Abstract
Computational fluid dynamics (CFD) analysis of single- phase and two-phase flow was performed in a 90 degree horizontal to vertical elbow with 12.7 mm inside diameter. Characteristic flow behavior was investigated at six different upstream and downstream locations of the elbow. To evaluate the effects of different phases, three different air veloci-ties and three different water velocities were used during this study. Commercial CFD code FLUENT was used to perform analysis of both single and multiphase flows. Pressure and velocity profiles at six locations showed an increase in pressure at the elbow geometry with decreasing pressure as fluid leaves from the elbow. Pressure drop behavior observed to be similar for single-phase and multiphase flows. Comparison of CFD results with available empirical models showed reasonably good agreement.
Highlights
A phase can be defined as one of the states of matter such as gas or liquid, solid
Computational fluid dynamics (CFD) analysis of single- phase and two-phase flow was performed in a 90 degree horizontal to vertical elbow with 12.7 mm inside diameter
The top of each individual contour diagram represents the inner wall of the elbow and the bottom part of the contour represents the outer wall of the elbow
Summary
A phase can be defined as one of the states of matter such as gas or liquid, solid. Multiphase flow is the simultaneous flow of several phases, with two phase flow being the simplest case. Spedding [2] measured the pressure drop in curved pipes and elbow bends for both laminar and turbulent single phase flow and developed empirical correlations. The transitional Reynolds numberfor curved pipesof large bends was determined using empirical relation Another model for pressure drop in two- phase upward flow in 90 degree bend was proposed by Azzi [3]. In his model the scatter of the logarithmic ratios of the experimental and the predicted values amounts to about 25% and is substantially lower than that observed with selected models recommended in the literature.
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