The film boiling heat transfer of liquid hydrogen was investigated

and the associated film boiling heat transfer experimental data in literatures were selected and analyzed. To validate the applicability and the predictive accuracy of three typical correlations for calculating heat transfer coefficient of film boiling events

a series of comparative studies were conducted. Moreover

a mathematical correlation was proposed to predict the film boiling heat flux of liquid hydrogen under microgravity. It was concluded that under the normal gravity condition

the heater geometries and their directions cannot significantly influence the film boiling heat flux of liquid hydrogen

and Breen & Westwater correlation was recommended to predict the heat transfer coefficient. Analysis of the experimental data shows that gravity has a significant influence on the film boiling heat transfer

and a power law correlation could be obtained to link the heat flux under different gravity conditions. In addition

a comparative study shows the proposed power law correlation allows to get the film boiling heat flux under any gravity condition as long as the heat flux under a similar reference condition has been known

and the predictive deviation is within 15%.