Consider the steady, two-dimensional flow of a nanofluid near the stagnation point on a stretching sheet saturated at a porous surface (highly permeable) as shown in Fig. 9.14 [21]. The stretching velocity U_{w}(x) and the free stream velocity U_{∞}(x) are assumed to vary proportional to the distance x from the stagnation point, that is, U_{w}(x) = ax and U_{∞}(x) = bx, where a and b are constants with a > 0 and b ≥ 0. It is assumed that the temperature at the stretching surface takes the constant values T_{w}, while the temperature of the ambient nanofluid, attained as y tends to infinity, takes the constant values T_{∞}. The fluid is a water-based nanofluid containing ...

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