Heat Treatment Technology of Porous Building Materials with Predictability of Thermophysical Properties

The work is devoted to theoretical and experimental research of thermophysical features of the creation of new porous heat insulating materials, precisely: research of thermodynamic parameters of the heating processes, swelling and drying of materials; substantiation of the choice of the raw mixture method formation and determination of the optimal energy parameters of the swelling process; development of mathematical models of material heat treatment process and methods of basic technological parameters determination; development of advanced technologies for thermal protection of buildings and power equipment. Experimentally determined dependencies of technological parameters of heat treatment of the raw material mixture in the discharge, its composition, which allows obtaining material with minimal thermal conductivity. Also, the resulting dependencies ensure to find the required mode of heat treatment for the given thermophysical properties. The experimental setup has been developed, which provided to determine the basic laws of heat transfer of porous material, on the basis of which data were obtained, which allow to carry out an estimation of heat transfer and exchange characteristics of the new dispersed porous material necessary for technological calculations. A complex mathematical model of the heat energy mode of the building was created, as well as a program for solving the equations of this model, which makes it possible to determine the basic energy characteristics.

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Modeling of the composition of ecologically safe clay-gypsum binders

MATEC Web of Conferences ◽

10.1051/matecconf/201819303045 ◽

2018 ◽

Vol 193 ◽

pp. 03045 ◽

Cited By ~ 7

Author(s):

Marat Asamatdinov ◽

Andrey Medvedev ◽

Alexey Zhukov ◽

Ervand Zarmanyan ◽

Alexey Poserenin

Keyword(s):

Heat Treatment ◽

Theoretical Basis ◽

Building Materials ◽

Model Material ◽

Natural State ◽

Multicomponent Systems ◽

Optimum Temperature ◽

Natural Clay ◽

Technological Parameters ◽

Natural Composites

Clay-gypsum of each deposit are ecologically safe natural materials. They differ from others in their mineralogical and phase composition, they have different properties. Such a spread of properties of natural clay-gypsum, including after their heat treatment, makes it difficult to process them and, ultimately, use. The factor of "unpredictability of the obtained results" is one of the reasons why this type of natural composites are practically not used in modern construction. The paper presents the results of studies of the properties of model compositions of a clay-gypsum binder. The theoretical basis of the research is the methodology for the creation of new building materials, developed at the MSUCE. According to the proposed provisions, the properties of composite (or multicomponent) systems can be evaluated using the concept of a model body, in our case a "model material", manufactured with observance of certain technological parameters. According to the results of the first stage, the optimum temperature for calcination of an artificial clay-gypsum binder (which was 230-250°C) was established, and a graphical interpretation of the results was carried out using triple diagrams. By results of researches it is established, that the majority of natural structures in the natural state, or after modification can be used as a basis for reception of interior plaster mixes.

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The impact of nozzle configuration on the heat transfer coefficient

Archives of Materials Science and Engineering ◽

10.5604/01.3001.0012.0609 ◽

2018 ◽

Vol 1 (90) ◽

pp. 16-24 ◽

Cited By ~ 1

Author(s):

K. Krupanek ◽

A. Staszczyk ◽

J. Sawicki ◽

P. Byczkowska

Keyword(s):

Heat Transfer ◽

Heat Treatment ◽

Production Process ◽

Sample Surface ◽

Production Costs ◽

Individual Element ◽

Treatment Technology ◽

Nozzle Configuration ◽

Dimensional Simulation ◽

The Impact

Purpose: The purpose of this paper is to elaborate guidelines regarding geometric configurations of a nozzle manifold that have an impact on the effectiveness of the quenching process and occurrence of quenching distortions. Design/methodology/approach: Within the framework of this study there an optimisation of nozzle manifold geometry was carried out with the help of numerical simulations created using Ansys CFX software. In the first stage, a simplification of the nozzle-sample system reduced to a two-dimensional simulation was employed to determine the most optimal location of the coolant stream. In the second stage, several arrangements of nozzle manifolds were tested in a three-dimensional simulation. The parameters that were taken into account included the rate of sample cooling, the uniformity of cooling with a sample volume and heat coefficient takeover read from its surface. Findings: The different active/inactive nozzle arrangements within the manifold and the impact of the specific arrangements on the uniformity of heat transfer from the sample surface were compared. Research limitations/implications: The simulations carried out within the framework of this study are one of the elaboration stages of a new flow heat treatment technology. Practical implications: The application of an efficient cooling chamber in flow treatment makes it possible to limit quenching distortions to a minimum. An optimal adjustment of cooling parameters and cooling nozzle configuration to the shape of the element in order to make the cooling uniform translate directly into a reduction in distortions. Avoiding the necessity to reduce distortions after quenching means there is a significant reduction in detail production costs (grinding). Originality/value: The concept of single-piece flow in the heat treatment for the mass industry is developing rapidly and constitutes a fully automated element of a manufacturing line, adjusted for the purposes of being included in the production process automatic control system. It also makes it possible to conduct comprehensive and integration quality supervision and management at the level of an individual element, which is not possible in the case of batch heat treatment, which is a gap in the production process.

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Using the calculation method for low-melting clay assessment

MATEC Web of Conferences ◽

10.1051/matecconf/201819604014 ◽

2018 ◽

Vol 196 ◽

pp. 04014

Author(s):

Natalia Chumachenko ◽

Vladimir Turnikov ◽

Vladimir Kuzmin

Keyword(s):

Building Materials ◽

Raw Materials ◽

Size Composition ◽

Program Assessment ◽

Raw Material ◽

Technological Parameters ◽

Engineering Structures ◽

Firing Range ◽

Standard Assessment ◽

Melted Material

Low-melting polymineral clays are widely used in building ceramics production. The properties of ceramic products depend on many factors. The paper describes properties of low-melting clay from Belebey deposit, Bashkiria. Using mathematical statistics methods, researchers make statistical analysis of grain size composition of clay raw material on Belebey brick factory and also analyze amount of sand additives and mixing moisture content. The study of general and technological properties of clay raw materials, and materials obtained from this raw material, was carried out in accordance with existing regulations using chemical, differential-thermal and non-standard methods. According to chemical analysis, non-standard assessment of clay raw materials was carried out by means of computer program "Assessment", developed at the Department of Building Materials Production and Engineering Structures. The method of calculating quantity and composition of melted material, formed in ceramic masses during firing, using known diagrams of aluminosilicate systems state is used. The assessment made it possible to determine maximum firing temperature and firing range and additives improving clinker formation. The studies show that calculation indicators are consistent with experimental data. They can be used for quick assessment of raw materials properties when changing its composition, and in adjustment of technological parameters of production.

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Development of new culinary products derived from black sea grey mullet

Proceedings of the Voronezh State University of Engineering Technologies ◽

10.20914/2310-1202-2020-2-67-71 ◽

2020 ◽

Vol 82 (2) ◽

pp. 67-71

Author(s):

O. N. Krivonos ◽

N. V. Dolganova ◽

V. V. Bolomolova

Keyword(s):

Heat Treatment ◽

Black Sea ◽

Raw Materials ◽

Raw Material ◽

The Black Sea ◽

Technological Parameters ◽

Fish Fillet ◽

Long Term Storage ◽

Organoleptic Characteristics ◽

Sous Vide

The increasing in tourist flow to the Republic of Crimea, as well as the acceleration of the pace of life of the population led to an increase in demand for finished fish culinary products. In this regard, there is a need to create a new fish culinary product of long-term storage from the raw materials of the Azov-Black Sea basin. The Black Sea mullet (Mugil cephalus) was chosen as fish raw material, the catch volume of which has been steadily increasing in recent years. Sous-vide technology - is a progressive technology, which is characterized by low-temperature modes of heat treatment, resulting in a product with unique organoleptic characteristics that are superior to traditional types of processing of fish raw materials. Fish and vegetables prepared using the sous-vide technology are distinguished by tenderness and juiciness, the aroma of the finished dish is enhanced. During the development of new product technology, the optimal technological parameters (temperature and process duration) were determined for heat treatment of fish fillet in vacuum based on mathematical modeling. The research was carried out on the equipment of the sector of technologies of processing of water biological resources of the department "Kerchenskiy" of the Azov-Black Sea branch of Russian Federal Research Institute of Fisheries and Oceanography. Heat treatment of samples was carried out in a water bath of LB-63 according to the plan of an experiment in the range from 55 to 70 ? with lasting from 15 to 30 min. For packing of a product the vacuum device Solis Vac Premium was used. A regression model was constructed consisting of the objective function determined by the microbiological index QMAFAnM. The software "STATGRAPHICS Plus Version 5.0" was used to plan the experiment and determine the optimal technological parameters of the fish culinary product..

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Application of the Protective Coating for Blade’s Thermal Protection

Energies ◽

10.3390/en14010050 ◽

2020 ◽

Vol 14 (1) ◽

pp. 50

Author(s):

Andrzej Frąckowiak ◽

Aleksander Olejnik ◽

Agnieszka Wróblewska ◽

Michał Ciałkowski

Keyword(s):

Heat Transfer ◽

Heat Transfer Coefficient ◽

Heat Conduction ◽

Porous Material ◽

Transfer Coefficient ◽

Protective Coating ◽

Thermal Protection ◽

Protective Layer ◽

Entire Volume ◽

The Given

This paper presents an algorithm applied for determining temperature distribution inside the gas turbine blade in which the external surface is coated with a protective layer. Inside the cooling channel, there is a porous material enabling heat to be transferred from the entire volume of the channel. This algorithm solves the nonlinear problem of heat conduction with the known: heat transfer coefficient on the external side of the blade surface, the temperature of gas surrounding the blade, coefficients of heat conduction of the protective coating and of the material the blade is made of as well as of the porous material inside the channel, the volumetric heat transfer coefficient for the porous material and the temperature of the air flowing through the porous material. Based on these data, the distribution of material porosity is determined in such a way that the temperature on the boundary between the protective coating and the material the blade is made of is equal to the assumed distribution To. This paper includes results of calculations for various thicknesses of the protective coating and the given constant values of temperature on the boundary between the protective coating and the material the blade is made of.

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Effect of Thermophysical Properties of Solid Walls on Turbulent Modes of Complex Heat Transfer in an Enclosure

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.683.540 ◽

2016 ◽

Vol 683 ◽

pp. 540-547

Author(s):

Igor V. Miroshnichenko ◽

Mikhail A. Sheremet

Keyword(s):

Heat Transfer ◽

Thermophysical Properties ◽

Building Materials ◽

Temperature Fields ◽

Main Attention ◽

Numerical Studies ◽

Internal Surfaces ◽

Complex Heat Transfer ◽

Energy Efficient Building ◽

Solid Walls

Two-dimensional numerical studies were performed for investigation of the effect of thermophysical properties of solid walls on turbulent convective – radiative heat transfer in an air filled square cavity. The main attention was paid to the influence of thermal conductivity ratio1 ≤ κ1, 2 ≤ 1000 and an emissivity of internal surfaces of the solid walls 0 £ < 1 on velocity and temperature fields. Numerical results were obtained by means of the finite difference method. The effect of the governing parameters on the average Nusselt number has been defined. The obtained results provide better technical support for development and research of energy-efficient building materials

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Influence of Forced Carbonisation on the Binding Properties of Sludge with a High β-Belite Content

Materials ◽

10.3390/ma14247899 ◽

2021 ◽

Vol 14 (24) ◽

pp. 7899

Author(s):

Aleksandr Bakhtin ◽

Nikolay Lyubomirskiy ◽

Stanisław Fic ◽

Tamara Bakhtina

Keyword(s):

Compressive Strength ◽

Building Materials ◽

Average Density ◽

Raw Material ◽

Production Cycle ◽

Co2 Absorption ◽

Material Base ◽

Technological Parameters ◽

Alumina Production ◽

Insoluble Compounds

Alternative binders activated by forced carbonisation are regarded as one of the potential solutions to reducing greenhouse gas emissions, water, and energy consumption. Such binders, in particular those based on nepheline sludge (a by-product of alumina production), cured in carbon dioxide with subsequent hydration, are clinkerless building materials. The development of such binders contributes to the involvement of multi-tonnage solid industrial waste in the production cycle. This type of waste is capable of binding man-made CO2 and transforming it into stable insoluble compounds, having binder properties. The optimum technological parameters of the forced carbonisation of the nepheline slime binder was determined by the mathematical planning of the experiment. The novelty of the research is the expansion of the secondary raw material base that can bind the man-made CO2 with obtaining the construction products of appropriate quality. It was revealed that the process of active CO2 absorption by the minerals of nepheline slime is observed in the first 120 min of the forced carbonization. Immediately after carbonisation, the resulting material develops compressive strength up to 57.64 MPa, and at the subsequent hydration within 28 days this figure increases to 68.71 MPa. Calcium carbonate is the main binder that determines the high mechanical properties of the samples. During the subsequent hydration of the uncoated belite, gel-like products are formed, which additionally harden the carbonised matrix. Thus, after the forced carbonisation and the following 28 days of hardening, the material with compressive strength in the range 4.38–68.71 MPa and flexural strength of 3.1–8.9 MPa was obtained. This material was characterised by water absorption by mass in the range of 13.9–23.3% and the average density of 1640–1886 kg/m3. The softening coefficient of the material was 0.51–0.99. The results obtained enables one to consider further prospects for research in this area, in terms of the introduction of additional technological parameters to study the process of forced carbonisation of nepheline slime.

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