Developing a Generalized Combined Model for Gas-liquid Two-phase Flow Pressure Drop in Elbow Bends

N.Z Aung (Department of Mechanical Engineering, Mandalay Technology University)
T Yuwono (Laboratory of Fluid Mechanics, Department of Mechanical Engineering, Institute Technology Sepuluh Nopember, Campus ITS, Sukolilo, Surabaya)

ASEAN Journal on Science and Technology for Development
Vol. 29 No. 2 (2012): ASEAN Journal on Science and Technology for Development (AJSTD)

In this work, a generalized combined model was proposed for prediction of two-phase flow pressure drop in elbow bends. In this proposed model, restriction, frictional and elevational losses were considered separately. The frictional and static losses were approached by using Lockhart_Martinelli correlation. This model was tested to predict the pressure drop across the elbows with inside diameter of 0.036 m and R/D = 0.6, 2.5. The superficial liquid velocity was varied in the range of0.3~1.1 m/s and volumetric gas quality was varied from 0.02~0.3. The results from this model had good predictions with a maximum error of ±13% for long elbow bends and showed great discrepancy with a peak error of –50% for short elbow bends. The model is reliably acceptable for the elbow bends with relative radius (R/D) greater than 2 at volumetric gas fractions less than 0.3.