Summaries
The deformation and breakup of a droplet in two-phase shear flow were simulated by the finite difference lattice Boltzmann method (FDLBM). The fine droplets formation process was investigated in a beadless disperser using ultrathin film and high shear (ultrathin film high-shear disperser, UFHD). As a result, the critical capillary number,C ac,was found at a constant Reynolds number,R e.The necessary condition for the creation of fine droplets in the disperser was that the capillary numberC a>C ac.The atomisation ability of the disperser was discussed based onC ac.The simulation results demonstrated that the disperser can be used to prepare nanometre-size droplets.
Résumé
On a simulé la déformation et la désintégration d’une gouttelette dans un écoulement de cisaillement à deux phases, grâce à la méthode de Boltzmann de treillis de différence finie (FDLBM). Le procédé de formation de gouttelettes fines a été investigué dans un disperseur beadless, en utilisant un film ultra mince et un [taux de] cisaillernent élevé (disperseur à film ultra mince et à taux de cisaillement élevé, UFHD). Comme résultat, le nombre capillaire critique,C ac,a été trouvé à un nombre de Reynolds constant,R e.La formation de gouttelettes fines dans le disperseur dépendait du fait que le nombre capillaireC a>C ac.Une discussion de la capacité d’atomisation du disperseur était basée surC ac.Les résultats de la simulation ont montré que le disperseur peut être utilisé pour la préparation de gouttelettes de taille nanométrique.
Zusammenfassung
Die Verformung und Zerstörung eines Tropfens in Zwei-Phasen Scherfluss wurde mittels der Endlich-Differenz Lattice-Boltzmann Methode (finite difference lattice Boltzmann method, FDLBM) untersucht. Wir verwendeten einen kugellosen Disersator mit ultra-dünnem Film und großen Scherkräften (ultrathin film high-shear disperser, UFHD) um den Prozess der Tropfenbildung zu studieren und fanden, daß die kritische Kapillarnummer,C ac,einer konstanten ReynoldsnummerR e,entsprach. Für die Bildung feiner Tropfen im Dispersator war es nötig, daßC a>C ac.Wir diskutieren die Atomisierungsleistung des Dispersators auf der Basis vonC ac.Die Ergebnisse unserer Simulation demonstrieren, daß der Dispersator zur Herstellung von Tropfen im Nanometerbereich verwendet werden kann.
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Zhang, X.F., Enomura, M., Tsutahara, M. et al. Numerical simulation of fine droplets formation process in beadless disperser. Surface Coatings International Part B: Coatings Transactions 89, 269–274 (2006). https://doi.org/10.1007/BF02765578
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DOI: https://doi.org/10.1007/BF02765578