A vertical array of circuit boards is immersed in quiescent ambient air at T_∞ = 17°C. Although the components protrude from their substrates, it is reasonable, as a first approximation, to assume flat plates with uniform surface heat flux q;. Consider boards of length and width L = W = 0.4 m and spacing S = 25 mm. If the maximum allowable board temperature is 77°C, what is the maximum allowable power dissipation per board?

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T5L Circuit boards L.