In nature and technology there are numerous processes involving phase transitions of the first kind – the how to write a summary of an article liquid-vapor. Contemporary technology, in particular transport and power sector, based on the conversion of potential energy of the fuel into kinetic energy, where the basic method is definitely the functioning fluid passage from the liquid for the gaseous state. The improve in heat capacity and thermal processes intensification devices leads to the fact that the phase transition liquid-vapor precedes metastable (overheated) liquid state. Boil the superheated liquid is accompanied by a considerable release of power stored in it. This truth must be taken into account in the analysis of accidents connected to the depressurization of vessels and apparatuses filled with liquid at higher pressures and temperatures. Hence actively studied problems under the title “steam explosion”. Process analysis intensive phase transition from the superheated liquid to gaseous state requires detailed information about situations in the vapor phase nucleation in the superheated liquid and its further development.

The experimental process. Maximum temperature restricted superheating liquids homogeneous nucleation, i.e., The spontaneous formation of nuclei of steam, the dimensions of which exceed critical. Pa such embryos liquid capable of exceptionally speedy boil. The frequency of your spontaneous formation of nuclei is determined by the formula. Frequency versus temperature is expressed really strongly. Inside the case of superheated ethyl ester, one example is, at a temperature of 143 ° C ravna1 nucleation frequency. Above this temperature only 2 degrees likelihood of germ increases 105 instances, and 1010 occasions 3 degrees. This shows that, on the 1 hand, highly fluid stable with respect for the appearance of spontaneous nucleation, and on the other hand, within a narrow temperature variety which is usually characterized by a particular temperature, known as temperature homogeneous nucleation, having a probability of practically equal to one particular, it boils .

The sensible realization of effervescence on spontaneous nucleation web-sites could possibly be achieved by speedy heating unsteady. For stationary heating, the implementation of such a problem linked to many issues due to the presence in a liquid artificial nucleation websites disposed on the surfaces of dispersed particles contaminating fluid.