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Abstract
The flow of granules has been proposed as a mechanism of lubrication suitable for high-temperature applications. This study is primarily experimental with a simplified theory presented for interpreting the data. Experiments are conducted in an annular shear cell at very high concentration where the major force contribution is due to particle collisions. Normal and shear stress as a function of solids fraction with different drive surface roughness and particle size are studied. The experimental data show that the stresses increase and friction coefficients decrease with increasing solids fraction. A rough drive surface tends to increase the magnitude of the stresses compared with its smooth counterpart. Large particles carry more stress than small ones, and the existence of the lubrication wedge effect caused by three sloping regions is confirmed. Theoretical predictions are compared with experimental results for the case of flat surfaces and reasonable agreement is found.
Presented as a Society of Tribologists and Lubrication Engineers paper at the STLE/ASME Tribology Conference in Kissimmee, Florida, October 8–11, 1995
Notes
Presented as a Society of Tribologists and Lubrication Engineers paper at the STLE/ASME Tribology Conference in Kissimmee, Florida, October 8–11, 1995
