Maurice Tutor

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Category > Engineering Posted 14 May 2018 My Price 5.00

thermal protection barrier

A young engineer is asked to design a thermal protection barrier for a sensitive electronic device that might be exposed to irradiation from a high-powered infrared laser. Having learned as a student that a low thermal conductivity material provides good insulating characteristics, the engineer specifies use of a nanostructured aerogel, characterized by a thermal conductivity of ka = 0.005 W/m∙ K, for the protective barrier. The engineer’s boss questions the wisdom of selecting the aerogel because it has a low thermal conductivity. Consider the sudden laser irradiation of (a) pure aluminum, (b) glass, and (c) aerogel. The laser provides irradiation of G = 10 × 106 W/m2. The absorptivities of the materials are α = 0.2, 0.9, and 0.8 for the aluminum, glass, and aerogel, respectively, and the initial temperature of the barrier is Ti = 300 K. Explain why the boss is concerned.

 

 

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Maurice Tutor
(5)
Status NEW Posted 14 May 2018 02:05 PM My Price 5.00

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