微极流体润滑条件下能量方程的推导及应用

为考察微极流体的热流体动力润滑特性,根据微极流体的基本理论和能量守恒与转换定律,推导了微极流体的能量方程;依据其润滑条件假设,得出了润滑条件下微极流体的能量方程的简化形式.以有限长滑动轴承为例,将所推导的能量方程与微极流体的雷诺方程和轴瓦热传导方程联立进行数值求解,得到油膜及轴瓦的温度分布.结果表明:采用微极性流体润滑,其油膜及轴瓦的温度均比采用牛顿流体有所升高,流体的微极性越强,温度升高越明显.

Derivation and Application of Energy Equation for the Lubrication with Micropolar Fluids

To investigate the characteristics of thermo-hydrodynamic lubrication with micropolar fluids, the energy equation for micropolar fluids is derived, based on the theory of micropolar fluids and the laws of conservation and conversion of energy. Then the simplified energy equation is obtained under the hypothesis of lubrication conditions. A typical example is taken for a finite journal bearing, and the derived energy equation is solved numerically together with the Reynolds equation for micropolar fluids and the heat transfer equation in the bushing. The temperature field distribution of oil film and bushing are then calculated. It is shown, when compared with the Newtonian fluids, that micropolar fluids produce higher temperatures both in the oil film and in the bushing, and that the more micropolarity in the fluids, the higher will be the temperature.