Sterpu, Ancaelena Eliza; Teodorescu, Nicoleta; Prodea, Iuliana Marlena; Popescu, Eugeniu; Niţă, Irina
August 2010
Environmental Engineering & Management Journal (EEMJ);Aug2010, Vol. 9 Issue 8, p1063
Academic Journal
The aim of this study was to find a mathematical model for the mixing of some additive-free calcium soap lubricating greases. The base-oil is mineral paraffinic oil, known for its biodegradability and the calcium soap is less toxic than other metallic soaps, so the resulted greases are considered more environmentally friendly. The mathematical modeling focused on finding an accurate equation linking the Power number (Np) and the Reynolds number (Re) at various soap concentrations and temperatures. The rheological curves indicate that the greases have non-Newtonian behaviors which are better described by the Ostwald de Waele model (power law model). The mixing experiments were carried out in a laboratory autoclave equipped with an anchor impeller, without baffles, at 8 speed ratio, from 100 to 800 rpm. The models resulted from the Np variation versus Re are power function type Np = a â‹… Reb, where the coefficients a and b are linear functions of soap concentration in base oil and the processing temperature.


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