Vibration can enhance the hydrothermal performance by disturbing the thermal boundary layer. Also, the
magnetic field increases the ferrofluid mixing, thereby enhancing the heat transfer rate. In this study, an
experimental analysis of ferrofluid flow inside a rifled tube under the vibration and rotational magnetic field
(RMF) effects was conducted by considering different Reynolds numbers (Re), nanoparticle concentrations (φ),
and rifled tube pitches (P). In the first stage, the effect of Re and φ on the hydrothermal performance of the
system in the absence of the vibration and RMF was explored. In the second stage, the effect of vibration on the
performance evaluation criterion (PEC) of the system was investigated. Finally, the RMF effect was considered.
Based on the results, the system with P = 5 mm showed the highest PEC in all experiments. The highest PEC
without the vibration and RMF effects was obtained as 1.62 for P = 5 mm and φ = 0% at Re = 2000. The highest
PEC under the vibration effect (1.28) was also found for Re = 2000 but at φ of 2%, when the highest vibration
acceleration (5 m/s2) was applied. Among the RMFs examined, the RMF with the counter clock-wise along with
the counter clock-wise fluid flow inside the rifled tube resulted in the highest PEC of 1.62. RMF improved the PEC
of the system from 1.28 to 1.62, corresponding to a 21.32% increase, under the vibration.