磨削液传统上被用作在砂轮-工件界面提供冷却和润滑的外部手段。如果以高于砂轮圆周速度的速度供应磨削液，可以提高磨削液性能的有效性，从而克服砂轮的离心力并穿透周围的空气包层。体积流率也应足够高，以便在研磨区提供有效的对流冷却/润滑。

GRINDING FLUIDS HAVE TRADITIONALLY BEEN USED AS AN EXTERNAL MEANS TO PROVIDE COOLING AND LUBRICATION AT THE- WHEEL-WORKPIECE INTERFACE. THE EFFECTIVENESS OF GRINDING FLUID PERFORMANCE CAN BE INCREASED IF IT IS SUPPLIED AT A SPEED HIGHER THAN THE PERIPHERAL VELOCITY OF THE WHEEL SO IT CAN OVERCOME THE CENTRIFUGAL FORCE OF THE WHEEL AND PENETRATE THE SURROUNDING AIR ENVELOPE. THE VOLUME FLOW RATE ALSO SHOULD BE HIGH ENOUGH TO PROVIDE EFFECTIVE CONVECTIVE COOLING/LUBRICATION AT THE GRINDING ZONE.