EngiRef / Collection
Formula Library
Reference equations and calculators
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Formula Library · Page 2
Reference equations and calculators
Specific Heat Ratio
Ratio of specific heats at constant pressure to volume
Adiabatic Process
Pressure-volume relation for adiabatic process
Otto Cycle Efficiency
Thermal efficiency of ideal Otto cycle
Diesel Cycle Efficiency
Thermal efficiency of ideal Diesel cycle
Refrigeration COP
Coefficient of performance for refrigeration
Heat Pump COP
Coefficient of performance for heat pump
Log Mean Temperature Difference
Effective temperature difference for heat exchangers
Overall Heat Transfer Coefficient
Combined convection-conduction-convection resistance
Thermal Resistance (Conduction)
Thermal resistance of a plane wall
Bernoulli Equation
Conservation of energy along a streamline
Torricelli's Theorem
Velocity of fluid flowing from an orifice
Minor Head Loss
Head loss through fittings and valves
Drag Force
Aerodynamic or hydrodynamic drag force
Lift Force
Aerodynamic or hydrodynamic lift force
Froude Number
Ratio of inertial to gravitational forces
Mach Number
Ratio of flow velocity to speed of sound
Hagen-Poiseuille Equation
Volumetric flow rate for laminar pipe flow
Tresca Criterion (Max Shear Stress)
Maximum shear stress failure criterion
Stress Concentration
Maximum stress at geometric discontinuity
Goodman Diagram (Fatigue)
Modified Goodman line for fatigue design
Miner's Rule (Cumulative Damage)
Linear damage accumulation rule
Fracture Toughness (Griffith)
Mode I stress intensity factor
True Strain
True strain from engineering strain