A 1 μm Aluminum Particle Heated 4.6× Slower Than the Continuum Formula — Sherman Interpolation in the Knudsen Transition Regime
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At 1500 K and 1 atm a 1 μm aluminum particle sits at Kn = 0.67. Nu = 2 shortens heat-up by 4.58; Sherman's harmonic mean puts that time back.