Fluid Statics Flashcards
Equation for hydrostatic pressure below surface
Hydrostatic pressure = Patm + density * gravity * height
Resultant force on submerged object
Resultant force = Pressure at point * Area
Buoyancy equation
Buoyancy force = fluid density * gravity * volume of submerged object
How would you determine if a flow is laminar?
If it has a Reynolds number of below 2300
How would you determine if a flow is transitional?
If it has a Reynolds number between 2300 and 4000
How would you determine if a flow is turbulent?
If it has a Reynolds number above 4000
What is the equation for Reynolds number?
(Densityvelocitycharacteristic dimension) / dynamic viscosity
How do you calculate characteristic dimension, D
D = 4 * cross sectional area/ wetted perimeter
How do you calculate friction factor for laminar flow?
f = 64/Re
How do you calculate friction factor for turbulent flow with a smooth pipe?
f = 0.3164/Re^0.25
How do you calculate frictional factor for turbulent flow with rough pipe?
Hydraulic roughness, e used in haaland approximation
What is the equation for frictional minor loss?
Minor frictional loss = Kl * 0.5 * density * average velocity ^2
What is the total head loss for pipe connected in series?
Head loss = sum of major frictional loss + sum of minor frictional loss
What is the equation for frictional major loss?
Frictional major loss = frictional factor * (length/diameter) * 0.5 * density * average velocity^2
How do you calculate entrance length (Lh) for a laminar pipe?
Laminar Lh / D = 0.05 Re