Boiling curves, representing the heat flux vs. the temperature-difference driving force, can be computed from unsteady-state quenching tests. An inverse conduction calculation is used. For spheres and horizontal flat plates, the geometry and test conditions required to achieve boiling curves, which are equivalent to those obtained by steady-state tests and which are not sensitive to modest changes in geometry, are described. Such curves are useful for the design of commercial heat exchangers. A significant parameter for standardization is the Taylor hydrodynamic wavelength, or alternatively the bubble size at break-off.

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