Vertical U-tube HX tube side velocity
Vertical U-tube HX tube side velocity
(OP)
Hello All,
I am trying to figure out velocity in a vertical U-tube heat exchanger. the tubes are 3/4" OD, 0.065 wall thickness, and number of passes = 2.
I have a volumetric flow rate and I would like to calculate the minimum and maximum velocity in the tube side. Also what would be the flow rate in the pipe at its maximum velocity?
Thanks
I am trying to figure out velocity in a vertical U-tube heat exchanger. the tubes are 3/4" OD, 0.065 wall thickness, and number of passes = 2.
I have a volumetric flow rate and I would like to calculate the minimum and maximum velocity in the tube side. Also what would be the flow rate in the pipe at its maximum velocity?
Thanks





RE: Vertical U-tube HX tube side velocity
Divide vol per tube flow by area of pipe this gives velocity in each tube. Assuming clean service, balance flow, etc
RE: Vertical U-tube HX tube side velocity
I was using the following formula:
Velocity = (Flow Rate * Vf * Passes) / No. of tubes
Velocity, ft/sec
Flow rate , gal/min
Vf = velocity factor
for standard tubing,
1/4" = 9.66
3/8" = 4.02
5/8" = 1.47
it doesnt have the velocity factor for the 3/4" tube. can anyone help with this data?
RE: Vertical U-tube HX tube side velocity
Take the flow rate in the pipe. (xx gpm) Convert that to gallons per second. Then divide that flow rate by the number of complete u-tubes. That will give you gallons per second per tube. Convert gal/sec to cubic inches/second. Then divide that by the cross-sectional area of one tube.
Now you have the velocity in the tube in inches/second. You should be able to convert that to any units that make you happy.
Regards
StoneCold
RE: Vertical U-tube HX tube side velocity
Doug
RE: Vertical U-tube HX tube side velocity
Its simple enough....I was trying to compare the basic principles method with the velocity factor method! thats all
thanks
RE: Vertical U-tube HX tube side velocity
Doug
RE: Vertical U-tube HX tube side velocity