01901nab a2200217 4500 20260523200032.0 260224s2015 xxu ing Inglés Teixeira, R.G.D. 54923 Secchi, A.R. 54924 Biscaia, E.C. Jr. 54925 Two-Phase Flow in Pipes Numerical Improvements and Qualitative Analysis for a Refining Process mayo/jun. 2015 15/09/2015 ; 15/09/2015 13 p. ; 497-510 Transcripción del resumen del autor: Two-phase flow in pipes occurs frequently in refineries, oil and gas production facilities and petrochemical units. The accurate design of such processing plants requires that numerical algorithms be combined with suitable models for predicting expected pressure drops. In performing such calculations, pressure gradients may be obtained from empirical correlations such as Beggs and Brill, and they must be integrated over the total length of the pipe segment, simultaneously with the enthalpy-gradient equation when the temperature profile is unknown. This paper proposes that the set of differential and algebraic equations involved should be solved as a Differential Algebraic Equations (DAE) System, which poses a more CPU-efficient alternative to the "marching algorithm" employed by most related work. Demonstrating the use of specific regularization functions in preventing convergence failure in calculations due to discontinuities inherent to such empirical correlations is also a key feature of this study. The developed numerical techniques are then employed to examine the sensitivity to heat-transfer parameters of the results obtained for a typical refinery two-phase flow design problem. 3 Oil and Gas Science and Technology 70 ARTICULO ddc 189215 189215 0 0 0 0 257034 BAAB BAAB 2026-03-06 200061447 0 200061447 2026-03-06 00:19:26 2026-03-06 ARTICULO