In the above paper, the energy equation (see Eq. (3) in Ref. [1]) is as follows:

where T is the fluid temperature, t is the time, u and v are the velocity components in the x and y directions, respectively, ρ is the fluid density, cp is the specific heat, κ is the thermal conductivity, and Φ is the heat source.

The units of temperature are
The units of time are

Therefore, the units of (Φ/ρcp) are Ks1 in order that this term is compatible...

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