Reservoir-type microcapsules were produced in a mild and highly efficient manner using a coaxial ultrasonic atomizer. To understand the microencapsulation mechanism, the atomizer was operated in different modes. The results suggested the reservoir-type microcapsules were formed by midair collision of the microdrops of the two component liquids consisting of a polymer solution and an aqueous sol...

Uscarea prin pulverizare este o metodă frecvent folosită la încapsularea microorganismelor probiotice. În prezentul studiu a fost utilizat duză ultrasonică de 120 kHz pentru a obţine granule foarte fine, care pot fi folosite în produse lactate probiotice. Celule de bacterii lactice au fost încapsulate în alginat şi maltodextrină prin atomizare cu ultrasunete. Încapsularea a fost realizată pentr...

The atomization effect is an important factor of the heat transfer of liquid nitrogen spray. In this paper, two kinds of internal-mixing twin-fluid atomizers were design. According to the fracture theory and fluid mechanics, the model is established to simulate atomization effect. The results showed that: Internal-mixing atomizers, with the liquid nitrogen atomization size from 20um to 40um, ha...

In this paper, the effect of atomizer geometry on the flow in simplex atomizers and atomizer performance is numerically investigated. A computational model based on the Arbitrary-Lagrangian-Eulerian method has been used. The effect of changes in four non-dimensional geometric parameters on the atomizer performance is studied. These geometric parameters are the atomizer constant (ratio of inlet ...

Ultrasonic atomization, a process of generating fine droplets through irradiation of high-frequency ultrasound to a gas–liquid interface from the liquid underneath, is applied to separating ethanol from its aqueous solution. Towards its practical use, the process of collecting in two cooling stages the ethanolenriched mist—generated via an ultrasonic atomizer (ultrasonic transducer operated at ...

Temperature regulating system by gaseous nitrogen is of importance to the space environment simulator, which keeps the shrouds in the temperature range from -150°C to +150°C. Liquid nitrogen spray equipment is one of the most critical parts in the temperature regulating system by gaseous nitrogen. Y type jet atomizer and internal mixing atomizer of the liquid nitrogen spray equipment are studie...

A computational analysis of flow in simplex fuel atomizers using the arbitrary-Lagrangian–Eulerian method is presented. It is well established that the geometry of an atomizer plays an important role in governing its performance. We have investigated the effect on atomizer performance of four geometric parameters, namely, inlet slot angle, spin chamber convergence angle, trumpet angle, and trum...