What is bulk modulus?
In fluid mechanics, bulk modulus is a term used to define the compressibility of a fluid. Uniform external pressure is applied to the fluid to determine its bulk modulus.SignificanceApplied pressure should directly affect a hydraulic system, not merely compress the hydraulic fluid. Bulk modulus determines the exact amount of hydraulic fluid required to ensure peak performance.EffectsIncorrect bulk modulus calculations can compromise a hydraulic system’s response time, requiring extra energy to first compress the fluid, then force it through the actuator.ConsiderationsTemperature is a key consideration in determining bulk modulus because fluids expand when temperatures rise. Air can also have dramatic effects on bulk modulus due to air compressing easier than oil.TypesIsothermal bulk modulus is determined by compressing the fluid slowly, allowing any generated heat to dissipate.
