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Ok. Now I am frustrated. How do you find the external convestion value? It is a function of temperature but could I use and average? But now, how to determine it? I took an approach of wanting a final temperature of around 60C to 100C and find a length of tube needed to attain it. With this...

Ok. Thank you. Now I understand it better. Appreciate the assistance.

Have a question. The Reynolds number is so small that assume laminar flow which should be at such low flow rate. I am assuming the 7 W/m2K is your h value? Where did that come from? I get a much smaller value from a different table at both 800C and 30C. Am I missing something? And dividing by...

Thanks. I'll look it over and jar my brains again. Inlet pressures were near atm or use 1 to 2 psig. And outlet guesstimate 5psig

The outlet pressure of the pump is guesstimated to be around 5psig. Inlet very low , near atm. Guesstimate 1 to 2 psig.

Thanks. It's been a while but I am digging into my old text. The situation has been clarified a bit. It's a 12 ft long 1/4 ss tube with incoming gas at 800C. The tube leads to the inlet of a pump with a flow rate approx 5 L/min. The tube sits in outside air around 30C ; no mechanically induced...

I only need an approx.

I'm brain dead and can't get the outlet temp for a simple problem. Please help. Here's the problem. I have a hydrogen gas stream flowing at approx 5 l/min. It's temp inside the tube is at 800 deg C. It will be flowing thru a 1/4 OD , 3/16 ID ss tube. The temp outside the tube will be approx 60...