Abstract
This paper studies prediction of the boiling crisis onset under conditions of the rapid temperature growth of the heat releasing surface washed by a water flow subcooled to the saturation temperature. We obtained experimental data on time delay for rapid vapor formation and showed that the existing technique can be extended to the case with a forced flow. It is shown that the characteristic layer thickness is smaller than the thickness of superheated layer.
Highlights
1 Introduction τind required for the second stage to begin under the conditions of the forced movement of the subcooled water flow
It is known that the stable nucleate boiling is bounded from above by a critical heat flux value, and when this value is reached we can observe a regeneration of vapor structures on the heat releasing surface
If we focus on mechanics of the boiling crisis onset in case of unsteady heat release [2–4], we can establish two important stages: 1. Heating of the near-wall liquid layers to the temperature required to form the first bubble
Summary
1 Introduction τind required for the second stage to begin under the conditions of the forced movement of the subcooled water flow. Heating of the near-wall liquid layers to the temperature required to form the first bubble. The experimental unit comprises a closed isolated circuit with a forced flow equipped with a system that ensures automatic maintenance of the required conditions (temperature, flow rates, liquid pressure).
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