Effective thermal conductivity of multiple-phase transversely isotropic material having coupled thermal system

Hassan, S; Israr, Asif; Ali, Haider; Aslam, W

doi:10.1201/b20958-52

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“…Before this time the effective thermal conductivity could be solved by the difficult systems of equations, which taking into account radiation and convection inside the pores [7,8]. These equations have many simplifications and semi-empirical factors (i.e.…”

Section: Literature Reviewmentioning

confidence: 99%

Finding of the generalized equation of thermal conductivity for porous heat-insulating materials

Cheilytko¹

2016

TAPR

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Досліджено вплив конвекції в замкнутих порах на коефіцієнт ефективної теплопровідності теплоізоляційного матеріалу. Визначено загальний характер розподілу швидкостей ліній току конвекції в замкнутій сферичній порі з діаметрами 2-20 мм. Встановлено найбільш значимі фактори впливу на коефіцієнт ефективної теплопровідності за допомогою регресійного аналізу. Надано рекомендації щодо створення нових крупнопористих теплоізоляційних матеріалів.Ключові слова: конвекція, замкнута сферична пора, регресійний аналіз, ефективна теплопро-відність.Cheilytko A. IntroductionThe prospects of using of porous heat-insulating materials in the industry don't in doubt [1][2][3]. New porous materials appear every year. Such materials are used as heat-insulating for houses, constructions, pipelines, furnaces, dryers and other industrial equipment. In [4] the creation of new porous heat-insulating heat-proof material on the basis of composite binder and gas agent was described, but thermal properties of such material weren't given and the possibility of porosity regulation wasn't described. Despite the fact that porosity (quantity, size and pores form) influences on the effective thermal conductivity [5,6].The generalized equation of thermal conductivity is needed for assessing of the future effective thermal conductivity of porous material, but it doesn't exist. Also the generalized equation will allow controlling the thermal conductivity of porous material at the pores formation stage without numerous experiments. So, finding of the generalized equation of thermal conductivity of porous heat-insulating materials is an actual scientific task, which is useful for the industry. The object of the research and its technological auditThe object of research is the heat transfer through porous insulating materials. The most famous problem is the lack of generalized equation of thermal conductivity, it doesn't allow to predict the effective thermal conductivity of the material at the structure formation stage. The reason of it is lack of complex entrance independent factors of porous structure that influence on the effective thermal conductivity. For determining of this factors the computer simulation was used, results of it was confirmed by laboratory experiment. For finding of the generalized equation of thermal conductivity of porous heat-insulating materials the experimental design method was used. Disadvantages of the obtained equation are the narrowed application boundaries, the pore size of 2 mm, the thermal conductivity of the basic material without pores is 0,95 W/(m ⋅ K). The aim and objectives of the researchThe aims of this work are creation of the generalized equation of thermal conductivity of porous heat-insulating materials and give the practical recommendations for structure formation of such materials.To achieve that aims, next objectives must be solved: 1. Research the influence of the convection in the pores on the thermal resistance by the computer simulation.2. Confirm the obtained dependencies by the practical experiment ...

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Section: Literature Reviewmentioning

confidence: 99%

Finding of the generalized equation of thermal conductivity for porous heat-insulating materials

Cheilytko¹

2016

TAPR

View full text Add to dashboard Cite

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Effective thermal conductivity of multiple-phase transversely isotropic material having coupled thermal system

Cited by 1 publication

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Finding of the generalized equation of thermal conductivity for porous heat-insulating materials

Finding of the generalized equation of thermal conductivity for porous heat-insulating materials

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