Question: A horizontal 1.25-cm-OD tube is heated to a surface temperature of 250oC and exposed to air at room temperature of 20oC and 1 atm. What

A horizontal 1.25-cm-OD tube is heated to a surface temperature of 250oC and exposed to air at room temperature of 20oC and 1 atm. What is the free-convection heat transfer per unit length of tube?

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