Numerical Analysis of Heat Transfer through Hollow Brick Using Finite-Difference Method

Igor V Miroshnichenko,Nikita S Gibanov,Mikhail A Sheremet

doi:10.3390/axioms11020037

Igor V Miroshnichenko, Nikita S Gibanov + Show 1 more

Open Access

https://doi.org/10.3390/axioms11020037

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Journal: Axioms	Publication Date: Jan 19, 2022
Citations: 2	License type: CC BY 4.0

Affiliation: National Research Tomsk State University

Abstract

The goal of the present work is to develop and test in detail a numerical algorithm for solving the problem of complex heat transfer in hollow bricks. The finite-difference method is used to solve the governing equations. The article also provides a detailed description of the procedure for thickening the computational grid. The flow regime inside the hollow brick is turbulent, which is a distinctive feature of this work. As a rule, if the size of the cavities in the brick is greater than 20 cm and the temperature difference in the considered solution region is significant, then the numerical solution can be obtained in the turbulent approximation. The effect of surface emissivities of internal walls on the thermal transmission and air flow inside hollow brick is investigated. The distributions of isolines of the stream function and temperature are obtained. The results report that the emissivity of interior surfaces significantly affects the heat transfer through hollow bricks.

Highlights

Over the past decades, humanity has been striving to improve the energy efficiency of buildings
Controlling the processes of natural convection inside the brick allows us to control the values of thermal resistance
It is worth noting that radiative heat transfer occurs between the walls inside the brick, which affects the overall heat transfer

Summary

Introduction

Humanity has been striving to improve the energy efficiency of buildings. This approach will lead to colossal savings in energy resources. In this regard, it is necessary to use energy-efficient building materials that have proven their effectiveness experimentally and through numerical modeling. Hollow bricks (eco-friendly construction material) are widely utilized in the construction of buildings due to their high thermal resistance. The air inside the brick has a low coefficient of thermal conductivity. Controlling the processes of natural convection inside the brick allows us to control the values of thermal resistance. It is worth noting that radiative heat transfer occurs between the walls inside the brick, which affects the overall heat transfer

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Conclusion