*Article* **Impact of Thermal Radiation on Magnetohydrodynamic Unsteady Thin Film Flow of Sisko Fluid over a Stretching Surface**

#### **Abdul Samad Khan 1,\*, Yufeng Nie 1 and Zahir Shah 2**


#### Received: 5 May 2019; Accepted: 3 June 2019; Published: 12 June 2019

**Abstract:** The current article discussed the heat transfer and thermal radioactive of the thin liquid flow of Sisko fluid on unsteady stretching sheet with constant magnetic field (MHD). Here the thin liquid fluid flow is assumed in two dimensions. The governing time-dependent equations of Sisko fluid are modeled and reduced to Ordinary di fferential equations (ODEs) by use of Similarity transformation with unsteadiness non-dimensionless parameter *St*. To solve the model problem, we used analytical and numerical techniques. The convergence of the problem has been shown numerically and graphically using Homotopy Analysis Method (HAM). The obtained numerical result shows that the HAM estimates of the structures is closed with this result. The Comparison of these two methods (HAM and numerical) has been shown graphically and numerically. The impact of the thermal radiation *Rd* and unsteadiness parameter *St* over thin liquid flow is discovered analytically. Moreover, to know the physical representation of the embedded parameters, like β, magnetic parameter M, stretching parameter ξ, and Sisko fluid parameters ε have been plotted graphically and discussed.

**Keywords:** Sisko fluid; unsteady stretching sheet; thin films; MHD; HAM and numerical method
