A Model of Moist Polymer Foam and a Scheme for the Calculation of Its Thermal Conductivity
Vadim I. Nikitsin , Abdrahman Alsabry , Valery A. Kofanov , Beata Backiel-Brzozowska , Paweł Truszkiewicz
AbstractThis paper proposes a method for determining an effective value of the thermal conductivity for moist, highly porous rigid polymer foams. The model of moist foam based on an ordered structure with interpenetrating components was developed in accordance with the moisture distribution in the pore space. With small moisture content, isolated water inclusions are formed, and the pore space is considered as a binary system (vapor-gas mixture and water) with isolated inclusions. With an increase in moisture content, isolated water inclusions merge, forming a continuous layer, and pore space is considered as a binary system of interpenetrating components. The thermal conductivity of the vapor-gas mixture is represented as the sum of the thermal conductivity of the dry gas and the thermal conductivity of the vapor caused by the diffusion transfer of vapor in the pore space, taking into account the coefficient of vapor diffusion resistance. Using the proposed scheme of calculation, a computational experiment was performed to establish the influence of the vapor diffusion, moisture content, and average temperature of the foam on its thermal conductivity.
|Journal series||Energies, [ENERGIES], ISSN 1996-1073, (N/A 140 pkt)|
|Publication size in sheets||0.5|
|Keywords in English||thermal conductivity; polymer foam; moisture diffusion; porous structure modeling|
|Internal identifier||ROC 19-20|
|License||Journal (articles only); published final; ; with publication|
|Score||= 140.0, 12-02-2020, ArticleFromJournal|
|Publication indicators||: 2018 = 1.156; : 2018 = 2.707 (2) - 2018=2.99 (5)|
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.