Critical heat flux during transient boiling of water on a vertically oriented heater

The results of an experimental determination of the critical heat flux during transient boiling of water on a steel surface due to a rapid heat release are presented. The experimental conditions were as follows: average upward water flow velocity of 0.52 m/s, initial pressure of 0.29 MPa, and liquid subcooling relative to the saturation temperature of 23, 53, and 103 K. It is shown that the influence of the surface heating rate on reaching the temperature corresponding to the onset of boiling crisis is nonlinear.