The Stanton number ($St$) is a dimensionless parameter used in fluid mechanics and heat transfer to characterize the convective heat transfer rate in a fluid flow system. It represents the ratio of convective heat transfer to conductive heat transfer, similar to the Sherwood number for mass transfer. The Stanton number can be expressed mathematically as:

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Where:

• $St$ is the Stanton number.
• $h$ is the convective heat transfer coefficient, 
• $\rho$ is the density of the fluid, 
• cp​ is the specific heat capacity of the fluid.