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# Calculating The Exit Temperature Of An Aqueous Solution In A Capillary

heat transfer conduction convection temperature

2 replies to this topic
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### #1 NRMO

NRMO

Brand New Member

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• 6 posts

Posted 17 April 2019 - 09:17 AM

Good morning,

I was hoping someone could help me with this problem.  I need to determine the exit temperature of an aqueous solution exiting a stainless steel capillary (k = 14-17 W/mC).  The solution enters at 25C at 1.2 mL/min, and the capillary is surrounded by a heater at 237C.  The length of the capillary is 114.4 mm with an ID of 0.508 mm and OD of 0.810 mm.  Assume physical properties of water for the solution.  The flow rate is high but still laminar.  I assumed that it was a simple conduction problem, but I am not sure how to calculate the amount of watts given off as heat from the heater.  Once I know this, I can then calculate the exit temperature of the solution.

Thank you

### #2 breizh

breizh

Gold Member

• Forum Moderator
• 4,943 posts

Posted 17 April 2019 - 06:51 PM

Hi,

Let you try this calculator I prepared a few year ago  or similar excel sheet in this forum (search engine ) by Stephen Hall or others .

Same methodology to apply ,in your case no insulation.

Good luck.

Breizh

#### Attached Files

Edited by breizh, 17 April 2019 - 07:28 PM.

### #3 NRMO

NRMO

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Posted 18 April 2019 - 06:38 AM

Thank you Breizh!