please help me to write the following equation for temperature gradient in ANSYS CFX

T=5.0265*Z-3.4559

I will use this equation on the wall of geothermal heat exchanger. Thanks

(5.0265*z/1[m]-3.4559)*1[K]

This will work, but I recommend using the right units for your constants rather than making the expression unitless and forcing it to Kelvin afterward.

Unit conversion is major benefit of CEL is that you can use your dimensional data directly and allow CFX to do the unit conversion. This is a lot less error prone than doing what Georg suggested.

-CycLone