I am doing solar still simulation by coupling of species and energy equation. I want to write source term for evaporation and condensation. For this mass of evaporation or condensation is required. but I am facing problem to write the field function of the expression

m_c = [(-rho*Dm/Lg)* integral(dY/dy) dx ] with lower limit 0 and upper limt Lg(length of glass). Where rho = density, Dm = molecular diffusivity, Y = mass fraction of water vapor and y = vertical position.

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