Mass Flux Density Converter

What Is Mass Flux Density

Mass flux density measures mass flow rate per unit area. You express this property in kilograms per square meter per second (kg/(m²·s)) in SI units. Engineers use mass flux to characterize filtration rates and membrane performance.

Mass flux combines flow rate and area effects into one parameter. You compare different sized systems using mass flux. Membrane manufacturers specify maximum allowable flux to prevent fouling.

Mass Flux Density Formula

Calculate mass flux density from mass flow rate and area:

Where G equals mass flux density, ṁ equals mass flow rate, and A equals cross-sectional area.

Relate to velocity and density:

Example: Water (ρ = 1000 kg/m³) flows at 2 m/s:

Typical Mass Flux Values

Applications

Membrane processes specify flux limits to control fouling. Reverse osmosis systems operate at 0.0005 to 0.002 kg/(m²·s). You increase flux by raising pressure but risk membrane damage.

Cooling towers use mass flux for water distribution design. Uniform flux ensures efficient heat transfer. You calculate required area from total flow and target flux.

Boiling and condensation heat transfer use mass flux for two-phase flow analysis. Critical heat flux depends on mass flux. You optimize flux for maximum heat transfer without dryout.

Unit Conversion Factors

Frequently Asked Questions