External flow heat transfer, concentric pipes
External flow heat transfer, concentric pipes
(OP)
Hi guys, I have what I assume is a pretty basic problem but haven't found the correct formulas in my heat transfer book (I'm a bit rusty, admittedly). There are two concentric pipes (I believe it's referred to as annulus). The larger diameter has water running through it, to pull heat away from the internal pipe (a YAG rod).
I have all the properties of water, of course, and the "k" value for the YAG rod. I also know the power output of the rod (Q), and the desired flow rate (q) of the water. The area of the YAG rod is set, but the area of the outside pipe the water runs through has some room to work with (though we have a set flow rate in mind, so I can't really alter it much) I have a theoretical delta T in the water, though I'm not entirely sure it's correct. I'm also interested in the delta T of the internal pipe (YAG rod) How would I go about calculating this?
I know from examining flow rate that the Reynold's number says it is turbulent flow.
I have included an image of the pipes incase my explanation was confusing. Thank you in advance for any help!
I have all the properties of water, of course, and the "k" value for the YAG rod. I also know the power output of the rod (Q), and the desired flow rate (q) of the water. The area of the YAG rod is set, but the area of the outside pipe the water runs through has some room to work with (though we have a set flow rate in mind, so I can't really alter it much) I have a theoretical delta T in the water, though I'm not entirely sure it's correct. I'm also interested in the delta T of the internal pipe (YAG rod) How would I go about calculating this?
I know from examining flow rate that the Reynold's number says it is turbulent flow.
I have included an image of the pipes incase my explanation was confusing. Thank you in advance for any help!





RE: External flow heat transfer, concentric pipes
corus
RE: External flow heat transfer, concentric pipes
RE: External flow heat transfer, concentric pipes
TTFN
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RE: External flow heat transfer, concentric pipes
To model the fluid, could I use an equation such as:
Q=m*Cp*(To-Ti)
Where "Q" is the power of the Yag rod? I'm not sure if I'm using Q correctly.
RE: External flow heat transfer, concentric pipes
As for the YAG, the same approach previously mentioned would have to be used, i.e., a series of layers that are individually treated as isothermal layers separated by layers of YAG.
TTFN
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