Thermophysical properties of refractories in a rarefied gaseous medium

Litovskii, E. Ya.; Puchkelevich, N. A.; Landa, Ya. A.

doi:10.1007/bf01319638

Cited by 28 publications

(6 citation statements)

References 1 publication

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“…Since the classical steady-state methods are time-consuming, development of transient express methods for the measurement of thermophysical properties for a wide temperature range is the current problem. Examples of such methods in conditions of gas emissions, phase and structural transformations are described in (Luikov, 1966;Litovsky, 1970;Litovsky and Puchkelevich, 1982;Fedina et al, 1997;Gambaryan-Roisman, 2003;Kubicar and Bohac, 2005). …”

Section: Discussionmentioning

confidence: 97%

“…Apparent thermal conductivity of porous materials is given by (Luikov, 1966;Litovsky, 1979;Litovsky and Polonsky, 1979;Litovsky et al, 1981;Litovsky and Puchkelevich, 1982;Litovsky et al, 1990;Litovsky et al, 1996;Fedina et al, 1997;Litovsky et al, 1997a;Litovsky, 1997a,b;Litovsky et al, 1997b;Litovsky and Kleiman, 2001;Litovsky et al, 2001a;Litovsky et al, 2001b;Litovsky et al, 2002a;Litovsky et al, 2002b;Gambaryan-Litovsky et al, 2004;Roisman et al, 2003;:…”

Section: Apparent Thermal Conductivitymentioning

confidence: 99%

“…To calculate the radiative component of l app , the extinction coefficient, k, in Equation (10) was obtained from (Litovsky and Puchkelevich, 1982):…”

Section: Thermal Conductivity Of Epsmentioning

confidence: 99%

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Modeling and Database Development of Conductive and Apparent Thermal Conductivity of Moist Insulation Materials

Mar

Litovsky

Kleiman

2008

Journal of Building Physics

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Computer simulation and modeling of coupled heat and moisture transfer are becoming increasingly significant for accurate calculations of heat and moisture transfer. However, to solve their equations, the true component, l, of apparent thermal conductivity, l app , as a function of temperature, moisture content, and material structure is required. An approach to the development of a comprehensive database for l is discussed. Its key feature is demonstrated by the development of a theoretical model for l and l app of two common building insulation materials -expanded polystyrene insulation and highly porous calcium silicate -for a wide range of temperature and moisture conditions.

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Section: Discussionmentioning

confidence: 97%

Section: Apparent Thermal Conductivitymentioning

confidence: 99%

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Modeling and Database Development of Conductive and Apparent Thermal Conductivity of Moist Insulation Materials

Mar

Litovsky

Kleiman

2008

Journal of Building Physics

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“…As we know, the cause of the occurrence of heat stresses in details is the presence of a temperature gradient in them [10]. Due to the relatively low thermal conductivity of the most ceramic materials (less than 10 W/ m•K) [11] with one-direction thermal action, a temperature gradient appears inside the thermal insulation. At the same time, thermal insulation materials have a relatively high coefficient of thermal expansion (1-2•10 -5 К -1 ) [12].…”

Section: Research Methodology and Resultsmentioning

confidence: 99%

Research of heat stresses in components of blast furnace tuyere

2018

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Using computer simulating in Deform 2D it was researched the effect of insert thickness and air gap size, separating it from the internal cylinder, on temperature pattern and stresses in the insert and the internal cylinder. It was shown, that with the increase a clearance between the insert and the internal cylinder and with increase the insert thickness, weight average values of voltage decrease in it. They have been more evenly spread with increases of insert thickness. In tuyere design it was offered increasing it thickness to 13 mm for hardening. Key words: tuyere, blast furnace, insulation insert, internal cylinder, temperature pattern, stress.

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“…The original data for the calculation (chamotte--graphite refractory material and type 45 steel were selected) is given in the reference literature [7][8][9].…”

Section: ~T(tlc=~omentioning

confidence: 99%

An analysis of the temperature field in the refractory feeder of a horizontal continuous billet casting machine

et al. 1988

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Among the promising directions in the development of continuous casting of steel is casting of steel in horizontal continuous casting machines [i, 2].A very important part of this machine is the part for delivery of the metal from the metal receiver to the water-cooled mold (Fig. I). A feature of a horizontal continuous casting machine distinguishing it from other designs of continuous casting machines is direct connection through a fitting of the refractory metal line and the watercooled mold which, on the one hand~ prevents the possibility of secondary oxidation of the metal supplied to the mold while, on the other, it makes more severe the service conditions of th~ face portion of the metal line in contact with the mold material. Obviously, the portion of the metal line (feeder) located in contact with the mold or in a butt joint with the mold is made of a more wear-resistance refractory than the whole metal line [i, 3].In the horizontal method of continuous casting of steel, the refractory feeder fulfills the function of the first zone of the mold and solidification of the skin of the billet starts on the surface of the refractory of this portion, which in combination with the interrupted character of withdrawal of the billet from the mold and, consequently, the cyclic character of the skin of the billet on the refractory, has a significant influence on the life of the refractory and the quality of the billet and determines the reliability and effectiveness of operation of the machine [I, 4].To select the optimum design parameters of the refractory feeder-mold assembly and also to obtain information on the conditions of solidification of the billet skin with the selected design of this assembly it: was necessary to develop an appropriate mathematical model of the process. The model is the theoretical basis for planning of experimental tests for the purpose of optimication of the design and technical decisions for the investigated assembly of the continuous casting machine.The unique service conditions of the refractory feeder for the horizontal continuous casting machine determines the complex character of the temperature field in the portion of the refractory in contact with the copper water-cooled mold. On one side the refractory is in contact with molten steel, and on another with the surface of the mold, the temperature of which does not exceed 500~ and on the third with the molten steel and the cyclically freezing skin of the billet. The design features of the continuous casting machine make difficult measurements in service of the temperature field in the refractory.The withdrawal process includes movement and stoppage (Fig. 2a). As the result in each withdrawal cycle solidification of the metal, the formation of the skin of the billet both on the wall of the mold and in some portion of the refractory feeder, occurs. To a known degree the length of this portion determines the quality of the billet cast. Figure 2b shows the process of formation of the skin of the billet during the time of a single cycle....

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Thermophysical properties of refractories in a rarefied gaseous medium

Cited by 28 publications

References 1 publication

Modeling and Database Development of Conductive and Apparent Thermal Conductivity of Moist Insulation Materials

Modeling and Database Development of Conductive and Apparent Thermal Conductivity of Moist Insulation Materials

Research of heat stresses in components of blast furnace tuyere

An analysis of the temperature field in the refractory feeder of a horizontal continuous billet casting machine

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