The fuel rods in an experimental nuclear reactor are arranged in a rectangular pattern, as shown in the Figure P7.9. The fuel rod diameter is 1.14 cm, and the pitch is Pitch = 1.65 cm. The rod bundle...

The fuel rods in an experimental nuclear reactor are arranged in a rectangular pattern, as shown in the Figure P7.9. The fuel rod diameter is 1.14 cm, and the pitch is Pitch = 1.65 cm. The rod bundle is 3.66 m tall. Assume that the core operates at 6.9 MPa, and the water temperature at inlet is 544 K. Heat flux on the fuel rod surface is uniform and equal to 6.31 × 10⁴
W/m2 . The flow is assumed to be 1D, and the mass flow rate through a unit cell is 0.15 kg/s. Estimate the fuel rod surface temperature at x = 10 cm, x = 25 cm, and x = 50 cm locations.