Consider a thin, 50 mm50 mm fuel cell similar tothat of
Chapter 7, Problem 7.42(choose chapter or problem)
Consider a thin, 50 mm50 mm fuel cell similar tothat of Example 1.5, with air in parallel flow over itssurfaces. Very small-diameter wires are stretchedacross both sides of the fuel cell at a distance x?xcfrom the leading edge in order to trip the flow into tur-bulent conditions. Using an appropriate correlationfrom Chapter 7, determine the minimum velocityneeded to sustain the fuel cell at Tc?77?C, and theassociated location of the wire. The air and large sur-roundings are at T??Tsur?27?C and the fuel cell dissi-pates . The fuel cell emissivity is ? .85
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