The net flow is always in the direction of the temperature decrease. 5 2. Mechanism of heat transfer ?(a) Conduction ?(b) Convection ? (natural convection & forced convection) ?(c) Radiation 6 3. Application of heat transfer ?(a) Chemical reactions ?(b) Unit operations ?(c) Heat preservation Enhance heat transfer Prevent heat transfer 7 Content of this section Chapter 10 conduction in solids Chapter 11 to 13 heat transfer to fluids by conduction and convection Chapter 14 heat transfer by radiation Chapter 15 design of equipment 8 Chapter 10 Heat Transfer by Conduction 9 Content ? 10.1 Basic Law of Conduction ? 10.2 Steady-State Conduction ?☆ 10.3 Unsteady-state Conduction 10 10.1 Basic Law of Conduction ? 1. Fourier ’ s law ? 2. Thermal conductivity ( 热导率/ 导热系数) k
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