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2 Journal of Ecological Engineering

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Calculation and Selection of Flat-Plate Solar Collector Geometric Parameters with Thermosiphon Circulation

Amirgaliyev Y., Kunelbayev M., Wójcik W., Amirgaliyev B., Kalizhanova A., Auelbekov O., Kataev N., Kozbakova A.

Journal of Ecological Engineering

2018

Vol. 19, nr 6

176--181

The article describes a newly developed calculation technique and the choice of the geometrical parameters of the solar collector with the siphon effect. The dependence of the cross section of the pipe on the flow time for different values of the head is also shown. With an increase in the siphon head, the flow time of the liquid increases as well. This is explained by the fact that with increasing head, the hydraulic resistance of the siphon rises, which leads to a decrease in the velocity of the fluid. For the first time, a relationship determining the time of fluid outflow in dependence on the geometric parameters of the solar collector is formulated. The developed technique allowed to establish that the local hydraulic resistance and friction play a significant role in the heat carrier flow rate.

3D Modelling of Distribution of Temperature Field in The Rolling Mill

Amirgaliyev Y., Wójcik W., Ospanova T., Jetpisov K.

Journal of Ecological Engineering

2017

Vol. 18, nr 6

1--7

This article is dedicated to the study of numerical simulation of temperature field distribution in rolling mill with many cages for continuous casting and rolling stripe of metal wire. In work the simplest is used in use, certainly a steady, economic difference method, a method of division of variables of a multidimensional task into a chain of one-dimensional tasks, a method of total approximation, the locally one-dimensional scheme. The algorithm of numerical modeling of distribution of a temperature field on cages of the rolling mill is constructed. Solutions of the three dimensional temperature field distribution tasks based on experimental data allows finding the temperature across the strip of metal rod in a rolling mill stands. Calculation of the distribution of temperature field in hearth of deformation of a metal rod was realized on implicit scheme. The calculations are shown in the graphs. It provides an analysis of the error of errors.