Mathematic modeling of the kinetics of heat-and-humidity state of capillary-porous bodies under convection drying

Kovalnogov, Vladislav N.; Karpukhina, Tamara V.; Korotkov, Evgeny A.

doi:10.1063/1.4952241

Cited by 13 publications

(6 citation statements)

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“…The mathematical model and the procedure of the numerical study of the kinetics of the state of heat and humidity of the capillary-porous body, constructed on the simultaneous solution of the equation of thermal conductivity and moisture transmission, were proposed in paper [10]. However, these studies are characteristic of inorganic material, and it is impossible to apply them to timber.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Regularities in the washing out of water-soluble phosphorus-ammonium salts from the fire-protective coatings of timber through a polyurethane shell

Tsapko

Vasylyshyn

Melnyk

et al. 2021

EEJET

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The analysis of fire-protective materials for wooden building structures was carried out and the need to develop reliable methods for studying the process of washing out fire retardants from the surface of the building structure, which is necessary for the creation of new types of fire-protective materials, was established. That is why there arises a need to determine the conditions for the formation of a barrier for washing out and to establish a mechanism for inhibition of moisture transmission to the material. In this regard, a mathematical model was built of washing out fire retardants using a polymeric shell made of organic material as a coating, which makes it possible to estimate the effectiveness of a polymer shell by the amount of the washed-out fire retardant. According to the experimental data and theoretical dependences, the dynamics of the release of fire retardants from the fire-protective layer of the coating was calculated; it did not exceed 1.0 %, and therefore, ensures fire protection of timber. The results of determining the weight loss of the sample under the influence of water indicate the ambiguous impact of the nature of protection on the washout. In particular, this implies the availability of data sufficient for performing a high-quality process of moisture diffusion inhibition and, based on it, detection of the moment, from which a decrease in efficiency of a coating begins. The experimental studies proved that a sample of fire-protected timber after exposure to water for 30 days withstood the influence of a heat flow. In particular, the loss of timber weight after the temperature exposure was less than 6 %, and the temperature of flue gases did not exceed 185 °C. Thus, there is a reason to assert the possibility of directed control of the processes of fire protection of timber through the use of polymer coatings capable of forming a protective layer on the surface of fire-protected material, which inhibits the rate of washing out the fire retardants

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Section: Literature Review and Problem Statementmentioning

confidence: 99%

Regularities in the washing out of water-soluble phosphorus-ammonium salts from the fire-protective coatings of timber through a polyurethane shell

Tsapko

Vasylyshyn

Melnyk

et al. 2021

EEJET

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show abstract

“…Paper [13] proposed a mathematical model and a procedure for numerical study into the kinetics of the state of heat and humidity of a capillary-porous body, built on the simultaneous equation for solving thermal conductivity and moisture transfer. However, the cited study is characteristic of inorganic material and cannot be attributed to wood.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

“…After integrating (13) for x in the range from 0 to R and appropriate transformations we obtain: (16) Using boundary conditions (11), (12), we obtain:…”

Section: Modeling Parameters Of Moisture Diffusion Through a Flame-rementioning

confidence: 99%

Modeling the process of moisture diffusion by a flame-retardant coating for wood

Tsapko

Bondarenko

2020

EEJET

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“…Математическое моделирование и численное исследование проводили в целях получения априорной информации для разработки технологии обогащения пеллет рециркулируемыми уходящими газами в части назначения ее режимов. В соответствии с подходом, изложенным в работе [5], моделирование проводили на основе сопряженного решения задач нестационарной теплопроводности и влагопереноса. …”

Section: Introductionunclassified

Development and research of technology of enrichment of low-grade solid fuels by recirculated exhaust gases for boiler plants

Boyarkin¹,

Kovalnogov²,

Karpukhina³

et al. 2016

Mod. Sci. Res. Ids. Rslt. Technol.

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Mathematic modeling of the kinetics of heat-and-humidity state of capillary-porous bodies under convection drying

Cited by 13 publications

References 0 publications

Regularities in the washing out of water-soluble phosphorus-ammonium salts from the fire-protective coatings of timber through a polyurethane shell

Regularities in the washing out of water-soluble phosphorus-ammonium salts from the fire-protective coatings of timber through a polyurethane shell

Modeling the process of moisture diffusion by a flame-retardant coating for wood

Development and research of technology of enrichment of low-grade solid fuels by recirculated exhaust gases for boiler plants

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