## 6 Results and Discussion
The logic for this is the elevated value of thermal conductivity of SWCNTs (6600 Wm\({}^{-1}\)/k\({}^{-1}\)) as opposed to MWCNTs (3000 Wm\({}^{-1}\)/k\({}^{-1}\)), as given in Figure 5:0  
Figure 5:1 Effect of the Biot number \(\lambda\) on the temperature field \(\Theta(\eta)\). Figure 5:2 Effect of the heat generation/absorption parameter \(Q_{tt}\) on the temperature field \(\Theta(\eta)\). Physical values such as the skin friction co-efficient \(\left(C_{f}\right)\) and the Nusselt number \(\left(Nu\right)\) for the engineering purposes are calculated through Tables 3 and 4, respectively. Table 3 presents the numerical values of skin friction \(\left(C_{fx}\right)\) and \(\left(C_{fy}\right)\). It can be observed that the large values of \(M,\ \ \varphi\) and \(\beta\) increase the skin friction \(\left(C_{fx}\right)\) and \(\left(C_{fy}\right)\) of both SWCNTs and MWCNTs, where the large value of \(K\) reduces the skin friction \(\left(C_{fx}\right)\) of both SWCNTs and MWCNTs and increases skin friction along the y-axis \(\left(C_{fy}\right)\). Table 4 presents the numerical results of the Nusselt number \(\left(Nu\right)\). It can be noted that the large values of \(M\) and \(K\) increase the \(\left(Nu\right)\) of both SWCNTs and MWCNTs, where the large values of \(\lambda,\,Rd\) and \(Q_{h}\) reduce the Nusselt number of both SWCNTs and MWCNTs. \begin{table}
\begin{tabular}{c c c c c} \hline \hline \multirow{2}{*}{**Physical Properties**} & \multirow{2}{*}{\begin{tabular}{c} **Density** \\ \(\rho\)**(kg/m\({}^{3}\))** \\ \end{tabular} } & \multirow{2}{*}{\
\begin{tabular}{c} **Thermal Conduct** \\ \(k\)**(W/mk)** \\ \end{tabular} } & \multirow{2}{*}{
\begin{tabular}{c} **Specific Heat** \\ \(\mathbf{c_{p}}\)**(kg\({}^{-1}\)/k\({}^{-1}\))** \\ \end{tabular} } \\ \hline \multirow{3}{*}{Base fluid} & Water & 997 & 0.613 & 4197 \\  & Kerosene (lamp) oil & 783 & 0.145 & 2090 \\  & Engine oil & 884 & 0.144 & 1910 \\ \hline \multirow{3}{*}{Nanoparticles} & SWCNT & 2600 & 6600 & 425 \\  & MWCNT & 1600 & 3000 & 796 \\ \hline \hline \end{tabular}
\end{table} 
Table 1: The thermo physical properties of carbon nanotubes (CNTs) of some base fluids. SWCNT: single-walled carbon nanotube; MWCNT: multi-walled carbon nanotube \begin{table}
\begin{tabular}{c c c} \hline \hline \multirow{2}{*}{**Volume Fraction \(\varphi\)**} & \multirow{2}{*}{\
\begin{tabular}{c} **Thermal Conductivity \(k_{nf}\)** \\ **for SWCNT** \\ \end{tabular} } & \multirow{2}{*}{
\begin{tabular}{c} **Thermal Conductivity \(k_{nf}\) for** \\ **MWCNT** \\ \end{tabular} } \\ \hline
0 & 0.145 & 0.145 \\
0.01 & 0.174 & 0.172 \\
0.02 & 0.204 & 0.2 \\
0.03 & 0.235 & 0.228 \\
0.04 & 0.266 & 0.257 \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Thermal conductivity values of CNTs with different volume fraction values. \begin{table}
\begin{tabular}{c c c} \hline \hline \multirow{2}{*}{**Volume Fraction \(\varphi\)**} & \multirow{2}{*}{\
\begin{tabular}{c} **Thermal Conductivity \(k_{nf}\)** \\ **for SWCNT** \\ \end{tabular} } & \multirow{2}{*}{
\begin{tabular}{c} **Thermal Conductivity \(k_{nf}\) for** \\ **MWCNT** \\ \end{tabular} } \\ \hline
0 & 0.145 & 0.145 \\
0.01 & 0.174 & 0.172 \\
0.02 & 0.204 & 0.2 \\
0.03 & 0.235 & 0.228 \\
0.04 & 0.266 & 0.257 \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Numerical data of the skin-friction coefficient for dissimilar values of \(M,\ K,\ \varphi\), and \(\beta\).