Dittus-Boelter equation cannot be used for molten metals mainly due to its very low

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The Dittus-Boelter equation is not suitable for molten metals primarily because of their very low Prandtl number. The Prandtl number is a dimensionless number that signifies the ratio of momentum diffusivity (viscosity) to thermal diffusivity. For molten metals, this number is typically very low due to their high thermal conductivity, which affects the applicability of the Dittus-Boelter equation in predicting the convective heat transfer coefficient accurately.

Dittus-Boelter Equation Cannot Be Used for Molten Metals Mainly Due