An experiment was made to investigate the heat transfer to a liquid drop impinging on a hot surface. The transient temperature of the heater surface was measured by a thin-film thermometer. The surface temperature fell to a contact temperature immediately after contact with the drop. The contact temperature increased with increasing initial surface temperature T0. In the case of the water drop, however, it was approximately constant for 200°C ≲ T0 ≲ 300°C; and it increased again for T0 ≳ 300°C. The surface temperature at the turning point, i.e., T0 ∼ 300°C, roughly coincided with the Leidenfrost point.

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