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An enclosure contains helium at a pressure of 1.3 atm and has two vertical heating surfaces which are maintained at 80 and 20degree C respectively

An enclosure contains helium at a pressure of 1.3 atm and has two vertical heating surfaces which are maintained at 80 and 20degree C respectively the vertical surfaces are 40 by 40 cm and are separated by gap of 2.0cm. Calculate the free convection heat transfer between the vertical surfaces

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