Despite the importance of the starvation in the elastohydrodynamic lubrication, only a few numbers of studies have been devoted to this topic, especially within the context of the mixed EHL. In the present study, the numerical approach conducted by the authors that includes the effect of surface roughness in line-contact [12] and point-contact EHL [13] is extended to take lubricant starvation into account. As mentioned earlier, the degree of starvation can be stated in terms of the inlet distance for both point contact [2] and line contact [6] and [14]. However, this definition does not convey a physical understanding of the phenomenon. For point-contact EHL, the starvation can be described in terms of the thickness of the oil layer at the inlet [3], [4] and [5]. However, this method does not seem to be suitable for line contact because of the assumption of infinite contact width (see Ref. [14]). In the current study, the starvation is treated in terms of the reduction in the mass flow rate as defined in Ref. [7]. This definition has the advantage of being applicable to both the line-contact and point-contact EHL as well as conveying the physical meaning of the phenomenon. Using this definition, the influence of the starvation on the pressure distributions and film profiles is investigated in the mixed EHL regime. Subsequently, by performing regression analyses based on the results of a wide range of simulations, appropriate formulas are presented (for both line contact and point contact) to predict the asperity load ratio as well as the reduction in the central and minimum film thickness in the starved mixed EHL regime.
Despite the importance of the starvation in the elastohydrodynamic lubrication, only a few numbers of studies have been devoted to this topic, especially within the context of the mixed EHL. In the present study, the numerical approach conducted by the authors that includes the effect of surface roughness in line-contact [12] and point-contact EHL [13] is extended to take lubricant starvation into account. As mentioned earlier, the degree of starvation can be stated in terms of the inlet distance for both point contact [2] and line contact [6] and [14]. However, this definition does not convey a physical understanding of the phenomenon. For point-contact EHL, the starvation can be described in terms of the thickness of the oil layer at the inlet [3], [4] and [5]. However, this method does not seem to be suitable for line contact because of the assumption of infinite contact width (see Ref. [14]). In the current study, the starvation is treated in terms of the reduction in the mass flow rate as defined in Ref. [7]. This definition has the advantage of being applicable to both the line-contact and point-contact EHL as well as conveying the physical meaning of the phenomenon. Using this definition, the influence of the starvation on the pressure distributions and film profiles is investigated in the mixed EHL regime. Subsequently, by performing regression analyses based on the results of a wide range of simulations, appropriate formulas are presented (for both line contact and point contact) to predict the asperity load ratio as well as the reduction in the central and minimum film thickness in the starved mixed EHL regime.
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