Liquid Mass Flux in Column Design Formulas

No, the Liquid Mass Flux, measured in Mass Flux cannot be negative.

Liquid Mass Flux is usually measured using the Kilogram per Second per Square Meter[kg/s/m²] for Mass Flux. Kilogram per Hour per Square Meter[kg/s/m²], Kilogram per Hour per Square Foot[kg/s/m²], Pound per Hour per Square Foot[kg/s/m²] are the few other units in which Liquid Mass Flux can be measured.