This lesson covers the concept of critical heat flux, focusing on the hydrodynamic theory of critical heat flux. It explains how critical heat flux occurs on any boiling surface, with a detailed discussion on flat surfaces. The lesson also elaborates on the formation of vapour and its escape pattern, the concept of Taylor and Kelvin Helmholtz instabilities, and the calculation of critical heat flux. It further discusses the assumptions made in the hydrodynamic model of critical heat flux and the limitations of this model. The lesson concludes with an overview of film boiling and transition boiling.

- Critical heat flux occurs on any boiling surface and is particularly convenient to discuss on flat surfaces.
- The formation of vapour and its escape pattern play a crucial role in understanding critical heat flux.
- Taylor and Kelvin Helmholtz instabilities are key concepts in the study of critical heat flux.
- The hydrodynamic model of critical heat flux, while useful, is based on certain assumptions and has its limitations.

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