Sonsivri

Hi

how to design a heat sink without going into mathematical details.

e.g requires the heat sink for LM317 which dissipating a 10watt power
using flat aluminum sheet having 3mm thickness.

Irregardless of the amount of dissipation in said design as has been pointed out, it's really dollar stupid to design your own heat sinks when properly designed commercial ones are so cheap...

You can get some very decent legacy used computer CPU heatsinks for free or dirt cheap, you simply can't make or even consider designing one for the cost of buying and properly mounted they can easily dissipate 10W and laugh back at you asking for more...

I know you are going to hate me for this and it is shitty and super anal, but it's one of those pet peeves.  Irregardless isn't a word.  Use regardless.

http://www.dictionary.com/browse/irregardless

Usage Discussion of irregardless
Irregardless originated in dialectal American speech in the early 20th century. Its fairly widespread use in speech called it to the attention of usage commentators as early as 1927. The most frequently repeated remark about it is that “there is no such word.” There is such a word, however. It is still used primarily in speech, although it can be found from time to time in edited prose. Its reputation has not risen over the years, and it is still a long way from general acceptance. Use regardless instead.

10 Watts? Seem like you have a serious design problem. I am not sure what package you plan to use, but I think if you need to dissipate 10W, then its going to be trouble.

I suggest you look at putting an outboard transistor (look it up) to help share the power dissipation or if you can tolerate the cost and noise, look at a switch mode solution.

Have these options been considered? If it were my design and I found I needed to dissipate 10W in a single package, I would be looking at how to re design for a better situation.

Even if you find a heatsink, 10W - yuck.. you really want to do that?

He may want to heat his work bench, you do know winter is coming.

And you might hate me for this, but I'm not a student in your anal English class...  A Nonstandard word does not equate to not being a word, it is in fact a word in common use even if your self elevated $@#$% anal pet peeve jumps up and down screaming it's not...

Words and speech in any living language are ever evolving, especially in the English language that has distinct forked dialects worldwide...

http://www.merriam-webster.com/dictionary/irregardless

A good read that will most certainly get your pet peeve is a hissy...

http://www.huffingtonpost.com/jonathon-owen/yes-irregardless-is-a-wor_b_4434749.html

Your huffington post article is absolutely right "To put it a different way, the problem with irregardless is entirely social: If you use it, you’ll be thought of as uneducated, even though everyone can understand you just fine." That was really my only point.