Conjugate Heat Transfer in a Closed Volume with the Local Heat Sources and Non-Uniform Heat Dissipation on the Boundaries of Heat Conducting Walls

Abstract.The results of numerical modeling of the process of free convective heat transfer in the regime of turbulent convection in a closed rectangular region heated by an infrared radiator are presented. The system of Navier-Stokes equations in the Boussinesq approximation is solved, the energy equation for the gas and the heat conduction equations for the enclosing vertical and horizontal walls. A comparative analysis of the heat transfer regimes in the considered region for different Grashof numbers is carried out. The features of the formation of heated air flows relative to the infrared emitter located at some distance from the upper horizontal boundary of the region are singled out.

show abstract

“…Accordingly, the statement of the problem was carried out taking this factor into account. A k-H model of turbulence was used [5,6]. …”

Section: Statement Of the Problem And Methods Of Solutionmentioning

confidence: 99%

Mathematical modeling of heat transfer in production premises heated by gas infrared emitters

et al. 2017

Self Cite

View full text Add to dashboard Cite

show abstract

“…The number of problems of conjugate heat transfer under the conditions of natural convection solved for the large characteristic dimensions areas which are typical heat supply objects is really very small [7][8][9][10]. In general it is connected with the necessity to simulate the processes of turbulent natural convection of high Grashof or Rayleigh numbers.…”

Section: Introductionmentioning

confidence: 99%

Prognostic potential of free convection models for analysis of thermal conditions of heat supply objects

2018

View full text Add to dashboard Cite

The article shows the results of mathematical simulation of convective turbulent heat transfer in the closed domain with heat-conducting walls and the source of heat emission. The system of equations in the model of thermal conductivity for the solid walls and Navier-Stokes equations for gas are solved. The article examines the possible versions of the calculation of the turbulent regime in the geometrically simple air region by means of conducting the simulation within the framework of algebraic models (Van Driest and Prandtl-Reichardt), and k-ε model. On the basis of the obtained results the authors made a conclusion about the possibility of applying the algebraic model of Prandtl to describe the integral characteristics of turbulent flows in the conditions of natural convection in a geometrically simple area when the air heated by the heat source is moved by the lifting force. Besides, the temperature fields for a typical real object of heat supply are simulated in the article. The values of the dimensionless heat exchange coefficient at the air-wall interface are determined. The comparative analysis of two quite significantly different approaches to determine the average temperature in the heated room, i. e. the traditional balance approach and the approach based on the considered system of partial differential equations is executed. It is concluded that the balance models of the calculation of the temperature regime can adequately describe real temperatures of heat supply objects only for very large values of the characteristic times of the processes in question.

show abstract

New methodology for the heat flow prediction for different construction materials

et al. 2018

View full text Add to dashboard Cite

Abstract. Among the ways of energy transfer by conduction is that of molecular interaction, in which the greater motion of a molecule at a higher energy level (temperature) imparts energy to adjacent molecules at lower energy levels. This type of transfer is present, to some degree, in all systems in which a temperature gradient exists and in which molecules of a solid, liquid, or gas are present. So, in heat transfer, the thermal conductivity of a substance is an intensive property that indicates its ability to conduct heat In particular in the building sector. The thermal flux is often measured with a mathematical analysis but for the same material, on the other hand the estimate will be disruptive and sometimes very difficult when the material changes. In this paper, a single equation for predicting heat flux of different materials is given.

show abstract

Conjugate Heat Transfer in a Closed Volume with the Local Heat Sources and Non-Uniform Heat Dissipation on the Boundaries of Heat Conducting Walls

Cited by 3 publications

References 18 publications

Mathematical modeling of heat transfer in production premises heated by gas infrared emitters

Mathematical modeling of heat transfer in production premises heated by gas infrared emitters

Prognostic potential of free convection models for analysis of thermal conditions of heat supply objects

New methodology for the heat flow prediction for different construction materials

Contact Info

Product

Resources

About