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Transport of momentum is occurred by several types of mechanism.Īnalogies All the fluxes are on the left hand side of three equations. In heat transfer, molecules are relatively stationary and transport is taken by electrons. In the mass transport two components are being transported by relative motion. There is mathematical analogy between these equation but the actual physical mechanism occurring is totally different. Īnalogies Molecular diffusion for heat conduction for constant c p and ρ q/A is heat flux in W/m 2 α is thermal diffusivity in m 2 /s ρ c p T is J/m 3 Īnalogies Molecular diffusion equation for mass transfer j AZ is molar flux of component A due to molecular diffusion in kg mol A/ s.m 2 D AB is the molecular diffusivity of molecules A in B in m 2 /s C A is the concentration of A in kg mol/m 3 z is the distance o f diffusion in meters Īnalogies All three molecular transport equations are identical. Īnalogies Molecular diffusion equation for momentum : ح =momentum transferd/s.m 2 μ / ρ is kinematic viscosity in m 2 /s z is the distance in m v x ρ is momentum/m 3 where the momentum has the units of kg.

Momentum transfer Heat transfer Mass transfer Īnalogies General molecular transport equation: All three of the molecular transport process of momentum, mass and heat are characterized by the same general type of equation. Heat ,mass and momentum transfer Unit process can be classified into three fundamental transfer processes. Ajay Pal Sharma Assistant Professor Department of Chemical Engineering Seth Jai Parkash Mukund Lal Institute of Engineering & Technology, Radaur.

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