Читать книгу The Rheology Handbook - Thomas Mezger - Страница 104

Using the yield point value, it is possible to make a simple, rough estimation of the wet layer thickness on a vertical wall (see Figure 3.23).

The following holds: τ = F/A, with the area to be coated: A = b ⋅ c,

and the weight force of the layer due to gravity: F = FG = m ⋅ g = V ⋅ ρ ⋅ g

with the mass m [kg] and the volume

V [m3] = a ⋅ b ⋅ c of the volume element,

the gravitation constant g = 9.81 m/s2, and the density ρ [kg/m3] of the coating,

it follows that: FG = a ⋅ b ⋅ c ⋅ ρ ⋅ g

Result: τ = τ0 = FG/A = (a ⋅ b ⋅ c ⋅ ρ ⋅ g)/(b ⋅ c) = a ⋅ ρ ⋅ g