Heat-transfer and pressure drop correlations for hydrogen and nitrogen flowing through tungsten wire mesh at temperatures to 5200 deg r

Abstract : Correlations for variable property heat-transfer and friction pressure drop data were obtained for forced convection of hydrogen and nitrogen through electrically heated tungsten wire mesh. These correlations represent the data of six different helically coiled wire meshes for the following range of conditions: (i) Mesh porosity of 64 to 72.2 percent (2) Wire diameter of 0.020 to 0.035 inch (3) Surface temperature of 14000 to 52000 R (4) Outlet gas temperature of 6000 to 24000 R (s) Mass velocity for hydrogen of 0.4 to 3.1 lb/(sec)(s% ft) and for nitrogen of 4.5 to 10.2 lb/(sec)(sq ft) (6) Heat flux of 0.5 to 8.3 Btu/(sec)(sq in.) (7) Pressure level of 1 atmosphere The effect of flow bypass, resulting from a mesh heater not filling the flow passage, was investigated on a 0.030-inch-diameter wire mesh for a bypass area of 25 percent.