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Convection–diffusion equation
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<p>The convection–diffusion equation is a <a href="/facts/Parabolic_partial_differential_equation/gJQfRUlr">parabolic partial differential equation</a> that combines the <a href="/facts/Diffusion_equation/l3CUuLqF">diffusion</a> and convection (<a href="/facts/Advection_equation/3rn50V2r">advection</a>) equations. It describes physical phenomena where particles, energy, or other physical quantities are transferred inside a physical system due to two processes: <a href="/facts/Diffusion/KbAxroBa">diffusion</a> and <a href="/facts/Convection/E8vsCPhu">convection</a>. Depending on context, the same equation can be called the <a href="/facts/Advection/3rn50V2r">advection</a>–diffusion equation, <a href="/facts/Drift_velocity/uuxPWGMm">drift</a>–diffusion equation, or (generic) scalar transport equation. </p>