FLUID TEMPERATURE: FORMULA TO CALCULATE TEMPERATURE
FLUID TEMPERATURE: FORMULA TO CALCULATE TEMPERATURE
(OP)
FIRST ALL, HI TO EVERYBODY THIS IS AN EXCELLENT FORUM THAT HAS INFORMATION OF MUCH AID AND QUALITY FOR THE PROFESSIONAL.
I NEED YO KNOW IF EXIST A FORMULA THAT CALCULATES THE TEMPERATURE OF THE FLUID THAT IS IN THE INTERIOR OF THE PIPE , ONLY WITH THE EXTERNAL MEASURE OF TEMPERATURE OF THE PIPE.
THANKS FOR YOUR HELP
I NEED YO KNOW IF EXIST A FORMULA THAT CALCULATES THE TEMPERATURE OF THE FLUID THAT IS IN THE INTERIOR OF THE PIPE , ONLY WITH THE EXTERNAL MEASURE OF TEMPERATURE OF THE PIPE.
THANKS FOR YOUR HELP





RE: FLUID TEMPERATURE: FORMULA TO CALCULATE TEMPERATURE
There are correlations for heat loss from pipe. You should be able to work some of them backwards to find an estimate of the fluid temperature. But you would need more information, like flow rate, heat loss or temperature drop along the pipe, etc.
RE: FLUID TEMPERATURE: FORMULA TO CALCULATE TEMPERATURE
not with any reasonable accuracy
RE: FLUID TEMPERATURE: FORMULA TO CALCULATE TEMPERATURE
The best solution is to put some insulation around the thermocouple to prevent heat transfer to the environment, and get a more accurate reading of the fluid itself. So if you put a thermocouple on the outside of your line, and then insulate it for a few inches upstream and downstream of the thermocouple, you should get a reasonably accurate measurement (ie: within 10 degrees F) of the fluid inside the pipe.
RE: FLUID TEMPERATURE: FORMULA TO CALCULATE TEMPERATURE
Again a better definition of problem is needed.
Regards
RE: FLUID TEMPERATURE: FORMULA TO CALCULATE TEMPERATURE
RE: FLUID TEMPERATURE: FORMULA TO CALCULATE TEMPERATURE
If flow is steadystate with no great heat flow down the line, you should be able to insulate the line and just measure outside temperature as noted.
I guess you could put a couple of taps up and down the line, run tubing between them, and measure temperature in the tubing rather than the mainline.
RE: FLUID TEMPERATURE: FORMULA TO CALCULATE TEMPERATURE
here is a link to notes i use in my heat transfer course with all the equations thru a laminated pipe. there is a javascript calculator at the bottom. if you play with that and tweak the T's and k's, that should put you in the ballpark.
you can read the page source to review the script commands and verify that you agree with how i did it.
htt
regards
magicme
------------------------------------
"not all that glitters is gold"
RE: FLUID TEMPERATURE: FORMULA TO CALCULATE TEMPERATURE
applaud your efforts!
bear in mind of the difference between bulk temperature (what OP requested) and film temps (at pipe wall).
again, with information given by OP, the answer is NO.
good luck!
-pmover
RE: FLUID TEMPERATURE: FORMULA TO CALCULATE TEMPERATURE
I was thinking to combine several of the previous comments about insulating the pipe for several diameters up and dowstream of the thermocouple and using the mass flow rate to estimate internal HTC.
treat the insulation (radially) as a layer of the laminated pipe and guess at an external HTC (forced? natural?)
from that, as someone else commented, you could use the equations to 'back out' an estimated fluid temperature.
Obviously, lots of estimating here reduces your confidence in the answer, but it's an option.
regards
magicme
------------------------------------
"not all that glitters is gold"