Signal processing for slug flow analysis via a voltage or instantaneous liquid holdup time-series

Signal processing for slug flow analysis: MATLAB algorithm

“…This is because the delay between them is a fundamental parameter for the translational velocity estimation and the slug lengths. Each signal is processed following the methodology described in [ 1 ]. The procedure starts fitting an empirical density function to the time series and identifies the boundary between slug and film regions ( Fig.…”

“…The experimental conditions come from MyExperiments. As mentioned in [ 1 ], translational velocity is calculated using the cross-correlation between the normalized signals (C21, Table 2 ). Also, using the cross-correlation of the digital signals, the front, and rear vectors, the code calculates the body, front and rear velocities (C17-C19, Table 2 ).…”

“…The slug frequency for each signal (Fs, C25, and C37, Table 2 ) are calculated using the number of slug pulses counted by the code and the total test time. As mentioned in [ 1 ], a good estimation of the slug frequency is given by the frequency corresponding to the highest normalized magnitude obtained by the power density spectrum technic (PDS 1: C28 and C40, Magnitude of PDS 1: C31 and C43, Table 2 ). As complementary information, the second and third PDS frequencies and magnitudes are reported.…”

“…The concept development of the signal processing methodology reported in [1] started in 2014 as a project of the Tulsa University Fluid Flow Projects (TUFFP) [2 , 3] . The method is inspired by the studies of Kouba [4] and Al-Safran [5] .…”

“… This paper presents an easy-to-use MATLAB© program to characterize slug flow, one of the most observed gas-liquid flow patterns in pipes. “BSignalProcessing2020.m” based on the study reported in [1] is a flexible, expandable, and adaptable statistical algorithm used to calculate the film and slug cut threshold values, the disregard cut value to group slug pulses, and the disregard cut value to remove slug pulses, which are required to determine the slug characteristics. The code is provided for unlimited and unrestricted use.…”