In any grinding operation heat flows periodically into the abrasive grains in the surface of the wheel during wheel-work contact and is extracted during the remaining portion of a single revolution of the wheel. If it can be assumed that all of the heat flowing inward is extracted outward during the cooling portion of a single wheel revolution, then the thermal partition coefficient  
R=heattowork/totalgrindingenergy
may be readily estimated. This paper discusses conditions under which this assumption represents an acceptable approximation.
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