Abstract
An experimental program was performed to investigate departure from nucleate boiling (DNB) in a flow boiling system heated by a liquid metal flow. The boiling fluid, freon 12, was circulated vertically upward and was heated by countercurrent flowing mercury. Magnitudes and trends of the heat flux and quality at DNB were compared to data obtained on a similar experimental facility employing uniform electrical heating of the test section wall. The results show that at a given quality, the magnitude of the DNB heat flux is larger in the case of uniform electrical heating. This result is not predicted by a DNB correlation based on data obtained from electrically heated test sections employing uniform and non-uniform axial heat flux distributions. It is demonstrated that the DNB phenomenon in a temperature controlled system (liquid metal heated) may not be well predicted from correlations based on data (uniformly or nonuniformly heated) obtained from heat flux controlled systems (electrically heated).
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