Chemical Engineering / Subcategory
Process Design
Process design calculators and formulas including Reynolds number, Bernoulli's equation, and plant design. Covers pressure drop, pump sizing, and flow regime calculations for chemical plants.
18Formulas
All levels Difficulty
Updated Oct 2026
← All Chemical Engineering (31) Process Design (18)
Fundamental
Compressibility Factor (Real Gas)
Z = PV / (nRT)
Fundamental
Sensible Heat Duty
Q = m * cp * dT
Fundamental
Newton's Law of Viscosity
tau = mu * (dv/dy)
Fundamental
Orifice Meter Flow Rate
Q = Cd * A0 * sqrt(2*dP/(rho*(1-beta^4)))
Fundamental
Net Positive Suction Head Available (NPSHa)
NPSHa = (P_suction - P_vapor)/(rho*g) + z - h_f
Fundamental
Ergun Equation (Packed Bed Pressure Drop)
dP/L = 150*mu*(1-e)^2*v/(e^3*dp^2) + 1.75*rho*(1-e)*v^2/(e^3*dp)
Fundamental
Dilution Equation
C1 * V1 = C2 * V2
Fundamental
Molar Concentration (Molarity)
M = n / V
Fundamental
Degrees of Freedom Analysis
DOF = N_unknowns - N_independent_equations
Fundamental
Prandtl Number
Pr = cp * mu / k
Fundamental
Nusselt Number
Nu = h * L / k
Fundamental
Heat Exchanger Effectiveness (NTU Method)
epsilon = Q_actual / Q_max
Fundamental
Overall Heat Transfer Coefficient
1/U = 1/hi + 1/ho + Rf
Fundamental
Heat Exchanger LMTD
LMTD = (dT1 - dT2) / ln(dT1/dT2)
Fundamental
Darcy-Weisbach Pressure Drop
delta_P = f * (L/D) * (rho * v^2)/2
Fundamental
Continuity Equation (Mass Balance)
rho1 * A1 * v1 = rho2 * A2 * v2
Fundamental
Bernoulli's Equation
P + ½ρv² + ρgh = const
Fundamental
Reynolds Number
Re = ρvD / μ