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Notation used in calculating the Reynolds criterionm - dynamic viscosity coefficient: - in engineering units - x106, kg·s/m2 - e.g. for air m = 1,81·10-6 kg·s/m2, - in SI units - x105, Pa·s [kg/(s·m)] - e.g. for air m = 1,81·10-5 Pa·s; d - channel diameter (hydraulic diameter), mm; G - mass flow rate of the working substance, g/s. Reynolds number (Re) formula- for m in technical units - Re = 4·G/[3,14·d·m·g], - for m in SI - Re = 4·G/[3,14·d·m], where g - free fall acceleration, m/s2. When you select m (on the upper nomogram) we are looking for the numerical part of the dynamic viscosity coefficient, regardless of the system of units (technical or SI) - nothing needs to be recalculated. For air it is 1.8. |
d = 0,4 ... 7,5 mm G = 0,2 ... 1 mg/s Re= 20 ... 80 |
d = 1,8 ... 12,5 mm G = 40 ... 200 mg/s Re= 600 ... 3000 |
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d = 0,4 ... 9,5 mm G = 0 ... 200 mg/s Re= 1000 ... 3000 |
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d = 1,8 ... 12,5 mm G = 40 ... 200 mg/s Re= 1000 ... 3000 |
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d = 0,6 ... 12,5 mm G = 10 ... 90 mg/s Re= 200 ... 800 |
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Nomogram #6 d = 2,5 ... 12,5 mm G = 200 ... 1000 mg/s Re= 800 ... 2400 |
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d = 2,5 ... 12,5 mm G = 200 ... 1000 mg/s Re= 2500 ... 8500 |
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