Confined bubble growth during flow boiling in a mini-/micro-channel of rectangular cross-section part II: Approximate 3-D numerical simulation

Brief Review of Latest Direct Numerical Simulation on Pool and Film Boiling

“…Kunugi [72] conducted the subcooled pool and flow boiling problem by MARS and Ose and Kunugi [73,74] conducted the subcooled pool boiling simulation and validated the numerical results by their visualization experimental data aided by the ultra-high tempo-spatial resolution video camera system [75]. Some recent works on boiling simulation based on the VOF methods have been reported [76~79] and results using the commercial code have also been reported [80,81,82]. However, none of the aforementioned models based on the VOF method include any sub-model for evaporation at the 3-phase contact line.…”

Confined bubble growth during flow boiling in a mini/micro-channel of rectangular cross-section Part I: Experiments and 1-D modelling

“…These are examined in Part II of the paper [27] in an approximate 3-D simulation, using the VOF method implemented in the commercial CFD code FLUENT. This avoids the well-known problems of the VOF method in calculating heat and mass transfer during evaporation at a deformable liquidevapour interface by assuming that bubble growth is driven by gas injection/generation at a rate that matches the bubble growth model in the 1-D model.…”

“…It is more difficult to justify the assumption that the velocities U 1 and U 3 become uniform immediately at each end of the bubble. For this reason, the changes in bubble shape and developing velocity distributions during partial confinement and their influence on the axial pressure distribution are examined by approximate 3-D numerical simulation in Part II [27], where it is shown that the axial pressure distributions predicted by the 1-D and 3-D models for the same bubble growth rate are in good agreement. In the vapour venting condition, when there is no downstream liquid slug, the exit velocity of the vapour is given by…”

An experimental study of two-phase pressure drop of acetone in triangular silicon micro-channels

“…Flow boiling is a highly efficient mode of heat transfer at micro scale [1][2][3]. Flow boiling in micro-channels has many advantages, such as very uniform chip temperatures distribution [4].…”