Consider a thin, 50 mm X 50 mm fuel cell similar to that of Example 1.5, with air in parallel flow over its surfaces. Very small-diameter wires are stretched across both sides of the fuel cell at a distance x = xc from the leading edge in order to trip the flow into tur- bulent conditions. Using an appropriate correlation from Chapter 7, determine the minimum velocity needed to sustain the fuel cell at Tc = 77°C, and the associated location of the wire. The air and large sur- roundings are at Too = Tsur = 27°C and the fuel cell dissipates Eg = 11 W. The fuel cell emissivity is s = 0.85.