Induction heating of graphite rod to incandescence.
00:59
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3 years ago
A small graphite rod is heated with an induction heater. The rod is inside the induction coil, sitting on a fire brick. The induction coil is a copper tube. Cooling water is forced through the tube, high frequency, high current electricity is flowing through the copper wall of the tube. This electrical current induces eddy currents in the graphite rod, which heats it up internally. There is not any contact between the copper tube and the graphite rod.
At the start of the video, surface oils and binders in the graphite rod burn out, causing smoke.
Since the graphite rod does not melt, its temperature gets very high, and it glows a bright white. The camera irises down, so the rest of the room appears to go dark. At one point I tilt the camera to include the outside window, which opens the camera's iris back up, and you can then see the intense brightness. This was way too bright to observe with the naked eye.
Kodak EasyShare V530, 640x480 @ 15fpsA small graphite rod is heated with an induction heater. The rod is inside the induction coil, sitting on a fire brick. The induction coil ...all »A small graphite rod is heated with an induction heater. The rod is inside the induction coil, sitting on a fire brick. The induction coil is a copper tube. Cooling water is forced through the tube, high frequency, high current electricity is flowing through the copper wall of the tube. This electrical current induces eddy currents in the graphite rod, which heats it up internally. There is not any contact between the copper tube and the graphite rod.
At the start of the video, surface oils and binders in the graphite rod burn out, causing smoke.
Since the graphite rod does not melt, its temperature gets very high, and it glows a bright white. The camera irises down, so the rest of the room appears to go dark. At one point I tilt the camera to include the outside window, which opens the camera's iris back up, and you can then see the intense brightness. This was way too bright to observe with the naked eye.
Kodak EasyShare V530, 640x480 @ 15fps«
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