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darrenabrown
Active Contributor
Engineering Fields - Electrical Engineering - New Member

Join Date: May 2008
Location: Rotherham, South Yorkshire
Posts: 13

Heat dissipation formula for rubber.

05/22/2008 9:20 AM

Hello,

this is my first time on cr4 so please be gentle with me. So my question, I am trying to find the cooling formula for rubber so that I can find the retention time required to cool my rubber blanks from 50c to around 25c. They will be falling from a strainer into a tank with a water and anti-tack soultion, which is part of a swan neck conveyor, then passed under 2 fans to a hight of 1.5m then into a box. The water will be constantly pumped through a heat exchanger so the temp of the water should remain at around 15c. If anyone can help me that would be great. I look forward to helping many people out in the future.

Regards.

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Bluestone
Guru

Join Date: Nov 2006
Location: OH USA
Posts: 549
Good Answers: 27
#1

Re: Heat dissipation formula for rubber.

05/22/2008 9:36 AM

Rubber is a generic term and any cooling time calculated for "rubber" would be approximate at best. In order to determine cooling time, the specific formulation must be known.
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darrenabrown
Active Contributor
Engineering Fields - Electrical Engineering - New Member

Join Date: May 2008
Location: Rotherham, South Yorkshire
Posts: 13
#2
In reply to #1

Re: Heat dissipation formula for rubber.

05/22/2008 10:25 AM

The type of rubber is epdm, I do not have the exact formula. I hope that this will help I also think that the k is 0.16 if this is of any help.

Regards.

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Milo
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Join Date: Jul 2006
Location: "Dancing over the abyss."
Posts: 4884
Good Answers: 243
#3

Re: Heat dissipation formula for rubber.

05/22/2008 9:49 PM

Darren, As important as the composition is the mass and section thickness of the blanks. The surface area to volume ratio is important. think of cooling a pancake vs cooling a muffin. thepancake will get to the lower temperature faster. What is length of conveyor? The more data that you can provide, the more likely someone will be able to help you out...

You did a great job of explaining what you are trying to do, now give us the facts we need to help.

milo

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darrenabrown
Active Contributor
Engineering Fields - Electrical Engineering - New Member

Join Date: May 2008
Location: Rotherham, South Yorkshire
Posts: 13
#4
In reply to #3

Re: Heat dissipation formula for rubber.

05/23/2008 3:43 AM

Sorry about the omission of the length of the conveyor and the size of the blanks. The largest blank will be 100mm in length and 36mm in diameter. The length of the conveyor has yet to be determined however I was looking at around 2M with a variable dwell period that can be controlled via a 10 turn pot. I hope that this is enought information, if not then please do not hesitate in contacting me again.

Regards.

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tesser
Associate

Join Date: Dec 2006
Location: Manchester - England
Posts: 30
Good Answers: 3
#5

Re: Heat dissipation formula for rubber.

05/23/2008 4:12 AM

Looks like you have an unsteady state heat transfer problem.

I would consult a good heat transfer book, 'Process Heat Transfer' by Kern is one of my favourites as it has lots of examples. I think you will need to find out about the 'Schack Chart' and 'Gurney-Lurie Charts'.

Good luck it looks like an interesting problem.
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