Lecture 20 | Problems on Free Convection | Heat and Mass Transfer

[@pawan20032]

Sir tf = 94 0c is not given in data book how I can write their properties?

[@karnamramu854]

Sir Tf value 94° is not given in data book
How can you wrote sir

[@rabecamohammed9518]

For the second question, why did you calculate Gr twice? What is the difference b/w Gr and GrL?

[@user-tz6zl6gm6j]

for last problem how did u take it as vertical plate sir why not horizontal?

[@tompalavamshi4569]

yes how sir'

[@VENKATQ]

When the plate height is given, it must be considered as vertical plate...if length and width are given it can be considered as horizontal plate...blindly we can consider like above...but it depends on air flow direction...

[@ezinnekalu9481]

But for this problem, the length and with are given so why consider it vertical? Again, how did u get Lc to be 0.18?

[@DineshKumar-mt3ez]

We have properties for steam in data book . Why are you put air properties in 1st problem

[@VENKATQ]

Convection takes place by air only

[@awadheshverma9329]

so much better then other

[@sandeeprajr4125]

Sir, for first problem, Nu=hD/k right?

[@VENKATQ]

s...wrongly mentioned as hL/k...

[@sandeeprajr4125]

Okay

[@otw3166]

Thanks Sir

[@abhishekkumar-xm3nj]

SIR WHEN I AM CALCULATING MAX VELOCITY ITS COMING AROUND 0.031 BUT YOU HAVE WRITTEN 0.406

[@tompalavamshi4569]

for last problem how did you considered thet as a vertical plate

[@VENKATQ]

When the plate height is given, it must be considered as vertical plate...if length and width are given it can be considered as horizontal plate...blindly we can consider like above...but it depends on air flow direction...

[@RAJENDRAKUMAR-yn2ec]

nice
sir

[@VENKATQ]

Thank uuu

[@tompalavamshi4569]

giive reply