I will solve heat transfer problem. But the temperature is fictitious dimensionless. So I want to know hot to input dimensionless temperature of inlet flow. Of course, density, conductivity and specific heat are also dimensionless.

Thanks in advance.

All you have to do is to make sure you're matching the relevant parameters such as Prandtl number and Rayleigh number, and use proper non-dimensional quantities when comparing the results with the data or correlations.

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