“…For the purpose of exploring the potential and applicability of data driven models for mass flow rate measurement of solids under different air velocities, all the other physical parameters such as pipe orientation and environmental conditions are kept constant. However, the data driven models can also be generalized for different pipe orientations and environmental conditions, provided they are trained with the data under the correct wide range of pipe orientations, ambient temperatures and relative humidity under which the sensors are to be installed for practical applications [16,22].…”