Difference between revisions of "Accidental heatpump"
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Latest revision as of 22:23, 4 July 2024
Or accidental heatmump dissipation mechanism.
- A potential dissipation mechanism that is linear proportional to speed.
- An entropic effect.
This occurs when thin walled structures A that can wobble around due to thermal excitations
get constraint in their wobbling amplitudes due other stiff structures B moving such
that they start blocking these thermal wobbles of the thin structures A.
Blocked wobbles mean fewer degrees of freedom. Energy is preserved thus
one gets more energy in fewer degrees of freedom (exceeding the equipartitioning theorem as fist approximation).
And this then equates to a locally elevated temperature that quickly and irreversibly dissipates.
The same in reverse when thin walled structures A get released to wobble more again.
Less energy in more degrees of freedom.
This equates to a locally reduced temperature that quickly and irreversibly dissipates.
Generally dissipation is quick due to large surface to volume ratio at the nanoscale
and (to lesser degree) due to the superb heat conductivity of diamond as likely building material.
Physics - More concrete geometry example
– Shifting a thick stiff plunger-shaft in a tight thin walled sleeve
the sleeves walls can't wobble around so much anymore and thus
thermal motion degrees of freedom get "squeezed out" and things get hot.
Reversible computing analogy: This basically equates to setting a random bit to a known state (pushed outwards).
Push spacial entropy in the system out into thermal entropy out of the system.
– Pulling a thick stiff plunger-shaft out of the sleeve
thermal motion degrees of freedom get opened up again and
suck in heat from the environment, making things get cold.
Reversible computing analogy: This basically equates to deleting a known bit (pushed outwards) by rando data from thermal noise.
Fill spacial order with entropy into the system tapping it from thermal entropy of the environment.
If the thermal energy gradient is not immediately recuperated
(nigh impossible due to: high at the nanoscale surface to volume ratio & high heat conductivity of diamond)
that energy is immediately dissipated and made permanently unrecoverable.
Possible counter-strategies:
– stiffer sleeves
– less tight fitting sleeves
– picking geometries that do not block or open up thermal motion amplitudes as much
