Abstract
This paper presents the results of mathematical modelling of turbulent natural convection under conditions of the conjugate heat transfer in an open cavity heated by infrared emitter. Two-dimensional problem of heat transfer was formulated in the vorticity - stream function - temperature dimensionless variables and solved by means of the finite difference method on a uniform grid. According to the results of numerical analysis, the fields of differential and integral heat transfer characteristics, illustrating the unsteady nature of the thermophysical process under study, were obtained. The nonlinear dependence of the average Nusselt number versus dimensionless time ( τ ) was established. It was shown that the average Nusselt number monotonically increased in a range of 800 τ <2000
Highlights
Prediction of thermal regimes of large-scale heat supply objects with radiant heating system is a complex problem
The basic laws of jointly proceeding processes of conduction, convection and radiation under operating conditions of infrared emitters (IE) have not been studied at the level providing energy-efficient use of these systems. It is known [1, 2] that investigation of heat transfer process in areas with radiant heating sources is advantageously conducted with applying of mathematical modelling methods
Proceeding processes of conduction and turbulent natural convection is described by the Navier - Stokes and energy equations
Summary
Prediction of thermal regimes of large-scale heat supply objects with radiant heating system is a complex problem. The basic laws of jointly proceeding processes of conduction, convection and radiation under operating conditions of infrared emitters (IE) have not been studied at the level providing energy-efficient use of these systems. It is known [1, 2] that investigation of heat transfer process in areas with radiant heating sources is advantageously conducted with applying of mathematical modelling methods. Investigation of the heat transfer process in a local domain of large-scale area is of great interest. The aim of this study is mathematical modelling of turbulent natural convection in a local domain of the large-scale area under conditions of the radiant energy supply
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