Heat Transfer (09): Finned surfaces, fin examples

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Heat Transfer (09): Finned surfaces, fin examples

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CPPMechEngTutorials

Күн бұрын

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@oneofyk 3 жыл бұрын

this is such a great series. cant say enough how great it is to have these resources during this time of online learning

@CPPMechEngTutorials 3 жыл бұрын

We live in amazing times.

@jasonbenny5118 Жыл бұрын

am regreting this why i didnt give much attention to this channel, i would have toped my class. but not too late, hope to learn more from you guys. hey! my man behind the lens bro you are legend, man! love you

@CPPMechEngTutorials Жыл бұрын

It's never too late. :)

@learnngrow3218 2 жыл бұрын

Grateful to God to provide such world class lesson's from a world class teacher. Inexpressible in world's Long live sir ❤️ May God bless you with everything ❤️

@mustafaenesyaldiz 2 жыл бұрын

Hey we use Af for (2wLc+2tLc) but in the book( incropera) it shows only 2wLc. Which one is correct ?

@shopeekoin7293 3 жыл бұрын

I think the requirement to using case D (Infinite length) is when ml>2,65

@nicklarosa3816 2 жыл бұрын

mL or mL_c? he said mL_c >= 2.65 but then in calculation he used L?

@trustmeiworkhere8183 2 жыл бұрын

I too am wondering abour the mL>2.65 vs mL

@trustmeiworkhere8183 2 жыл бұрын

Okay I found a textbook that says "mL (not L_c) >=3 is sufficient for the infinite fin approximation." So his original statement of mL >= 2.65 is correct. Also, the A in the m equation is always the cross sectional area of the fin. I thought it might be useful to know that, as I find I get all these areas mixed up.

@Rback189 Жыл бұрын

Yes. He makes this correction at the start of next lecture.

@Rback189 Жыл бұрын

@@trustmeiworkhere8183 L_c is for adiabatic fin tip - tip area not included in heat loss calc.

@fuji4128 4 ай бұрын

thank you so much for your work prof John Biddle. why wasn't the profile area of the triangular fin included in the Area of Af ? dividing over w then would leave you with a w in the denominator of the profile Area term. can someone please elaborate on this?

@inkitrajmahat6839 2 ай бұрын

In previous lecture 8 you said ml should be greater than 2.65 but in this numerical the condition is different why is it so?

@MrSun-th1qw 3 жыл бұрын

At about 34:13. When you calculate A_f, don't you need also consider the sections front and back? You just got the the area of top and bottom. cause front and back are touching the air as well...... what do you mean?

@jay.jay. 2 жыл бұрын

I'm struggling to understand how to calculate the Af (the one you mentioned in this comment). For example, for shapes rectangular or for square

@MrSun-th1qw 2 жыл бұрын

@@jay.jay. Hi, Jaylane, Af is nothing but the surfaces that interact with the air. You'd better think the problem in 3D in your mind. So, ex) rectangular is consist of 4 faces which touch the air. As you know the dimensions of those parameter, it is easy to get Af. Hope that helps you bit.

@nurmuhammadsumon2729 Жыл бұрын

@@MrSun-th1qw shouldn't we consider the area of the fin tip?

@S.emredal Жыл бұрын

@@nurmuhammadsumon2729 for the corrected length, you don't need to think area of the fin tip. It is assumed to be adiabatic. However, I still have a confusion about the triangular fin part. Why don't we include the front and back areas? Maybe, they aren't included because these areas are too small and are negligible for very thin fin

@kingaegon3715 5 ай бұрын

at 34:25 shouldn't the sqr root be applied only to the parenthesis? (and not to the number 2 that is multiplying it? (explanation: the sqr root comes from Pythagoras s equation to get the hypotenuse and then since we have two surfaces we multiply the result by 2)

@henrique_vidal 5 ай бұрын

Yes, i agree with you

@georgekaras7162 3 жыл бұрын

Im not sure but I think at 33:52 the 2 on the left should not be inside those brackets to be square rooted

@ProfessorGreen900 3 жыл бұрын

You are right. I agree with you.

@MrSun-th1qw 3 жыл бұрын

u r right, got the same question. but it's obviously false.

@peemsam 3 жыл бұрын

You are right. It was corrected see the Video Notes

@s.n3243 2 жыл бұрын

شكرا

@dorukozcan3941 4 ай бұрын

Hello, while all four faces that touch the air are included in the rectangular adiabatic tipped fin area calculation, why are only the faces above and below in the triangular fin included in the fin area calculation? Also, according to Table 3.5, the adiabatic tipped fin's area should be calculated by 2 * w * L_c.

@devansh4762 6 ай бұрын

Can anyone tell me which book is he refering to?

@pizzabella_2356 6 ай бұрын

"Introduction to Heat Transfer" by Bergman et al. (from video description)

@hishamsalameh5750 8 ай бұрын

What a great effort But why doesn't our beloved professor go into some topics that are mentioned in the textbook like The fin effectiveness or the critical radius in chapter 3 Or heat heat generation???

@CPPMechEngTutorials 8 ай бұрын

There are a limited number of class sessions, so not every topic in the book can be covered.

@hishamsalameh5750 8 ай бұрын

@CPPMechEngTutorials is what he focuses on and explains the applied science in real-life problems ???? In other words, what he didn't demonstrate is not important

@raymundoloera 8 ай бұрын

I would say it everything in the book is important but again Heat Transfer is a complex topic and takes lots of learning I say if this is your first time taking H.T stick to these fundamentals and still invest your own time to learn other more about the topic if you see yourself doing this for you career@@hishamsalameh5750