Flow velocity directly alters the heat transfer boundary layer

Minor frequency modulation changes the circulating flow velocity, leading to sharp variations in liquid film thickness on pipe walls, obvious fluctuations in heat transfer resistance, substantial synchronous swings in heat transfer capacity, and drastic changes in steam output.

Sudden changes easily occur in the critical flow regime range

When flow rate lies at the transition threshold between turbulent and laminar flow, tiny flow variations can trigger flow regime switching, resulting in cliff-like fluctuations in heat transfer efficiency.

Linked deviation of material boiling point and local static pressure

Flow rate variations adjust the static pressure inside pipes, altering actual boiling pressure and synchronously shifting boiling points, which makes evaporation intensity unstable.

Drastic variations in gas-liquid disturbance and entrainment volume

Fluctuating flow stirs the liquid surface and causes varying entrainment of foam and mist. The obstruction degree of gas phase flow changes, destabilizing vacuum and further impacting evaporation capacity.

Uneven concentration distribution amplifies fluctuations

Fluctuating circulation intensity causes concentration stratification inside the tank, widening gaps in local crystallization and heat transfer conditions and hindering stable evaporation performance.