Building a convection model for plate tectonics and ocean currents Answered
I'm building a model to show our museum visitors how convection works related to plate tectonics. (It can also be used for ocean currents.) I'm stuck on the heating source, though, because we cannot have open flames.
The model is a cell of water, about 0.5" wide X 10" long X up to 8" high (depending on water depth).
I would to implement some type of circuit with a resistor that produces heat at the bottom, and inside the cell, and battery powered. At the top at either end would be ice cubes, to cool the water so it falls back down and recirculates. To see the currents, the ice cubes have blue food coloring, and I use a long pipette to inject coloring at the bottom near our current heat source, and mug of hot water.
I'm having trouble finding information on:
- what type of resistor (how many ohms?, anything specialized for being submerged?)
- how large a battery/ies for a 4-hour day on the floor (rechargeable, of course)
- other steps to prevent corrosion
It will need an on/off switch and a battery connector, too, of course...
I'm sure I may be missing some other important things to consider, too.
Any feedback would be great.