Background: Micro-bubble Emission Boiling (MEB) is a special subcooling boiling phenomenon that the heat flux increases more highly than critical heat flux (CHF). Due to its extremely high heat transfer capability

many researchers have shown interest in it. Purpose: In this paper

we fit the heat transfer correlation of experimental data collected in visualized boiling experiments after deeply analyzing the heat transfer mechanism of MEB. Methods: Four Si-C heaters were employed for heating the copper block

which has a round heating surface with diameter of 10mm on its upper. Temperature data were measured by T-type sheathed thermocouples. The temperature of the heating surface was obtained by extrapolating the temperature distribution. Based on the heating surface temperature date in different subcoolings

least square method was used to fit Rohsenow relation to MEB. Bubble behaviors were captured by high-speed video camera with light system. Results: The experimental results showed that

when the subcooling exceeded 40 K

disturbance emerged at the liquid-vapor interface and the micro-bubble emission boiling occurred after the CHF was attained

thereafter the heat flux increased rapidly with the superheat increasing like that in typical nucleate boiling region. Based on Rohsenow relation

MEB heat transfer correlation is fitted according to the measured temperature data for heating surface of 10-mm copper in different subcoolings. The error of the relation is less than ±15%

which meets the requirement of general engineering. Conclusion: The efficient convective heat transfer of vapor-liquid replacement caused by periodic damage of the unsteady vapor film on the heating surface is the heat transfer mechanism of MEB. Abstract