The additional inertial forces caused by rolling conditions would affect the two-phase flow pressure drop and the forces acting on the bubbles.Numerical simulation of subcooled flow boiling in a vertical rectangular channel under the effect of additional inertial forces has been carried out considering the energy and mass transfer during phase change.The two-phase flow model of volume-of-fluid (VOF) was adopted.The liquid-vapor interface was captured using the piecewise linearity interpolation calculation (PLIC) geometry restructuring method.The pressure

velocity

temperature distribution around an isolated bubble

the secondary flow phenomenon caused by evaporation and condensation

and the evolution of velocity vector during bubble coalescence were obtained

which agree well with the results in literature.Compared with motion less conditions

the pressure drop was enlarged by the effect of additional inertial forces.In subcooled flow boiling

the pressure drop fluctuates because of the vapor generation.The fluctuation becomes more severe while heat flux increases.Compared with the effects of other forces acting on bubbles

the effect of additional inertial forces can be neglected.However

the fluctuation of flow rate caused by rolling would change the shear lift force

drag force and hydrodynamic pressure force significantly and influence the heat transfer in boiling flow.