Free(Natural) Convection Rayleigh number: For relative magnitude of buoyancy and viscous forces Ra=GrPr For vertical surface transition to turbulence at Rax= 109 Review the basic equations for different potential cases, such as vertical plates, vertical cylinders, horizontal plates (heated and cooled) For horizontal plates, discuss the equations 9.30 9.32.(P513) Please refer to problem 9.34 Heat Transfer Su Yongkang School of Mechanical EngineeringHeat Transfer Su Yongkang School of Mechanical Engineering # 10 Free (Natural) Convection Rayleigh number: For relative magnitude of buoyancy and viscous forces • Review the basic equations for different potential cases, such as vertical plates, vertical cylinders, horizontal plates (heated and cooled) • For horizontal plates, discuss the equations 9.30- 9.32. (P513) • Please refer to problem 9.34. = Pr Rax Grx For vertical surface, transition to turbulence at Rax  109