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Heat Lecture-4

·         Convection heat transfer involves both energy transfer due to random molecular motions and by bulk motion of the fluid

·         Convection heat transfer includes both forced convection and natural convection

·         In convection heat transfer, the transfer of heat is between a surface and a moving fluid (liquid or gas), when they are at different temperatures. The rate of transfer is given by Newton’s Law of Cooling.

Radiation

·       All surfaces of finite temperature emit energy in the form of electromagnetic waves

·       In the absence of an intervening medium, there is a heat transfer by radiation between two surfaces at different temperatures

·       The maximum flux, E (W / m²), at which radiation may be emitted from a blackbody surface is given by:

Stefan Boltzmann Law