The name is absent

Chapter 2

... nŋr _f^u'^dH 'lπ^xnR _tU_wm. ₂   0²^/д№)_я__Яюах      ._β.

W = 2R I exp(—)—- ≈ — --exp(-≡-), р =  -------'н-н™*   [2.16]

Ь кТ H¹ H⁷_mmp кТ             2кТ

From Eq. [2.15] and [2.16], the increase in U_max causes a reduction of the
aggregation rate.

2.3.5. Coalescence

Coalescence is the rupture of the thin film of continuous phase that separates
two nearby droplets. Coalescence is usually characterized by the film-drainage
model ^[20]. Coalescence process of droplets can be divided into three steps:
approach, film drainage and rupture.

The stages of film thinning for a simple emulsion system can be described as
follows ^[21]: 1) When two droplets are approaching, film thickness δ decreases
rapidly with time, and dimpling (also corrugations and oscillations) precedes the
formation of a plane parallel film; 2) as interfacial resistance increases the film is
slowly thinned to a critical thickness δ_cr for rupture; 3) rupture occurs when a hole
formed.

Many efforts have been devoted to the understanding of the formation and
thinning of a flat film between drops. Weber number is imported here, which refers
the internal Laplace pressure Pl and external stress T_ext exerted upon the doublet
of drops.

20

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