Abstract

The paper considers fluid convection in low temperature grinding. Fluid cooling often predominates over all other forms of heat dispersion in the grinding zone particularly in low temperature grinding. Experimental values of convection heat transfer coefficient (CHTC) up to and in excess of 200,000 W/m2K have been found by various researchers both for water-based emulsions and in one case for mineral oils employed in high wheel-speed grinding. Several convection models have been developed in recent years for prediction of CHTCs in low temperature grinding. This paper reviews advances in convection modelling and reconsiders the basic assumptions implied. A proposal is made for improved estimation for highly churned flow assuming a degree of fluid warming. Predicted coefficients are compared with measured values.

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