Open AccessNumerical study of forced convective heat exchange in spherical fillings of regular structure: determination of heat characteristics
Author(s) -
А П Королева,
М.С. Французов,
И. С. Антаненкова
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/2131/5/052077
Subject(s) - heat exchanger , thermodynamics , porous medium , porosity , mechanics , reynolds averaged navier–stokes equations , materials science , turbulence , mathematics , physics , composite material
The required operation of a heat exchanger with spherical filling depends on determining the heat characteristic of the porous medium. Using most existing dependencies to determine the heat-exchange coefficient in a porous medium gives contradictory results. This paper proposes a calculation method to determine heat characteristics of a porous medium (namely, spherical filling) using numerical modeling. This issue is addressed in a 3D setting using the RANS equation system k- ε RNG , a turbulence model, energy and state equations for gas flows through the porous medium represented as regular packed beds of three types. Two modes are considered, which differ in the working medium type and heat exchange process direction. Modeling is done to determine the following parameters; Re h =100…4·10 4 , Pr wb =0.57… 0.919, ε=0.2595… 0.4764, T wb =300… 1900 K, T w =300… 1900 K . The analysis results of the influence of the temperature factor, porosity, and heat physical properties of the working medium on the heat exchange are represented. Heat characteristics are given for each case scenario: about 360 reference points are obtained. A modified type of criterial dependency Nu sf (Re h ) is proposed and approximation coefficients are determined.