CONDITIONS OF THE PHASE TRANSITION DURING THE FLOW OF A GAS-LIGUID MIXTURE IN CONTROLLED CHOKES

Abstract

The article deals with the issues of phase transition in gas-liquid mixtures of controlled chokes. The relevance of the research topic and its scientific novelty are given. The criteria for the occurrence of cavitation and hydrate formation in liquid and gaseous fluids are presented. The equations that allow to determine the condition of the phase transition from the liquid state to the gas – liquid state the appearance of cavitation in the cross-section of the flow channel of the controlled choke are described. The article describes a modern method of protecting the design of the controlled throttle from the phenomenon of cavitation. Protection is performed by installing and using throttle cells or throttling stages. The result of the use of throttle cells is given. An example of the formation of hydrates in a gas-liquid mixture during its flow through a controlled choke is considered. The criterion and method for determining the conditions of hydrate formation in the flow channel of the controlled choke is given, which consists in constructing the operating curve of the controlled choke and its intersection with the curve of hydrate formation of the gas-liquid mixture to determine the conditions and areas of hydrate formation. The scientific novelty of the work includes the criteria for the conditions of the phase transition, as well as the provision of practical recommendations to specialists involved in the design and operation of the controlled chokes. According to its content, the article is of interest to specialists involved in the development and operation of pneumatic/hydraulic systems, and in particular, the controlled chokes.