高压静电场下固体颗粒床沸腾传热特性OA

To address the issues of low critical heat flux density and insufficient bubble nucleation du-ring the boiling process of porous structures in solid particle beds,the active electric field enhancement technology was employed to investigate the boiling heat transfer performance of flat-laid solid particle beds on a heated surface.AE-3000 dielectric fluid was selected as the boiling working fluid,and the effects of different electrode configurations on the boiling heat transfer characteristics were analyzed.The boiling heat transfer performance of adding solid particles of different sizes and with different num-bers of solid particle layers to the heating surface under the action of an electric field was also explored.The results show that the high-voltage electrostatic field can significantly reduce the initial superheat during the nucleate boiling phase of the solid particle bed.In the medium-to-high heat flux region,adding 5 mm flat-laid solid particles to the heated surface can cause oscillation and bouncing under the action of bubble buoyancy,promoting liquid reflux and bubble detachment,giving better boiling heat transfer performance than solid particles of other sizes.Meanwhile,the electrostatic field can effectively postpone the onset of the critical heat flux density on the solid particle-bed surface.The higher the ap-plied voltage,the better the enhancement of the critical heat flux on each solid particle surface,with a maximum improvement of 72.0%compared with the case without an electric field.In addition,it is found that adding a three-layer flat-laid solid particle bed on the heated surface under an electric field yields the best boiling heat transfer performance,with the boiling heat transfer coefficient increasing by 58.1%compared with a smooth copper surface.