INVESTIGATION OF THE PROCESS OF CONVECTIVE HEAT EXCHANGE IN THE LAYER OF SOLID DISPERSE MATERIAL FROM MOUNTAIN ROCKS OF MAGMATIC ORIGIN

Abstract

The cause of catastrophic fires in high-rise buildings is the synthetic thermal insulation or the insulation containing synthetic components. The deterrent to the widespread use of safe, fire-resistant, thermal insulation based on basalt fibers is its high cost, due to the high specific energy consumption for its production. One of the factors that increase the energy efficiency of production is the utilization of the secondary power resource of high-temperature combustion products. As the nozzle of the high-temperature regenerative heat exchanger, is considered the disperse system of the basalt rubble. The aim of the work is to study the non-stationary process of convective heat exchange of air in a layer of solid dispersed material from rocks of magmatic origin. The characteristics of basalt rubble are given, its structural and linear properties are determined. An analytical assessment of the intensity of convective heat transfer in the nozzle are carried out. The description and characteristics of the experimental stand is given. The results of experimental studies of non-stationary convective heat transfer in a dispersed system based on basalt rubble are presented. It has been established that the experimentally obtained heat transfer coefficients for nozzle of dispersed materials with a layer thickness of 1.5–3.0 characteristic linear sizes of a dispersed particle turned out to be 4 times less than the values obtained for dense, extended layers of the dispersed system. Assumptions are made regarding the differences obtained.