When the spray volume flux is sufficiently high, droplets having impinged on the heater surface coalesce each other and form liquid films covering a significant proportion of the surface even in a superheat range close to the CHF point. Because of the dimensions of those liquid films far exceeding those of impinging droplets, the configurations and behavior of the films are presumably under the influence of gravity. If this is the case, the heat transfer in a liquid-film-dominating region including the CHF point should inevitably be dependent on gravity.
　　In the film boiling region, droplets sprayed onto the heater surface split into tiny fragments instead of coalescing each other. (Note that We > 600 in the experiments of the present concern.) Those fragments - disintegrated droplets - presumably evaporate away in the vicinity of the heater surface irrespective of the level of gravity. Consequently gravity effect is vanishing in the film boiling region.

FC-72 (Reduced and Elevated Gravity/Low Spray Volume Flux)
　　Figure 10 shows the heat transfer characteristics observed with FC-72 sprayed onto the glass-prism heater under reduced and elevated gravity conditions. The range of the experiments is limited to the nuclear boiling region below the CHF point. Here we hardly recognize any gravity effect on the heat transfer. Figure 11 shows two rear-side views of the heater surface upon which a heat flux close to the CHF was imposed - one obtained under the reduced gravity and the other under the elevated gravity. Again we find little difference between these views. It seems that droplets having impinged on the heater surface immediately evaporate, rarely causing mutual interaction and thereby experiencing little gravity effect.