Problems of Heat and Mass Transfer - Conduction Part 1 | Mechanical Engineering

[@opiana86]

10:10 in your video, I believe part of the second part of your equation in Question 2 was cut off on the right hand side. I am not understanding how you came up with 0.0588m. Could you kindly explain the steps that you did not draw out in your lecture? Thanks in advance.

[@MechDimension]

You can easily calculate the value of x as we already have value of all the variables in that equation. The value of Area (A) is same for all walls as mentioned in 6:55. Check 6:55 to know how you can get the values of A and ∆t.

[@khanbros2450]

5:59 you have done a mistake writing lb which was kb but nice explanation..

[@MechDimension]

Thanks for pointing out this mistake.

[@tejaskhamkar387]

Really helpful sir Nice explained 👍🏻👍🏻🙏🙏

[@muhammadaqeefnuqmanbinaziz3199]

hello sir can i ask if the thermal conductivity in Kelvin, do we need to change Temperature unit in Kelvin too?

[@MechDimension]

You don't need to change that because here we are taking temperature difference in the formula. Temperature difference come out same in both cases. You can try it yourself. But you need to be careful while writing the unit. For avoiding any error you can convert temperature in same unit as thermal conductivity.

[@surya691]

It gets cancelled

[@surya691]

Good 👍

[@anshupriya2269]

Thanku so much 🙂

[@PradeepGupta-vq2re]

Very interesting & informative

[@renuyoga]

0:51 sir point ke baad no alag alag bolte hai

[@MechDimension]

Thanks for pointing out that mistake. I will keep that in mind while making next video.

[@simransingh7684]

Why are you comparing ht by conduction and ht by convection in last problem..

[@yahitajam7944]

Sir, in second problem how is heat transfer by conduction is equal to heat transfer by thermal convection

[@MechDimension]

Here we are only dealing with conduction, not convection. I have not equated conduction and convection in problem 2. Can you specify the time of the video where you have doubt?

[@osgnaywang967]

Can you explain how you got the value of x in second problem?

[@MechDimension]

@@osgnaywang967 Again refer to Case 2 in the solution of problem 2. First, we formed the equation of Q2 in terms of x, after that we used the condition given in the question. Just open the video and refer the Case 2 again.

[@rutvikchaudhari2579]

It's a great sir

[@kelechilinda3276]

I don't understand the change in temperature used in solving the second question and how the length of the third wall was gotten.

[@MechDimension]

Please check 07:07 The outer surrounding temperature is taken as wall outside temperature and inner surrounding temperature as the inside wall temperature. Think of it as a house wall where t1 is inside house and t2 is outside.

[@mohammadviquar6357]

Well explained

[@ayushmanchakraborty9767]

why are we not considering 3 walls in second prblem

[@MechDimension]

Read the question properly. I have used 2 walls to calculate Q1 and 3 walls to calculate Q2 and then compared it according to the condition stated in the question.

[@haydarhoujeij5641]

The heat transfer by definition=the thermal conductivity * delta T (correct) A=L*H=0.22*standard hight(3m) =0.22*3=.66(not correct).

[@AllinOne-pz7ws]

Tnx you

[@rodelmasalan5102]

What app is your using sir?..new subcriber here.

[@osgnaywang967]

Can you explain the second problem?

[@MechDimension]

Watch it again you will understand.

[@thrivenkumar3007]

I have a doubt in the last problem by solving 1st case Q=1000/v ?im understand bro will u please explin it.But eplaination was good.

[@MechDimension]

Try to see that part one more time and tell me the specific part which you don't understood.

[@sreeharicr4099]

Sir please do one video for isro scientist exam problems in hmt

[@MechDimension]

Should I make video on previous year problems?

[@cornfield7020]

GOOD

[@mecheritamilavan4452]

Sir update all units impartant problem

[@MechDimension]

Okay. I will update.

[@ajayausarmal5809]

Thank you so much sir you save me

[@Vikas-vt8dh]

Thank you Sir

[@Un-bhakt]

Noice

[@PANKAJYADAV-my5qq]

Sir Hindi me btao please

[@haydarhoujeij5641]

Your calculation is false in question 1 , your value is in m not in meter square.

[@MechDimension]

Answer is correct. Consider the unit of k in numerator also. Unit of k is W/m°C, unit of Temperature is °C, and unit of length is m. When you put all these in the equation you get the required unit as W/m^2

[@mohammedbaramim7639]

thanks man