To simulate the heat and mass transfer in micronano heterogeneous systems,such as metalproduction processes and lubrication,the point contact condition with the formation of narrowly confined water/oil meniscus was constructed to study the classical micro channel boiling problem.The evaporation and diffusion of the superheated water meniscus and water/oil droplet in the point contact geometry were investigated,and the influence of the contact line transport behaviors on the nucleation and bubble behaviors in the confined meniscus was analyzed.The observations suggest that superheat is the necessary condition for bubble formation and enough vapor supply is the necessary condition for bubble growth in the confined liquid.The oil film can significantly inhibit the evaporation and diffusion of water molecules in the superheat geometry.The water/oil droplet can exist for a long time even in the hot confined space of 200 ℃,which has sustained damages to the mechanical system suffering from water contamination.