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Heat transfer by molecular collision in ____________________(a) Conduction(b) Convection(c) Scattering(d) RadiationThis question was addressed to me by my school principal while I was bunking the class.The question is from Convective Mass Transfer topic in division Mass Transfer of Bioprocess Engineering

Answer»

Right choice is (b) Convection

To explain I would say: Flow of heat through currents within a fluid (liquid or gas). Convection is the displacement of volumes of a substance in a liquid or gaseous PHASE. When a mass of a fluid is heated up, for example when it is in contact with a warmer surface, its molecules are carried away and scattered CAUSING that the mass of that fluid becomes less dense. For this REASON, the warmed mass will be displaced vertically and/or horizontally, while the colder and denser mass of fluid goes down (the low-kinetic-energy molecules displace the molecules in high-kinetic-energy states). Through this PROCESS, the molecules of the hot fluid TRANSFER heat continuously toward the volumes of the colder fluid.



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