Abstract
Mathematical modelling of turbulent natural convection in a semi-open cavity with a heat-conducting walls of finite thickness with radiant heating of internal boundaries was performed. Two-dimensional problem of the conjugate heat transfer was solved by means of the finite difference method. Scale influence of open boundaries and radiant heating of the gas – wall interfaces on the formation of differential and integral heat transfer characteristics was established. An increase in the dimensionless time ( τ ) led to displacement of extremum temperatures in the typical cross section (Y = 0.5) to an open vertical boundary. The average Nusselt number monotonically increased at the gas – a wall interfaces in a range of 400 τ <1200.
Highlights
It is known [1] that the convective heating of air masses is appropriate only for heating of small premises
In the case of large industrial buildings, where only a small part of the useful area is used prospectively to apply radiant heating systems based on gas infrared emitters (GIE) [2,3]
Investigations of conjugate natural convection regimes were conducted for the following dimensionless criteria corresponding to the turbulent flow: Ra 108, Prt 1, Pr=0.71, Ki1 42.86, Ki2 21.43 . fig. 2 presents typical fields of temperature and stream function illustrating the influence of the non-stationarity factor and presence of the open boundary on differential heat transfer characteristics formation in the solution domain under consideration
Summary
It is known [1] that the convective heating of air masses is appropriate only for heating of small premises. In the case of large industrial buildings, where only a small part of the useful area (local working areas) is used prospectively to apply radiant heating systems based on gas infrared emitters (GIE) [2,3]. The use of radiant heating systems is currently not widespread due to the lack of a basic theory of the processes occurring when operating the GIE. For this reason, it is advisable to investigate the basic laws of heat transfer under conditions of radiant energy supply to the heating facilities. Thermal regime modelling of locally based working area is of interest
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