Unit Operations
p A The dimensions of the variables in terms of length L mass M time θ temperature T and heat H are given as follows Q/A rate of heat transfer per unit area H L 2 θ 1 u velocity of the flowing fluid L θ 1 l linear dimension of the surface L µ viscosity of the flowing fluid M L 1 θ 1 ρ density of the flowing fluid M L 3 k thermal conductivity of the flowing fluid