A laminar fl ow element (LFE) (Meriam Instrument Co.) measures low gas-fl ow rates with
Chapter 6, Problem p6.31(choose chapter or problem)
A laminar fl ow element (LFE) (Meriam Instrument Co.) measures low gas-fl ow rates with a bundle of capillary tubes or ducts packed inside a large outer tube. Consider oxygen at 208C and 1 atm fl owing at 84 ft3 /min in a 4-indiameter pipe. (a) Is the fl ow turbulent when approaching the element? (b) If there are 1000 capillary tubes, L 5 4 in, select a tube diameter to keep Red below 1500 and also to keep the tube pressure drop no greater than 0.5 lbf/in2 . (c) Do the tubes selected in part (b) fi t nicely within the approach pipe?
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