Volume 22: Sustainable Energy Solutions for a Post-COVID Recovery towards a Better Future: Part V

A New Two-Phase Friction Multiplier Approach for Annular Flow in Helically Coiled Tube Bonfil García Abel, Colorado-Garrido Dario, Silva-Aguilar Oscar F., Herrera Romero J. Vidal

Abstract

This study considers the prediction of the two-phase frictional pressure drop with water–steam flows through helically coiled steam generator, special emphasis is given to the annular flow present in helical systems. An empirical correlation based on the Lockhart-Martinelli parameter is proposed and fitted using an experimental pressure drop database containing 698 points. A new pressure drop correlation for helically tubes is proposed to increase prediction and knowledge in this class of systems, selecting only annular flow data. The new correlation is suitable for the following operation variables, the mass flux in the range of 192 to 810 kg/(m^2 s), the quality from 0.13 to 0.89, the pressure from 1.7 to 6.3 MPa and heat flux from 43.68 to 232.87 kW/m^2

Keywords Lockhart-Martinelli parameter, steam generator, flow pattern, thermo-hydraulic analysis, energy science