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## 7.3. Magnetic nanofluid forced convective heat transfer in the existence of variable magnetic field using two-phase model

### 7.3.1. Problem definition

The schematic diagram and the mesh of the semiannulus enclosure used in the present CVFEM program are shown in Fig. 7.16 [7]. The inner wall is maintained at constant temperatures Th and the other walls are maintained at constant temperature Tc (Th > Tc). The boundary conditions for concentration are similar to those of temperature. For the expression of the magnetic field strength, it can be considered that the magnetic source represents a magnetic wire placed vertically to the xy plane at the point $Math Equation$. The components of the magnetic field intensity $Math Equation$ and the magnetic field strength $Math Equation$

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