Theoretical expressions have been derived for velocity distribution and volumetric flow rates for the co-current laminar stratified flow of two immiscible liquids in rectangular conduits. Results are presented in terms of the relative depth of the more viscous phase and the pressure gradient reduction factor for a wide range of viscosity and aspect ratios.
Theoretical results are reasonably well verified by experimental data at viscosity and aspect ratios of 5.326 and 7.95:1 respectively. The results suggest that a Lockhart-Martinelli type correlation should be valid at high viscosity ratios and at low input volume fractions of the more viscous phase.
On derive les expressions theoriques pour la distribution de vitesse et le debit volumetrique pour l'ecoulement laminaire, stratifie et co-courant de deux liquides immiscibles dans une conduite rectangulaire. On preesente la resultats en fonction de la profondeur relative de la phase la plus visqueuse et de la diminution de perte de charge pour une gamme etendue de rapports de viscosite et de rapports geometriques (hauteur/largeur).
Les resultats theoriques sont raisonnablement verified par les donnees experimentales pour les rapports precites de 5.326 et 7.95:1 respectivement. II est suggere par les resultats qu'une correlation du type Lockhart-Martinelli devrait ětre valide pour des rapports de viscosite eleves et pour des fractions volumetriques faibles de la phase la plus visqueuse.
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