Friction Loss ની ગણતરી કેવી રીતે કરવી
Friction Loss શું છે?
Friction loss (pressure drop) in pipes and ducts represents energy loss. It's critical for pump and fan sizing.
સૂત્ર
Hazen-Williams: hf = (10.67×L×Q^1.85) / (C^1.85×D^4.87)
- L
- L value — Variable used in the calculation
- Q
- Q value — Variable used in the calculation
- C
- C value — Variable used in the calculation
- D
- D value — Variable used in the calculation
પગલું દ્વારા પગલું માર્ગદર્શિકા
- 1Hazen-Williams: hf = (10.67×L×Q^1.85) / (C^1.85×D^4.87)
- 2Darcy-Weisbach: hf = f×(L/D)×(V²/2g)
- 3Results show required head or fan power
Worked Examples
ઇનપુટ
PVC pipe (C=150), Q=0.05 m³/s, D=50 mm, L=100 m
પરિણામ
hf ≈ 10-12 m head loss
Significant energy requirement
Common Mistakes to Avoid
- ✕Neglecting minor losses (fittings, valves)
- ✕Using wrong friction coefficients for pipe age
Frequently Asked Questions
How does diameter affect friction loss?
Loss inversely proportional to D^5 (or D^4.87); doubling diameter reduces loss 32×.
What is dynamic viscosity's role?
At low Reynolds numbers (laminar), viscosity dominates friction. At high (turbulent), roughness dominates.
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