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demonstrations:4_thermodynamics:4f_entropy_and_the_second_law:heat_engine_on_a_wire:start
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demonstrations:4_thermodynamics:4f_entropy_and_the_second_law:heat_engine_on_a_wire:start [2019/02/14 23:33] 127.0.0.1 external edit |
demonstrations:4_thermodynamics:4f_entropy_and_the_second_law:heat_engine_on_a_wire:start [2019/04/24 23:18] (current) demoroom |
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| ====== Heat Engine On A Wire ====== | ====== Heat Engine On A Wire ====== | ||
| - | {{tag> needs_review untagged unlocated}} | + | {{tag> thermodynamics heat_engine bimetallic repair unlocated}} |
| <WRAP box right> | <WRAP box right> | ||
| Line 11: | Line 11: | ||
| ===== Description ===== | ===== Description ===== | ||
| - | Heat to Kinetic Energy transfer. Classes Used: PHYS 153 | + | Consists of a pair of aluminum supports with holes in the center, a steel wire, and a number of small bimetallic disks. |
| - | + | ||
| - | + | ||
| - | change of energy type, expansion | + | |
| - | + | ||
| - | Updated on: 06/19/13 | + | |
| + | **Very finicky. Currently not in working order.** | ||
| + | (You can try, but after a number of attempts the disk would not reliably jump from side to side.) | ||
| ===== Purpose ===== | ===== Purpose ===== | ||
| - | + | To demonstrate how the differing coefficients of thermal expansion in metals may be utilized. Shows a very unusual example of a heat engine. | |
| - | To demonstrate differing expansion of metals as utilized in bi-metal applications. An example of a transfer of heat energy to kinetic energy. | + | |
| - | + | ||
| ===== Apparatus ===== | ===== Apparatus ===== | ||
| - | + | * Wire, aluminum supports, and bimetallic disks | |
| - | Wire, supports and metal disk, hotplate | + | * [[demonstrations:9_equipment:hot_plate:start|Hot plate]] |
| - | + | ||
| ===== Setup ===== | ===== Setup ===== | ||
| + | Start by setting up the heat engine. Insert the wire into both of the aluminum supports, threading it through the hole in one of the bi-metallic disks at the same time. Place one of the aluminum supports onto a hotplate and turn it on to the maximum setting. | ||
| - | Place bi-metal disk with concave (brass coloured) side down on the support that rests on the hot-plate. Disk will heat up and flip along the wire to the cold support where it cools and flips back again. | + | Place bi-metallic disk with concave (brass coloured) side down on the support that rests on the hot-plate. Once the disk has heated up to some critical value, it'll buckle (go from concave-side-down to convex-side-down), propelling it along the wire to the other support. Once it cools down, it'll return to it's original form, flipping over to the hot side once again. |
| - | + | ||
| ===== Notes ===== | ===== Notes ===== | ||
| + | It may be necessary to elevate one of the sides, should it turn out that the disk can't jump high enough from that side to reach the other. | ||
| <WRAP group> | <WRAP group> | ||
demonstrations/4_thermodynamics/4f_entropy_and_the_second_law/heat_engine_on_a_wire/start.1550187203.txt.gz · Last modified: 2019/02/14 23:33 by 127.0.0.1
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