Heat Transfer
A composite wall consists of two plates A and B placed in series normal to the flow of heat. The thermal conductivities are kA and kB and the specific heat capacities are CPA and CPB for plates A and B respectively. Plate B has twice the thickness of plate A. At steady state, the temperature difference across plate A is greater than that across plate B, when

CPA > CPB
CPA < CPB
KA < 0.5kB
KA>2 kB

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Heat Transfer
In sub-cooled boiling,

Temperature of the heating surface is more than the boiling point of the liquid
Bubbles from heating surface are absorbed by the mass of the liquid
Very large vapour space is necessary
Temperature of the heating surface is less than the boiling point of the liquid

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