Heat Transfer on Grinding Workpiece Surface Subjected to Mist/Air Impinging Jet.

Investigation is carried out to illustrate some of the flow and heat transfer characteristics that occur when a single-air jet or mist/air jet impinges on a flat plate with a rotating disk mounted above the surface, the representative of the workpiece in a grinding process. The first objective aims to assess the detailed flow and heat transfer features in the vicinity of a rotating grinding wheel with jet impingement directed at grinding zone by numerical investigation. The second objective aims to assess the quantitative evaluation for heat transfer enhancement on a grinding workpiece surface subjected to the mist/air jet impingement by experimental investigation. The results show that the coupled action of swirl air entrainment and jet impingement is benefit for convective heat transfer enhancement near grinding region when the jet impinging direction is consistent with the rotating direction of rotating disk, especially at higher rotating speed. Furthermore, the increasing of water droplet in mist cooling can enhance the cooling effect significantly. [ABSTRACT FROM AUTHOR]