What is the link between Reynolds number and heat transfer coef. 1

• Jul 18, 2014

• Thread starter
• #2

editheraven

Petroleum

Nov 27, 2013

3

RO

Sorry the pictures got uploaded wrong. Here they are

http://imgur.com/a/sVoDf

 

Upvote 0 Downvote

• Jul 19, 2014

• #3

BigInch

Petroleum

Jun 21, 2006

15,161

GB

Increasing Rn usually corresponds to increasing mass flow. Heat transfer also increases with mass flow.

You might notice some differences at very low Rn when convection heat transfer becomes more dominate than conduction heat transfer.

you must get smarter than the software you're using.

 

Upvote 0 Downvote

• Jul 19, 2014

1
• #4

dcasto

Chemical

Jul 7, 2001

3,570

US

Normally the higher the turbulence, the better the heat transfer coefficient. Look up a heat exchanger "turbulator"

 

Upvote 0 Downvote

• Jul 19, 2014

• Thread starter
• #5

editheraven

Petroleum

Nov 27, 2013

3

RO

Thanks for your answers. They really helped me.

 

Upvote 0 Downvote

• Jul 21, 2014

• #6

moltenmetal

Chemical

Jun 5, 2003

5,504

CA

In turbulent flow, film coefficients vary as Re^0.8. In laminar flow, what it works out to is that you need the same area irrespective of tube diameter. But exchanger performance is complex- there are a lot of factors at play, and what matters most is which resistances to heat transfer are controlling.

 

Upvote 0 Downvote

• Aug 15, 2014

• #7

processeng2014

Chemical

May 21, 2014

19

US

All transfer (heat, mass, momentum) is proportional to turbulence.

 

Upvote 0 Downvote

• Aug 15, 2014

• #8

25362

Chemical

Jan 5, 2003

4,826

CA

Except, probably, for Braess paradox

 

Upvote 0 Downvote

• Aug 28, 2014

• #9

MortenA

Chemical

Aug 20, 2001

2,998

DK

Check out the explanation of te Nusselts number

http://en.wikipedia.org/wiki/Nusselt_number

 

Upvote 0 Downvote