Question 8 Tries remaining: 3 Marked out of 100 | F Flag question in a die casti

Question

Question 8 Tries remaining: 3 Marked out of 100 | F Flag question in a die casting of nickel, heat transfer is limited by the metal-mould interface, which has a heat transfesr coefficient K = 1.8 kJ m-2 K-1 s-1. The following values apply Temperature of the mould, To = 296 K Melting temperature of nickel. T-1726 K Density of solid nickel, Pa = 8900 kg m-3 Latent heat of fusion of nickel. hm-310 kJ kg Using the equation that describes the increase in thickness, S m, as a function of time. ts, for interface -1 resistance limited solidification calculate: () the gradient of a graph of S against t. in mst (ii) the thickness of solidified material after 29 s, in mm Give both your answers to 3 significant figures Gradient of S against t m s-1 Thickness after 29 s G4

Explanation / Answer

1. S= 1.8*1000*(1726-296)/(8900*310*1000)

=9.329*10^(-4) m/s

Change all in standard SI units.

2. 9.329*10^(-4)*29

=0.027 m

=27 mm

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