Locked air volume as a confidence factor in determining the volumetric strength of a liquid

Diagnostics of the condition of working fluids and oils in the field of direct operation always remains anurgent task of the quality control departments of enterprises and industries that use them for the needs of their own machine park or for filling the manufactured products. Inappropriate storage conditions in ware houses and terminals, unscrupulous manufacturers and suppliers, fake quality certificates and other factors of the modern developed market economy lead to a situation where equipment is filled with working liquids and oils with unknown, distorted characteristics. One important characteristic is the foaming resistance of the liquid. It is of particular importantce for compress requipment, power and machine-tool hydraulic drive. The modes of a brupt pressure drop, rarefaction, flow separation from the channel profile and other influences can cause a rupture in the continuity of the liquid with the formation of gas bubbles and opens. In this case, there lubrication interval is violated, overheating and premature wear of equipment occur, cavitation develops. Despite the fact that the study of fluid rupture has been going on for more than a decade, a reliable and reproducible method of diagnosing it has not been found. Quite well known among the methods is the rupture of liquid in a sealed chamber with a gradually increasing volume - a bellows. The article on the basis of there search conducted by the author analyzes them in reliability factor of this method - the presence of air accidentally locked in the chamber.