Theoretical investigation of porous hydrostatic journal bearing under micropolar fluid lubrication

Abstract

The features of micropolar fluid (a non-Newtonian fluid)–lubricated short single-layered porous hydrostatic journal bearing are analyzed theoretically by an iterative method. To investigate hydrostatic journal bearing characteristics, a modified Reynolds equation in the case of micropolar fluid is derived and solved numerically. The obtained results in this work are validated by comparing the same with previously published results with Newtonian and non-Newtonian lubricants in the form of design charts. The static stiffness and load-carrying capacity of the investigated bearing are 80% and 75% higher than conventional hydrostatic bearings. The porous hydrostatic journal bearing exhibits more economical performance as it requires 40% low flow rate and low pump power, and it generates 50% less heat in contrast with other hydrostatic bearings.

Nano-fluid lubrication of single-layered porous hydrostatic bearing: a theoretical approach

“…Figure 2 illustrates the change in the coefficient of stiffness with the bearing number and additionally, it also shows a comparison of present outcomes with the consequences of Ref. [11]. The components (K xx and K yy ) of the stiffness coefficient of the current examination are improved as contrasted with the same of micropolar fluid [11].…”

“…In this section, the advantage of utilizing nano-lube oil over micropolar oil has been talked about extravagantly. For the purpose of valid approval of established results, Shenoy et al [10] and Bhattacharjee et al [11] are surveying the findings of the existing analysis similar to those obtained. The design graphs and tables demonstrated that the present hypothetical examinations are in acceptable understanding (Table 1).…”

“…1. The scientific explanation of such a bearing framework requires a few suspicions [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]26] of the porous layer and hydrodynamic nano-oil film. These are given underneath.…”

“…The non-dimensional film thickness h b inside the singlelayered PHB is the function of b (from the geometry of Fig. 1) which is given by [11]:…”

“…The permeable (porous) bearing is one of the subjects of research enthusiasm among them. As of late, Bhattacharjee et al [11] researched the working attributes of both single and two-layered PJB (porous journal bearing) under the micropolar fluid lubrication. The micropolar oil or liquid is a sort of non-Newtonian liquid comprising of conventional lube oil and small-scale particles (size of 1-1000 μm) as added substance.…”