In a heat-treatment process, polished plain-carbon steel cylinders 0.5 m long, 0

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In a heat-treatment process, polished plain-carbon steel cylinders 0.5 m long, 0.05 m in diameter and initially at 500degreeC are suspended vertically in still air (T = -21degreeC) foe cooling. Estimate the time required for the cylinder centerline temperature to drop to 250degreeC. How much would the cooling time change if the cylinder were suspended in a horizontal position? Explain determination of the relevant properties of air. You may ignore ends of the cylinder in your estimates of heat transfer coefficient h; you may assume that convection conditions are constant during the entire process and are the same as at the beginning of the process.

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