Greek Characters
\(\beta_{o},\beta_{1}\) = coefficient in the least square error method.
\(\overset{\overline{}}{\epsilon_{\text{Rev}}}\) = revised mean relative error after machine learning algorithm was implemented.
θ  = the incident angle of ultrasound wave.
\(\mu_{f}\) = fluid viscosity (Pa.s)
\(\nu\) = kinematic viscosity (m2/s).
\(\rho_{f}\) = density of fluid (kg/m3).
\(\rho_{s}\) = density of solids (kg/m3).
\(\rho_{p}\) = density of particle (kg/m3).
\(\rho_{m1}\) = density of initial mud or fresh water (kg/m3).
\(\rho_{m2}\) = density of final mixture (kg/m3).
\(\sigma_{v}\) = standard deviation of flow velocities (m/s).
\(\sigma_{\text{Test\ \ }}\) = standard deviation of relative error of test data set.
\(\sigma_{\text{Rev\ \ }}\) = revised standard deviation of relative error after machine learning algorithm was implemented.