{"id":3513,"date":"2021-04-09T16:01:37","date_gmt":"2021-04-09T09:01:37","guid":{"rendered":"https:\/\/dbm.com.vn\/product\/uncategorized\/emissivity-natural-convection-and-radiation\/"},"modified":"2021-06-02T11:10:38","modified_gmt":"2021-06-02T04:10:38","slug":"emissivity-natural-convection-and-radiation","status":"publish","type":"product","link":"https:\/\/dbm.com.vn\/en\/product\/emissivity-natural-convection-and-radiation\/","title":{"rendered":"Emissivity \u2013 Natural convection and radiation"},"content":{"rendered":"<p><span class=\"fontstyle0\">Trolley-mounted, mobile apparatus that demonstrates how di\ufb00erent types of heat can transfer over a range of pressures; helps the understanding of the Stefan Boltzman constant.<\/span><\/p>\n<p><em><span style=\"text-decoration: underline;\">Key Features:<\/span><\/em><\/p>\n<ul>\n<li><span class=\"fontstyle0\">Includes TecQuipment\u2019s Versatile Data Acquisition System (VDAS<\/span><span class=\"fontstyle0\">\u00ae<\/span><span class=\"fontstyle0\">) Onboard<\/span><\/li>\n<li><span class=\"fontstyle0\">A self-contained, mobile, compact unit for ease of use and storage<\/span><\/li>\n<li><span class=\"fontstyle0\">Helps students to understand natural \u2018free\u2019 convection, radiation, emissivity and the StefanBoltzman equation<\/span><\/li>\n<li><span class=\"fontstyle0\">Includes a pressure vessel to allow tests above and below atmospheric pressure<\/span><\/li>\n<li><span class=\"fontstyle0\">All instruments and vacuum pump included<\/span><\/li>\n<li><span class=\"fontstyle0\">Test results are accurate enough to allow extrapolation down to a complete vacuum<\/span><\/li>\n<\/ul>\n<p><em><span style=\"text-decoration: underline;\">Description:<\/span><\/em><\/p>\n<ul>\n<li>\u00a0<span class=\"fontstyle0\">The Natural Convection and Radiation equipment allows the study of heat transfer at di\ufb00erent pressures and vacuum<\/span> .<\/li>\n<li><span class=\"fontstyle0\">It shows the di\ufb00erences between radiation and natural \u2018free\u2019 convection. It allows students to find the emissivity of a surface and verify the Stefan-Boltzman<br \/>\nequation.<\/span><\/li>\n<li><span class=\"fontstyle0\">It also gives students an understanding of the non-dimensional characteristics using Nusselt, Grasof, Prandtl and Knudsen numbers.<\/span><\/li>\n<li><span class=\"fontstyle0\">A small heated element hangs in the center of a pressure vessel. The heater has a matt black surface. Attached to its surface is a thermocouple to measure the temperature.<\/span><\/li>\n<li><span class=\"fontstyle0\">A small heated element hangs in the center of a pressure vessel. The heater has a matt black surface. Attached to its surface is a thermocouple to measure the temperature.<\/span><\/li>\n<li><span class=\"fontstyle0\">The vessel may be charged with compressed air up to 1 bar (gauge) or evacuated down to approximately 5 Pa (absolute).<\/span><\/li>\n<li><span class=\"fontstyle0\">Students can extrapolate the results down to a total vacuum (no convection). This allows them to isolate the heat transfer by radiation.<\/span><\/li>\n<li><span class=\"fontstyle0\">Instruments and a digital display measure and display the temperatures, pressures and power to the element. Instruments and a digital display measure and display the temperatures, pressures and power to the element.\u00a0<\/span><\/li>\n<li><span class=\"fontstyle0\">Included is a vacuum pump, and a regulator for an external compressed air supply.<\/span><\/li>\n<\/ul>\n<p><em><span style=\"text-decoration: underline;\">Learning Outcomes:<\/span><\/em><\/p>\n<ul>\n<li><span class=\"fontstyle0\">Determination of emissivity<\/span><\/li>\n<li><span class=\"fontstyle0\">Verification of the Stefan-Boltzmann constant<\/span><\/li>\n<\/ul>\n<p><em><span style=\"text-decoration: underline;\"><span class=\"fontstyle0\">Experiment request: <\/span><\/span><\/em><\/p>\n<ul>\n<li><span class=\"fontstyle2\">For tests with pressures above atmospheric, you also need an external supply of clean, dry compressed air at between 1.5 bar and 10 bar (not supplied)<\/span><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Product Code: TD1011<\/p>\n","protected":false},"featured_media":3127,"template":"","meta":[],"product_cat":[31,884],"product_tag":[],"_links":{"self":[{"href":"https:\/\/dbm.com.vn\/en\/wp-json\/wp\/v2\/product\/3513"}],"collection":[{"href":"https:\/\/dbm.com.vn\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/dbm.com.vn\/en\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/dbm.com.vn\/en\/wp-json\/wp\/v2\/media\/3127"}],"wp:attachment":[{"href":"https:\/\/dbm.com.vn\/en\/wp-json\/wp\/v2\/media?parent=3513"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/dbm.com.vn\/en\/wp-json\/wp\/v2\/product_cat?post=3513"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/dbm.com.vn\/en\/wp-json\/wp\/v2\/product_tag?post=3513"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}