Laminar and Turbulent Natural Convection Simulation with Radiation in Enclosure

2016 ◽  
Vol 818 ◽  
pp. 3-11
Author(s):  
M. Hussen Hasanen ◽  
Hussein J. Akeiber
Keyword(s):  
Heat Transfer ◽  
Heat Exchange ◽  
Temperature Distribution ◽  
Convective Heat ◽  
Convective Heat Exchange ◽  
Turbulent Natural Convection ◽  
Heating Efficiency ◽  
Partial Heating ◽  
Different Types ◽  
Floor Heating

Several features of heat transfer on enclosing surfaces are discussed including temperature distributions in a room heated by a floor heater. Numerical analyses on radiative and convective heat transfer were carried out against several partial floor heating. Partial floor heating produces different types of temperature distribution between the heated and non-heated places, which is a remarkable characteristics found out in this study. In the heated places, the temperature distribution is almost the same as that of typical floor heating. However, in the non-heated places, air temperature differs by 6 °C (3.6 °Difference) between a point near the floor surface and a point well above that. Heating efficiency of partial heating slightly depends on the set place as well as its Area. Moreover, convective heat exchange constitutes approximately half of the total heat exchange

Experimental Aero-Thermal Characterization of a Circular Jet Impinging a Plate: Influence of Impingement Flow Mach Number on Convective Heat Exchange Radial Distribution

2008 ◽  
Author(s):  
Gildas Lalizel ◽  
Christophe David ◽  
Matthieu Fe´not ◽  
Eva Dorignac
Keyword(s):  
Heat Transfer ◽  
Heat Exchange ◽  
Mach Number ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Convective Heat Exchange ◽  
Industrial Applications ◽  
Temperature Fields ◽  
Transfer Coefficients ◽  
Heat Transfers

Impingement jets are known to be efficient mechanisms for the exchange of heat between fluid and structure. They are generally used in industry for cooling, heating or drying. Several experimental and numerical studies have been realized to study convective heat transfers and/or to correlate the convective heat transfers to the wall with the unsteady flow of the jet (O’Donovan et al. [9] [10]). But these studies have been performed at low Mach number whereas higher Mach number are found in industrial applications as fan cooling processes for instance (M = 0.5 to 0.8). So, we propose to study the influence of Mach number of the impingement flow, ranging from 0.1 to 0.8, on convective heat exchange between a circular jet and a round axisymmetric plate. The aerodynamic of the fluid and the heat transfers depend on the following parameters: the D hydraulic diameter of the jet, the H distance to the wall, the Re Reynolds number of the flow, the M Mach number and the Tj temperature of the jet. The local convective heat transfer coefficients are experimentally determined by an inverse method based on a measurement of steady state temperature fields by infrared thermography (Fe´not et al. [2]) for 1 ≤ H/D ≤ 5 and 0.1 ≤ M ≤ 0.8. An experimental study of radial velocity fluctuations of the fluid in nearby wall has also been realized from hot wire anemometry. A spatial and temporal turbulent study (turbulence spectrum, integral turbulent scales, dissipation rate) allows to correlate convective heat transfer to the wall to aerodynamic phenomena.

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