1. A very long horizontal cylinder of Unobtainium, of diameter 100 mm, is initially at a...

 

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1. A very long horizontal cylinder of Unobtainium, of diameter 100 mm, is initially at a uniform temperature of 500K. The cylinder is let to cool in a large room of static air at 300 K Calculate: a) the average convective heat transfer coefficient at the beginning of the cooling process when the initial temperature of the cylinder is 500 K; and (10] b) the temperature along the centre line of the cylinder after 2 minutes. [5] Assume that the properties of Unobtainium do not vary with temperature, and are: k = 15.1 W/mk, c, = 447 J/kgK, p = 1810 kg/m? and a = 23.1 x 10 m2/s. Neglect radiation. 1. A very long horizontal cylinder of Unobtainium, of diameter 100 mm, is initially at a uniform temperature of 500K. The cylinder is let to cool in a large room of static air at 300 K Calculate: a) the average convective heat transfer coefficient at the beginning of the cooling process when the initial temperature of the cylinder is 500 K; and (10] b) the temperature along the centre line of the cylinder after 2 minutes. [5] Assume that the properties of Unobtainium do not vary with temperature, and are: k = 15.1 W/mk, c, = 447 J/kgK, p = 1810 kg/m? and a = 23.1 x 10 m2/s. Neglect radiation.

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