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Experimental investigation on the effect of aluminum foam on natural convection in horizontal channel heated below

Natural convection of air in horizontal parallel plates without and with aluminum foam is experimentally and numerically investigated. The lower wall is heated at uniform heat flux and the upper parallel plate is not thermally insulated to the external ambient. The investigation is carried out by means of a visualization technique and heated wall temperature measurements. The investigated aluminum foam had 10 and 30 Pores per Inches (PPI). The considered configurations are compared and it is found that the presence of the aluminum foam determines a better thermal heat transfer with respect to the clean channel with a low emissivity whereas higher heated wall temperature values with respect to the clean channel with the heated lower plate at high emissivity. Flow visualization is carried out to detect the development and the shape of the main flow and the transitions along the channel. Results of the visualization allow the description of secondary motions inside the channel. Key-Words: Natural convection, Aluminum foams, Horizontal channel, partially filled with porous foam