essetamente. But that is governed by flow 90 deg or 0 deg to pipe axis, which gets Reynolds no and so on. Back to square 1.
Seems srfshs book is the only one, that has an answer, any other one I found so far only got xflow. Even that is more a cookbook, lots of factors to choose from, Nusselt...
there are 3 heat exchanger handbooks
Handbook for Heat Exchangers and Tube Banks design - Donatello Annaratone
Heat Exchanger Design Handbook - E. U. Schlunder
Heat Exchanger Design Handbook 2nd ed - Kuppan Thulukkanam
and this one has something on heat exchangers, too
Fundamentals of Heat and...
no. Its not homework.
We built some of these and it works, the liquid gets a bit cooler.
Its just troublesome to build, lots of little baffles and the ceiling. Longitudinal flow would just have 2 tubesupports, not 24 baffles.Pressure drop would be 1/4 of the cross flow design or even better.
I...
the plan is, liquid flows around the tubes as long as possible.
It works with all these baffles, but its 24 pieces and a pain to assemble. With the baffles the liquid takes 10 s to get through, because there is lots of dead zones, so it accelerates and just slaloms through. Without the baffles...
this is the actual shape of the fluid if you want (for CFD), its a sub partition of a round shell. The upper bit would be a condenser and then the liquid would enter at either end towards the tubesheet and works its way back to the centre, where the outlet is. So this shape greatest height is...
and this one has 2PSi pressure drop in the simulation at 1.5 gal/6 L per s, without even putting tubes in
The tubes have fins and if I use the formulas for flat plate, flow along the tubes is turbulent, so heat transfer should be...
something like this in the picture.
http://files.engineering.com/getfile.aspx?folder=2243381f-a4d8-453a-87d8-7d2d59056515&file=no_baffle_streamlines.jpg
hello again,
I got insane heat transfer coefficients. Average velocity of 1.5m/s, gets Re 152 000 for liquid Ra134a.
With that I get C1 0.021 and m 0.84, C2 0.98, Pr 3.32
Cross flow about aligned pipe stack.
so C2*C1*Re^m*Pr^0.36 gets me about 50 000?
formulas from Fundamentals of Heat and mass...
The tubes are supported every 800-1000mm (about 3 feet). Its 4 tube rows vertically and 15 tubes horizontally. So there is not much trouble with gravity. The flow is slightly uneven because thw outflow is at the bottom of one end and the inflow at the other end.
I think there will be some device...
I want to compare a tube bundle heat exchanger in crossflow with one that has flow parallel to the tubes. There is lots of material for cross flow, forced convection over flat plate, perpendicular to pipe, over a sphere and so on. But nothing parallel to tube
Hello,
can I calculate heat transfer parallel to pipe axis with the same formulas as heat transfer along a flat plate? I was reading several articles and there is always just heat transfer perpendicular to pipe axis.
As the pipes are quite long, flow is turbulent, so I think, the HTC will be...
