Does convection ALWAYS work more qucikly than conduction?
Does convection always occur more quickly than conduction? Please explain your reasoning.
1 Answers
Not necessarily. It depends on the situation, and what situations exactly you are comparing.
If you have a wall gap filled with air, free to circulate, and a neighboring wall with the gap filled with solid copper, the solid copper wall will be better at heat transfer, even though it is pure conduction through the solid copper.
The only situation you can definitely compare is on a common substance basis. For instance, suppose you have a chamber filled with air and a loosely packed set of fibers preventing convective circulation, and it is compared to an otherwise identical chamber filled with nothing besides air. The convective effects in the emptier chamber will enhance the pure conductive effects which would exist without circulation. This is because the bulk motion of the fluid flow carries heat faster than molecular collisions alone with no bulk motion. You need to compare on a "common flavor, common phase of matter" basis to make this definite comparison.
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