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Table 1 The calculation of the apparent viscosity η S and the shear rate γ ˙ [17],[18]

From: Floating layer formation, foaming, and microbial community structure change in full-scale biogas plant due to disruption of mixing and substrate overloading

Measuring system Equation Constant
Double gab measuring system τ = 1 + δ 2 ( δ 2 · R 3 2 + R 2 2 ) · M 4000 · πL C L C L = 1.10
δ = 1.0245
RMKi = 20.25 mm
γ ˙ = ω · 1 + δ 2 δ 2 - 1
RMKa = 21.00 mm
L = 78.7 mm
Cylinder measuring system τ = 1 + δ 2 2000 · δ 2 · M 2 π L · R i 2 · C L C L = 1.10
δ = 1.0848
γ ˙ = ω · 1 + δ 2 δ 2 - 1 RMKi = 13.33
L = 40.003 mm
Ball measuring cell τ = C ss ·M C SS = 15.0 Pa mNm
C SR = 0.427 min s
γ ˙ = C SR · n
d K = 12.0 mm
Paddle mixer [17] Ne = P p · n 3 · d 5 = C lam Re C turb CMO = 10.94
Clam = 189.6
Cturb = 9.4
γ ˙ = C MO · n
d R = 30 mm
d B = 143 mm
Pipe viscosimeter [18] τ w = d · p 4 · L Lpipe = 2,500 mm
dpipe = 43.2
dw dr w = 3 n ' + 1 4 n ' · 8 · w m d
n ' = dln d · p 4 · L dln 8 · w m d