Longitudinal dispersion of flowing fluids in coiled tubes Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/dn39x440q

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  • Experimental measurements on the longitudinal dispersion of flowing water in coiled tubes were made using NaCi as tracer and conductivity measurement techniques. The 171 runs were made in coiled and straight 1/8", 1/4" and 1/2" I.D. polyethylene tubes from 25 to 300 ft. in length with coiling ratio, r/R[subscript c] (tube radius to coiling radius) from 0.00515 to 0.07407, and at Reynolds numbers from 108 to 45,000. The results show that: a) In both laminar and turbulent regimes the longitudinal dispersion in coiled tubes was lower than in straight tubes for the same Reynolds number and same flow regimes. b) Coiling causes the transition from laminar to turbulent flow to occur at higher Reynolds number. c) In certain regimes, coiled tubes had larger longitudinal dispersion values than straight tubes because coiled tube flow remained in the laminar regime, while straight tube flow was turbulent. The results were analyzed and compared with previous investigators; the final quantitative findings are as follows: a) The transition to turbulent flow as a function of coiling is given in Figure 16. b) In the laminar regime the longitudinal dispersion is represented by Figures 12 and 13. c) In the turbulent regime, the longitudinal dispersion is represented by Figure 14. d) Onset of secondary flow to affect the longitudinal dispersion at low Reynolds number depends on the curvature ratio, and is represented by Figure 20. These results are consistent with other investigators' findings.
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