx/dy - this relation is linear. I am a great fan of your videos, your didacticts are great, I am teaching Rheology and I sometimes take inspiration from your examples. Thank you so much. Best regards, S.H.

[@GiorgosdGG]

Great explanation ! thanks What kind of stylus/digitizer are you using in order to achieve this optical demonstration?

[@satadhi]

this is perfect!

[@cavewallmedia]

Straight forward explanation. Good pace and time length as well. Your work/effort much appreciated. . . thanks. Wondered if you selected a prefered software to help presentation?

[@0318kent]

such a good lecture

[@waynekirsner7667]

Great job on example of Navier Stokes from a 70 year old practicing mechanical Engineer/physicist who needed a Navier Stokes example. I agree with Karlwojo below-- you go slow but really make sure the student can follow why you're doing what your doing with the math. I'm going to watch the rest of your video's.

[@ahmadfarhat7689]

Thank you sooooo much you really helped me a lot

[@jonatasfurtado31]

You are very good at teaching. Thank you very much. Signed ; Jonatas Furtado, from Cuiabá city - Brazil.

[@amdperacha]

That is from the kinetic theory which describes the behaviour of particles in solid, liquid or gas. In liquids the intermolecular attraction are moderately strong and bonds are continuously breaking and reforming b/w them which allows the liquid particles to flow past each other instead of being held rigidly in position as in for sold particles.

[@sylvesternicholas6072]

great job

[@angelakagium7215]

ooh thanks guys for that innvation

[@dontstudyforexam1549]

Mannn .....You are a legend

[@ndjarnag]

Excellent

[@whosyourdaddy5719]

hi Mr.Ugaz, are you still teaching in tamu?

[@TheFirstBK]

Fantasticabulous!

[@vinhNguyen-tf5ew]

Thank you

[@rawna1]

Great video, thank you!!

[@ChemistryByKhannaSir]

thanks a lot.

[@CDinkle]

Would it be possible for you to show a basic example of how to calculate the forces on each plate, specifically in the case that both plates are moving?

[@singsiriiiriiriss]

Dear Prof. Ugaz, I do have small comment: you state that for "some" fluids we observe that the velocity profile is linear. This is in fact ture for all fluids, because the shear stress is a constant between the plates, thus the velocity gradient is per definition a constant (take a look at any flow curve - Newtonian or non-Newtonian).

[@mdsayeedreza8871]

thanks!

[@JamesVestal-dz5qm]

My pattern recognition was so high I over compensated for my memory by always recognizing every pattern in every class.

[@sylvesternicholas6072]

thank u

[@renzoandre5286]

What if the upper plate is at rest and the lower plate is moving? What would the slope be?

[@zstudy1]

I THINK IT WILL BE THE OPPOSITE IN DIRECTION

[@alphie10]

wow brilliant!!!!! Mechanical engineering student here starting in september :D

[@hasanhalim7772]

U must've graduated by now

[@TheChennairajan]

very nice and informative, please teach how the viscosity of a fluid of 350 cst be brought down to 50 cst.

[@bharathyvinod3936]

Hi

[@henryhsueh3553]

ChemBE savior!

[@satheshkumar8943]

nice...

[@moazzumgillani4852]

I didn't get the last part, As if by increasing the temperature of gas, viscosity goes down because of increased amount of collisions, But in the case of liquid, though the weak interactions are broken but they are also energized more, and more momentum will be transferred, So why the same thing is different for two cases

[@alvaro1121]

The velocity profile on Laminar flow is parabolic though, isn't it?

[@fhm4]

I think you're referring to the case where a pump pushes water forward, thus making the parabolic profile. But in this video, the example is "top layer/plate is pushed forward." He also mentions that he is using an approximation where the height is very small

[@nicolas.leger3]

11:36 Mentioned Tensors

[@motivationalasraful2517]

Sir please time live class ?

[@JamesVestal-dz5qm]

I have come a long ways in 11 days.

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[@BoZhaoengineering]

Engine oil use viscosity to grade a lot.

[@JamesVestal-dz5qm]

Ocd is a very serious working memory deficit.

[@atharvathakare]

11:30

[@musttestify259]

first comment !!

[@JamesVestal-dz5qm]

I can't even believe what I commented 11 days ago!

[@ilovesustainableenergy9563]

it's a bit strange thinking of liquids as having layers... surely only solids have "layers"

[@JamesVestal-dz5qm]

Pastor David brown helped me find a friend in christer aakeroy.

[@JamesVestal-dz5qm]

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Katarina kamenar had anger management issues and the same learning style as me.

[@JamesVestal-dz5qm]

So I'd ace the exam and not remember it later that day.

[@JamesVestal-dz5qm]

I brought forth evil fruit.

[@z4961]

Why do you call fluid mechanics chemical engineering?

[@JamesVestal-dz5qm]

My works were evil because I understood not.

[@JamesVestal-dz5qm]

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[@kurdaware]

great job