= Potter-Elvehjem homogenizer
{c}
A <Potter-Elvehjem homogenizer> disrupts <biological tissue> between a fitted pestle and a surrounding vessel, often using a rotating drive. <Flow> and mechanical <deformation> in the small clearance transfer <energy> from the drive into the sample. <WHEATON Safe-Grind Potter-Elvehjem Tissue Grinder by DWK Life Sciences>[DWK Life Sciences, Potter-Elvehjem grinder: vessel, pestle and powered operation]{ref}
For an idealized narrow gap containing a <Newtonian fluid>, the <shear rate> scale is $U/\delta$, with relative surface speed $U$ and clearance $\delta$; <viscous stress> scales as $\eta U/\delta$. Actual tissue is more complex, but the relation explains why clearance, motion and <dynamic viscosity> affect disruption.
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