*4.3. Thermal Analysis*

In this section, the temperature of nanofluid was examined vertical to the disk. The mathematical relationships for temperature and temperature gradient were respectively denoted by the following relations:

$$T(z,t) = \frac{R^2}{2}\Gamma(z,t) + \tau(z,t) \tag{60}$$

$$T\_z(z,t) = \frac{R^2}{2} \Gamma\_z(z,t) + \tau\_z(z,t) \tag{61}$$

*Coatings* **2018**, *8*, 422

Here smooth and organized curves are drawn in Figures 22–27. It is found that an addition of extra nanoparticles strengthens the drag force between the particles. However, thermocapillary parameter α works altogether differently by reducing the heat of the nanofluid that ultimately affirms the earlier preceding claim regarding the addition of metallic particles to the base fluid ethanol.

**Figure 22.** Temperature effects of concentration particles.

**Figure 23.** Temperature effects of concentration particles.

**Figure 24.** Variation of *Tz* for the thermocapillary parameter.

**Figure 25.** Variation of *Tz* for the thermocapillary parameter.

**Figure 26.** Variation of *Tz* on concentration particles.

**Figure 27.** Variation of *Tz* on concentration particles.
