The thermal contact conductance at the interface of two 1-cm-thick aluminum plates is measured to be 11,000 W/m².K. Determine the thickness of the alu- minum plate whose thermal resistance is equal to the thermal resistance of the interface between the plates (Fig. 3–17).
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- A sphere of radius 4.3 mm is at 3499 K. Calculate the rate of radiation of energy (in W) by the sphere, if its emissivity is 1.40000cm, and at 1000C its length is 40060cm. (a) What is the linear expansion coefficient of the alloy? (b) what is the temperature when its length is 39975cm? (10) A hole with diameter of 2cm is drilled through a stainless steel pate at room temperature (20OC). By what fraction (Dr/r) will the hole be larger when the plate is heated to 1500C? (11) Calculate the fractional change in volume (Dv/v) of an aluminum bar that undergoes a change in temperature of 300C.When lead is melted at atmospheric pressure, the melting point is 327 ° C, the density decreases from 1.101 × 104 to 1.065 × 104 kg m-3 and the latent heat is 24.5 kJ/kg. Estimate the increase in melting point of lead, T (in K), at 76 atm.
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