EFD热模拟材料热辐射系数表.docx

Emissivity Coefficients of some common MaterialsThe radiation heat transfer emissivity coefficient of some common materials as aluminum, brass, glass and many moreThe emissivity coefficient - - indicates the radiation of heat from a grey body according the Stefan-Boltzmann Law, compared with the radiation of heat from a ideal black body with the emissivity coefficient = 1.The emissivity coefficient - - for some common materials can be found in the table below. Note that the emissivity coefficients for some products varies with the temperature. As a guideline the emmisivities below are based on temperature 300 K.Surface MaterialEmissivity Coefficient- -Alloy 24ST Polished0.09Alumina, Flame sprayed0.8Aluminum Commercial sheet0.09Aluminum Foil0.04Aluminum Commercial Sheet0.09Aluminum Heavily Oxidized0.2 - 0.31Aluminum Highly Polished0.039 - 0.057Aluminum Anodized0.77Aluminum Rough0.07Aluminum paint0.27 - 0.67Antimony, polished0.28 - 0.31Asbestos board0.96Asbestos paper0.93 - 0.945Asphalt0.93Basalt0.72Beryllium0.18Beryllium, Anodized0.9Bismuth, bright0.34Black Body Matt1.00Black lacquer on iron0.875Black Parson Optical0.95Black Silicone Paint0.93Black Epoxy Paint0.89Black Enamel Paint0.80Brass Dull Plate0.22Brass Rolled Plate Natural Surface0.06Brass Polished0.03Brass Oxidized 600oC0.6Brick, red rough0.93Brick, fireclay0.75Cadmium0.02Carbon, not oxidized0.81Carbon filament0.77Carbon pressed filled surface0.98Cast Iron, newly turned0.44Cast Iron, turned and heated0.60 - 0.70Chromium polished0.058Concrete0.85Concrete, rough0.94Concrete tiles0.63Cotton Cloth0.77Copper electroplated0.03Copper heated and covered with thick oxide layer0.78Copper Polished0.023 - 0.052Copper Nickel Alloy, polished0.059Glass smooth0.92 - 0.94Glass, pyrex0.85 - 0.95Gold not polished0.47Gold polished0.025Granite0.45Gypsum0.85Ice smooth0.966Ice rough0.985Inconel X Oxidized0.71Iron polished0.14 - 0.38Iron, plate rusted red0.61Iron, dark gray surface0.31Iron, rough ingot0.87 - 0.95Lampblack paint0.96Lead pure unoxidized0.057 - 0.075Lead Oxidized0.43Lime wash0.91Magnesium Oxide0.20 - 0.55Magnesium Polished0.07 - 0.13Marble White0.95Masonry Plastered0.93Mercury liquid0.1Mild Steel0.20 - 0.32Molybdenum polished0.05 - 0.18Nickel, elctroplated0.03Nickel, polished0.072Nickel, oxidized0.59 - 0.86Nichrome wire, bright0.65 - 0.79Oak, planed0.89Oil paints, all colors0.92 - 0.96Paper offset0.55Plaster0.98Platinum, polished plate0.054 - 0.104Porcelain, glazed0.92Paint0.96Paper0.93Plaster, rough0.91Plastics0.91Porcelain glazed0.93Quartz glass0.93Roofing paper0.91Rubber, hard glossy plate0.94Rubber Nat Hard0.91Rubber Nat Soft0.86Sand0.76Sawdust0.75Silicon Carbide0.83 - 0.96Silver Polished0.02 - 0.03Steel Oxidized0.79Steel Polished0.07Stainless Steel, weathered0.85Stainless Steel, polished0.075Stainless Steel, type 3010.54 - 0.63Steel Galvanized Old0.88Steel Galvanized New0.23Tile0.97Tin unoxidized0.04Titanium polished0.19Tungsten polishe