veloccity boundary layer presentation vbl.pptx

vbl

1. What is Nusselt Number? The Nusselt number, a dimensionless parameter crucial in convective heat transfer analysis, expresses the relationship between convective heat transfer and conductive heat transfer within a fluid Nussel number is denoted by the symbol N Nu and it is given by, Nusselt Number for Forced Convection N nu =f( N Re , N Pr ) Nusselt Number for Natural Convection N nu =f( N Gr , N Pr )

2. It is defined as the ratio of the buoyancy forces to the viscous forces acting in the fluid layer. It is used in free convection Its role is same as that of Reynold number in forced convection . The Grashof number characterises the type of boundary layer developed in natural convection heat transfer. It is denoted by Gr and expressed as