## THERMAL SCIENCE

International Scientific Journal

### THREE-DIMENSIONAL AND TWO-PHASE NANOFLUID FLOW AND HEAT TRANSFER ANALYSIS OVER A STRETCHING INFINITE SOLAR PLATE

**ABSTRACT**

In this work, three-dimensional and two-phase nanofluid flow and heat transfer is modeled over a stretching infinite solar plate. The governing equations are presented based on previous studies. The infinite boundary condition and shortcoming of traditional analytical Collocation Method have been overcome in our study by changing the problem into a finite boundary problem with a new analytical method called Optimal Collocation Method (OCM). The accuracy of results is examined by fourth order Runge-kutta numerical method. Effect of some parameters, Pr (Prandtl number), Sc (Schmidt number), Nb (Brownian motion parameter), Nt (Thermophoresis parameter), λ=b/a (ratio of the stretching rate along y to x directions) and n (power-law index), on the velocities, temperature and nanoparticles concentration functions are discussed. As an important outcome of our 3D model analysis, it is found that increase in thermophoretic forces can enhance the thickness of both thermal and nanoparticle volume fraction boundary layers.

**KEYWORDS**

PAPER SUBMITTED: 2016-06-14

PAPER REVISED: 2016-09-09

PAPER ACCEPTED: 2016-09-12

PUBLISHED ONLINE: 2016-11-06

**THERMAL SCIENCE** YEAR

**2018**, VOLUME

**22**, ISSUE

**2**, PAGES [871 - 884]

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