Abstract: To investigate the influence mechanism of synthetic dual-jet active control technology on heat transfer characteristics and critical heat flux (CHF) during pool boiling, this study employs the pseudo-potential lattice Boltzmann method (LBM) to conduct numerical simulations of pool boiling under the control of a synthetic dual jet. This research aims to provide theoretical foundations for developing highly efficient and reliable boiling heat transfer enhancement techniques. First, the operating principle and flow characteristics of the synthetic dual jet are introduced, followed by a description of the hybrid thermal pseudopotential LBM model employed. Building upon this, a simplified two-dimensional pool boiling framework was established. Simulations were conducted for both uncontrolled and controlled conditions, yielding corresponding boiling curves. The results demonstrate that within a reasonable jet velocity range, the synthetic dual jet significantly enhances the critical heat flux (CHF) and stabilises nucleate boiling over a broader superheat range. The CHF exhibits a non-monotonic variation with jet velocity, initially increasing before decreasing. This phenomenon is attributed to the suppression of bubble nucleation caused by the spatiotemporal in-homogeneity of pressure induced by the jet. Within the studied parameter range, the CHF reaches its maximum value at a jet velocity of 0.04 lu/ts, representing an approximately 16.4% improvement compared to the uncontrolled condition. Further analysis indicates that increasing jet velocity broadens the superheat range for nucleate boiling and effectively suppresses the abrupt heat flux drop during the transition from nucleate to film boiling, thereby mitigating boiling crises. This study elucidates the mechanism by which synthetic dual jets influence the boiling process, offering valuable guidance for developing highly efficient active boiling enhancement techniques.

Key words: Synthetic dual jet, Pool boiling, Boiling curve, Critical heat flux (CHF), Lattice Boltzmann method (LBM)