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Trouble finding priming tube length (similar to boiler tube)

Trouble finding priming tube length (similar to boiler tube)

Trouble finding priming tube length (similar to boiler tube)

(OP)
Hey guys. Been struggling with a problem for a bit and any help would be much appreciated. On a team designing a liquid fuel camp stove for an engineering class.

-Before fuel is combusted, it must be vaporized in priming tube.
-I am allowed to assume constant surface temperature on outer surface of tube. (Ts)
-Tube is divided into two regions.
-In region A, fuel is heated from tank temp (Tamb) to its boiling point (Tb). I think I have this section done, but I would not mind hearing alternate methods or confirming my own if it's convenient.
-More importantly, in region B, fuel is vaporized as Ts and Tf (fuel temp = Tb) remain constant.

I think everything will be known but length, which i am trying to find for each region

Given:
fuel properties (kerosene)
Ri and Ro (radii), if it helps Ri=~Ro
mdot

Assumptions:
constant Ts
frictionless
laminar flow


If values are needed to determine method
mdot=.000385
Ts=~1000K (Seems to high to me but thats what the teacher said so dont worry about it)
Ti=298K
Tb=~523K
Ri=.004m
Ro=.005m

Some of these values are undetermined, but should be within the ballpark

RE: Trouble finding priming tube length (similar to boiler tube)

(OP)
Oh and laminar flow is an assumption i asked my teacher if i could make. He said yes, but this does not necessarily mean it is a practical thing to do.

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