As a researcher in the field of heat transfer, how will you distinguish between radiation by black body and a real body? Explain briefly
As a researcher in the field of heat transfer, how will you distinguish between radiation by black body and a real body? Explain briefly
Point out and briefly explain the various factors affect the thermal conductivity of a material.
What is the analogical reason between heat transfer by conduction and flow of electricity through ohmic resistance? Use a composite wall of a building to illustrate the concept.
A composite slab with three layers of thermal conductivities k1, k2, k3 and thickness t1, t2, t3 respectively, are placed in a close contact. Derive an expression from the first principle for the heat flow through the composite slab per unit surface area in terms of the overall temperature difference across the slab.
Based upon the reradiating properties of absorptivity, reflectivity and transmissivity, how would you distinguish between the following:
Black body, white body, transparent body and opaque body.
The nature of surfaces affects the absorption and the reflection of radiation. Assume that you are given wood for construction and asked to take two pieces of the wood to be placed in sunlight. One piece is to be painted white and the other black. Which piece will absorb more heat?
If the same two pieces at room temperature are laid on the ground in the middle of the night during the harmattan in Bolgatanga in the Upper East region, which piece will cool faster? Give argument in support of your answer.
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