Investigation of the kinetics of spontaneous boiling-up of superheated n-pentane in a glass tube with defects of the inner surface. I. Monitoring the liquid-vapor surface tension

Abstract

The paper studies the kinetics of spontaneous boiling-up of superheated n-pentane in a thermostated glass tube at a pressure of 0.10 MPa in the temperature range from 70.2 to 125.3°C (superheatings from 34.1 to 89.2°C). Experiments were conducted by the method of lifetime measurement of a superheated liquid both with and without two glass capillaries joined by fluoroplastic. It has been found that under the action of repeated boiling-ups, the boundary of attainable superheating may increase stepwise by 10°C. This effect is reversible. Monitoring the surface tension as the property determining the kinetics of spontaneous boiling-up was realized right in the experimental setup. It is shown that in the temperature range from 61.1 to 170.0 °C, this value does not depend on the number of boiling-ups of a superheated liquid and is in good agreement with reference data.