A state of the art is reported about the behavior of gas bubbles originating and rising in a pool of liquid, including the researches carried out at LOTHAR, with several cooperations. The study has interest not only per se, but it is mainly intended to open the way to the comprehension of more complex boiling phenomena, in which bubble dynamics plays a determinant role. Experimental and theoretical works on this topic are also useful for the optimization of a wide class of industrial processes (including food processing ones) which involve mass and thermal exchange in bubbly flows. The entire “life” of a bubble is considered, starting from its “birth” with injection of gas in the fluid from an orifice (a simpler condition than nucleation in boiling) through its rising in the fluid up to the “death” at the liquid upper interface, which may generate foams or secondary droplets. The current state of the art of modeling in each of the three aspects is reported. The review is mainly concerned with isolated bubbles, although some aspects of bubble-bubble interaction are also occasionally outlined.
Birth, life and death of gas bubbles rising in a stagnant liquid
DI MARCO, PAOLO
2005-01-01
Abstract
A state of the art is reported about the behavior of gas bubbles originating and rising in a pool of liquid, including the researches carried out at LOTHAR, with several cooperations. The study has interest not only per se, but it is mainly intended to open the way to the comprehension of more complex boiling phenomena, in which bubble dynamics plays a determinant role. Experimental and theoretical works on this topic are also useful for the optimization of a wide class of industrial processes (including food processing ones) which involve mass and thermal exchange in bubbly flows. The entire “life” of a bubble is considered, starting from its “birth” with injection of gas in the fluid from an orifice (a simpler condition than nucleation in boiling) through its rising in the fluid up to the “death” at the liquid upper interface, which may generate foams or secondary droplets. The current state of the art of modeling in each of the three aspects is reported. The review is mainly concerned with isolated bubbles, although some aspects of bubble-bubble interaction are also occasionally outlined.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
