As shown in schematic below, an alloy is cast as a rectangular slab between two thick mould walls that differ in their thermal conductivities. Shrinkage defects are found at a distance L1 from Mould-1 with thermal conductivity 𝑘1 and distance L2 from Mould-2 with thermal conductivity 𝑘2. If the ratio L1:L2 = 3:2, and assuming 1-D heat transfer, the ratio (k1 ⁄𝑘2) is ________ (to two decimal places).
Correct answer is 2.25 As we know, Gaskell's equation = x∝√k, where x=solidified part of metal and k= thermal conductivity of metal. As per question, L1∝√ K 1 and L2∝√ K2 k1/k1= (L1/L2)2 = (1.5)2 = 2.25
Correct answer is 2.25
As we know, Gaskell’s equation = x∝√k, where x=solidified part of metal and k= thermal conductivity of metal.
As per question, L1∝√ K 1 and L2∝√ K2
k1/k1= (L1/L2)2 = (1.5)2 = 2.25
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