**7. Discussion**

This area is dedicated to the conversation and expectation of the effects of numerous parameters modeled from Equation (2) on *f* (η). The impact of *M*, φ, *Nr*, *Rb*, *k*1, β on velocity profile is discussed. Figure 2 presents the effect of the solid volume fraction (φ) of Maxwell micropolar nanofluid on velocity function. The motion of the nanoparticle increases for enlarging values of (φ). It is noted that *f* (η) increases quickly for SWCNT in comparison to MWCNT. This augmentation in a motion of the micropolar nanoparticle is noted faster for single-wall carbon nanotube as compared to the multiwall carbon nanotube. Figure 3 presents the influence of *M* on *f* (η). The converse disparity is seen amongst *M* and *f* (η). The impact of the magnetic force is perpendicular to the Maxwell micropolar nanofluid flow direction executes augment to a resistive force. For a larger value of magnetic parameter (*M*), the Lorentz forces enhance which raises the forces of resistance of the Maxwell micropolar motion which in turn reduces velocity *f* (η). Figure 4 presents the impact of a suction parameter *V*<sup>0</sup> on *f* (η). Here it is obvious from Figure 4, that enlarged estimation of the *V*<sup>0</sup> reduces the SWCNTs and MWCNTs Maxwell nanofluid motion. The impression of the buoyancy proportion parameter *Nr* for SWCNTs and MWCNTs on *f* (η) is presented in Figure 5. It is the ratio of nanofluid concentration and temperature difference amongst the layers as well as the intended operative resistance ratio at diverse values of β. From mathematical relation of *Nr* it is clear that increasing concentration difference (C*W*–C0) augmented *Nr*, while increasing temperature difference (*Tf*–*T*0) enhances *Nr* Therefore, the augmented *Nr* reduced the fluid motion. The impact of bio-convection Rayleigh number *Rb* in Figure 6 as *Rb* is a dimensionless number related to the buoyancy-driven of Maxwell micropolar nanofluid flow. From Figure 6 it is cleared that augmented value Rayleigh number *Rb* reduced the Maxwell micropolar nanofluid motion. It is also found that velocity for MWCNT declines more quickly. In Figure 7, the result of the permeable parameter *k*<sup>1</sup> on *f* (η) is drawn. As it is obvious that the permeable medium creates resistance to the fluid motion. From the figure it is perceived that *f* (η) is decreases with higher permeability *k*1. Additionally, the momentum boundary layer reduces with enhances value of *k*1.

**Figure 2.** The variation of the velocity distribution profile *f* (η) for the case of SWCNT and MWCNT versus the similarity variable for the distinct values of the nanoparticle volume fraction (φ).

**Figure 3.** The variation of the velocity distribution profile *f* (η) for the case of SWCNT and MWCNT versus the similarity variable for the distinct values of the magnetic parameter (*M*).

**Figure 4.** The variation of the velocity distribution profile *f* (η) for the case of SWCNT and MWCNT versus the similarity variable for the distinct values of the suction parameter (*V*0).

**Figure 5.** The variation of the velocity distribution profile *f* (η) for the case of SWCNT and MWCNT versus the similarity variable for the distinct values of the buoyancy ratio parameter (*Nr*).

**Figure 6.** The variation of the velocity distribution profile *f* (η) for the case of SWCNT and MWCNT versus the similarity variable for the distinct values of the bio-convection Rayleigh number (*Rb*).

**Figure 7.** The variation of the velocity distribution profile *f* (η) for the case of SWCNT and MWCNT versus the similarity variable for the distinct values of the porous parameter (*k*1).

#### *7.1. Temperature*

The substantial impacts of numerous factors displayed from temperature Equation (3) similar (*B*1), (M), (*Rd*), and (*Ec*) on temperature distribution profile are shown in Figures 8–11. The impression of Biot number *B*<sup>1</sup> on temperature distribution function θ(η) is presented in Figure 8. It is seen for the higher value of *B*<sup>1</sup> the temperature function θ(η) augmented for CNTs Maxwell micropolar nanofluid. Actually, increasing *B*<sup>1</sup> enhances the heat transmission from the surface becomes equivalent to that added from the exposed field which, in turn, conquers the temperature upsurge at the surface. Figure 9 labeled the impression of radiative parameter *Rd* on the temperature distribution field θ(η) Augmentation in the θ(η) with enhancement radiation parameter *Rd* is observed. Actually, intensification radiation causes additional heat which in turn escalates the CNTS Maxwell micropolar nanofluid temperature. Relation between Eckert number *Ec* and temperature distribution θ(η) is illustrated in Figure 10. Higher value of *Ec* amplified the kinetic energy of CNTs Maxwell micropolar nanofluid molecules which thus, enhanced the warmth transmission rate. Figure 11 shows the influence of magnetic induction *M* on temperature distribution θ(η). For higher (M) the strength of Lorentz forces become stronger which enhances the contrasting forces to the Maxwell micropolar nanofluid and results in the temperature distribution being θ(η) enhanced.

**Figure 8.** The impact of the temperature distribution profile θ(η) for the case of SWCNT and MWCNT versus the similarity variable for the distinct values of the Boit number (*B*1).

**Figure 9.** The impact of the temperature distribution profile θ(η) for the case of SWCNT and MWCNT versus the similarity variable for the distinct values of the radiation parameter *Rd*.

**Figure 10.** The impact of the temperature distribution profile θ(η) for the case of SWCNT and MWCNT versus the similarity variable for the distinct values of the Eckert number *Ec*.

**Figure 11.** The impact of the temperature distribution profile θ(η) for the case of SWCNT and MWCNT versus the similarity variable for the distinct values of the magnetic parameter *M*.
