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Rifles, Reloading, Optics, Equipment
Reloading
Who is annealing in sand?
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<blockquote data-quote="Mikecr" data-source="post: 1823836" data-attributes="member: 1521"><p>There is nothing <em>wrong</em> with melted salt, so you have a safety net to fall back on. </p><p>And I applaud your efforts to continue process development, but much of this can be eliminated with logic.</p><p>Thermal conductance of dry sand is pretty low. You're heating that in contact with the bottom and sides, and there is heat rising in the voids, but it's going to transfer poorly across the body. Right?</p><p>So it would take a long time for sand in the middle to match sand along hot edges.</p><p>Then as each granule of sand gives up heat to brass in contact, that granule will not quickly replenish lost heat from adjacent granules, so the brass will serve to quench the contact sand, dropping it's temperature.</p><p>Then,, the sand contact with dipped brass is also less than 100%, whereas a liquid like melted salt or lead is in full contact. </p><p></p><p>Liquids are usually higher in thermal conductance, and wet sand is more thermally conductive than dry sand.</p><p>What liquid rests at ~850degF?</p></blockquote><p></p>
[QUOTE="Mikecr, post: 1823836, member: 1521"] There is nothing [I]wrong[/I] with melted salt, so you have a safety net to fall back on. And I applaud your efforts to continue process development, but much of this can be eliminated with logic. Thermal conductance of dry sand is pretty low. You're heating that in contact with the bottom and sides, and there is heat rising in the voids, but it's going to transfer poorly across the body. Right? So it would take a long time for sand in the middle to match sand along hot edges. Then as each granule of sand gives up heat to brass in contact, that granule will not quickly replenish lost heat from adjacent granules, so the brass will serve to quench the contact sand, dropping it's temperature. Then,, the sand contact with dipped brass is also less than 100%, whereas a liquid like melted salt or lead is in full contact. Liquids are usually higher in thermal conductance, and wet sand is more thermally conductive than dry sand. What liquid rests at ~850degF? [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Who is annealing in sand?
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