Gap in drop collision rate between diffusive and inertial regimes explains the stability of fogs and non-precipitating clouds

HIGHLIGHTS

• What: The model introduced here is both tractable mathematically and exhaustive from the mechanistic point of view to gain an understanding of each microphysical effect on its own. As the authors aim here to take into account Brownian diffusion in the same model as gravity, the authors extend the concept of collisional efficiency in § 5 by adapting the reference collision frequency. This inertial contribution presents similarities with the efficiency obtained in the limit ¯ → 0, which vanishes below a threshold. The authors show that thermal diffusion dominates the collision rate below a transitional Péclet number of order . . .
  

   

  

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