Question: Two 3 cm - diameter thin - walled tubes run parallel, with their centers 5 cm apart. Through one tube flows hot combustion gases at

Two 3 cm-diameter thin-walled tubes run parallel, with their centers 5 cm apart. Through one tube flows hot combustion gases at 800 K, while through the other flows water at 300 K. If both tubes have an emittance of 0.8, calculate the net radiant energy absorbed by the water per meter length of tube. The surroundings are also at 300 K. Assume that both inside convective heat transfer coefficients are large.

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