2016
DOI: 10.1016/j.expthermflusci.2015.10.025
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Abstract: Interfacial friction is one of the key variables for predicting annular two-phase flow behaviours in vertical pipes. In order to develop an improved correlation for interfacial friction factor in downward cocurrent annular flow, the pressure gradient, film thickness and film velocity data were generated from experiments carried out on Cranfield University's Serpent Rig, an air/water two-phase vertical flow loop of 101.6 mm internal diameter. The air and water superficial velocity ranges used are 1.42-28.87 and… Show more

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Cited by 18 publications
(9 citation statements)
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References 28 publications
(42 reference statements)
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“…The specified range of measurement of the transducers is (0-1.5 barg ±0.04%). For film thickness (measurements were between 0.7-1.3 mm), the uncertainty is ±3.3% as estimated by three repeated film measurements; while for the film velocity, it is = ±8% of local measurements (see Aliyu et al [40]). The uncertainty in the gas core density is not readily available since they are derived quantities.…”
Section: Appendix a Error Estimation For The Current Friction Factor mentioning
confidence: 98%
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“…The specified range of measurement of the transducers is (0-1.5 barg ±0.04%). For film thickness (measurements were between 0.7-1.3 mm), the uncertainty is ±3.3% as estimated by three repeated film measurements; while for the film velocity, it is = ±8% of local measurements (see Aliyu et al [40]). The uncertainty in the gas core density is not readily available since they are derived quantities.…”
Section: Appendix a Error Estimation For The Current Friction Factor mentioning
confidence: 98%
“…The assumption here is that as the liquid films are very thin (~ 1 − 1.5 ), the velocity profile within the film is such that the wave (or structure) velocities are close to the bulk film velocity, meaning velocities with higher uncertainty for the thicker films. Nevertheless, uncertainties of around ±8% in the film velocity measurements were produced and this has been discussed extensively [40].…”
Section: Film Velocity and Entrained Droplet Fractionmentioning
confidence: 99%
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“…This results in a full-scale error of ±3.3% in the film thickness. Temperature correction Previous studies were carried out with the film thickness probes and provide detailed descriptions of their design and calibration [4], [28]- [30].…”
Section: Conductance Film Thickness Probesmentioning
confidence: 99%