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7.11. Observations

We have presented a summary of CHF with an emphasis on the fundamental mechanisms of CHF. It is important to remember that one must use empirical correlations only within their range of applicability, and if correlations do not exist to use available data in a manner suggested to develop the engineering correlations. One area which has little data to support development is transient critical heat flux (e.g., Moxon and Edwards (1967)). The general observation from this limited data is that tex2html_wrap_inline5074 under transient conditions tends to be larger than CHF under similar steady-state conditions. It is therefore recommended that consideration of CHF being exceeded under transients (flow or power) be based on local conditions and employing appropriate steady state correlations.

References


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Next: POST-CHF HEAT TRANSFER Up: BURNOUT AND THE CRITICAL Previous: CHF Estimates for Nonaqueous


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