Heat And Mass Transfer By Convection

3 Contents Chapter Page Chapter 1: Fundamentals of convection 4 Chapter 2: External forced convection 36 Chapter 3: Internal forced convection 56 Chapter 4: Heat transfer by natural convection 68 Chapter 5: Boiling and condensation heat transfer 85 Heat transfer Tables and Figures 115 References 129 Heat Transfer4 Chapter 1 Fundamenta ls of convection5 Components of a simple electrical power plant.6 Heat transfer processes No Mode and Mechanism System and schematic presentation Rate equation 1 - Conduction: Diffusion of energy due to random Molecular motion. Heat conduction through a large plane wall of thickness x and area A. ..cond sdTQ KAdx= , [W] .conddTqKdx= [W/m2] 1212. () ;.cond totaltotalTTKA Lq TT RL R KA= = = [W/m2] 2 J=Convection: =Diffusion of energy =due to random =Molecular motion plus energy transfer due to=bulk motion. = ==Heat transfer from a hot surface to the surrounding fluid by convection and conduction=..( )conv s sQ hA T T= [W] ..( )conv sq hT T= [W/m2] .1.( ) ;.sconv s c onvConvTTq hT T RR hA= = = Qforced conv.>Qfree conv.>Qcond . 3 - Radiation: Energy transfer by electromagnetic waves. The absorption, reflection, and transmission of incident radiation are by a semitransparent material. Heat transfer