Which of the following non-dimensional terms is an estimate of Nusselt number?

The correct option is: "Which of the following non-dimensional terms is an estimate of Nusselt number?"

The Nusselt number ($Nu$) is a dimensionless parameter used in the study of convective heat transfer. It represents the ratio of convective to conductive heat transfer across a boundary. Mathematically, it is defined as:
$Nu=\frac{hL}{k}$
where:
• $h$ is the convective heat transfer coefficient,
• $L$ is the characteristic length, and
• $k$ is the thermal conductivity of the fluid.

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