V. G. Zhilin

An experimental investigation of the characteristics of explosive boiling of subcooled water on a hot surface under conditions of change of boiling modes

A procedure of estimating the area of contact between cold water and a hot hemispherical surface is developed and described. Synchronous measurements of pressure pulses in liquid, the temperature of a body, and characteristics of contact between a heated body and a coolant are performed under conditions of abrupt change of boiling modes (from film to nucleate boiling). Characteristic features of the investigated processes are determined, which are largely defined by the temperature of the hemisphere, by its thermophysical properties, and by the presence of surface oxide films. It is found that the maximal value of the amplitude of pressure pulses, which may be as high as ∼1 MPa in the experiments, is observed in the region of temperatures of the hot body which are close to the temperature of limiting superheat of water. The dependences are obtained of the rate of spreading of liquid and of the time of delay of its explosive boiling from the instant of boiling on the temperature of the hemisphere.

Diagnostics of Liquid Metal Flows Using Fibre-Optic Velocity Sensor

The present work is connected with a theoretical and experimental study of the application of two-component fibre-optic velocity sensors for diagnostics of liquid metal turbulent flow. The above sensors have high spatial resolution (10−3mm3) and exhibit insignificant sensitivity to admixtures and the magnetic field; they could also be used for liquid metals in the presence of strong currents (≈10 A). The experimental data on the velocity fields and intensity of its pulsations in strongly nonuniform liquid metal magnetohydrodynamic flows are given. Dynamical errors of velocity measurements at a frequency of 200 Hz are negligible.

An experimental investigation into the heat transfer developed along a uniformly heated tube carrying a flow of liquid metal and placed in transverse magnetic field

We present results from an experimental investigation into heat transfer for liquid-metal coolant flowing through a horizontal heated tube (at qw = constant on its wall) placed in transverse magnetic field. Three-dimensional fields of averaged temperature are measured, and heat-transfer coefficients along the tube length are calculated in a wide range of Reynolds numbers and Hartman numbers for different values of heat flux density.