鐵磁性流體潤滑之矩形平板溫度效應分析

Temperature Effect to the Performance of Rectangular Plate Lubricater with Magnetic Ferrofluids

10.6989/JN.201112.0105

周祖亮(Tsu-Liang Chou)；馮騰榔(Teng-Lan Feng)；江新祿(Hsiu-Lu Chiang)

鐵磁性流體 ； 擠壓薄膜 ； 赫特曼數 ； ferrofluid ； squeeze film ； Hartmann number

南亞學報

31期（2011 / 12 / 01）

105 - 119

繁體中文

潤滑液之黏度對軸承壓力及負載容量之影響甚大，是分析軸承性能之重要參數。影響黏度之主要因素為油膜之溫度。本文使用之潤滑液為不可壓縮之電導流體，在外加磁場之作用下，探討矩形平板軸承之擠壓性能。潤滑液之黏度視為油膜溫度T之函數，亦即黏度函數採用μ=μ₀exp(-γT)，其中γ為溫度敏感度係數。分析結果顯示，增加平板軸承之長寬比β、赫特曼數M0會增加無因次油膜壓力p*、負載容量W*，並進一步增加反應時間t*，提高軸承性能。至於增加溫度敏感度係數γ或平均膜溫T，則會降低油膜壓力p*及負載容量W*，並減少反應時間t*，降低軸承性能。

Lubricant viscosity is high crucial influence for the squeeze film pressure and load-carring capacity. Therefore, it becomes the important parameter in analysis of bearing performance study. The temperature is primary dominant factor to the variation of lubricant viscosity. In this research, we prove the characteristic of viscosity of uncompressible lubricant under plate lubricated with ferrofluid as viscosity varied with temperature. And viscosity (μ=μ₀exp (-γT)), γ is thermal co efficiency.The analytical result show that rise length with width, aspect ratio (β), and Hartmann number (Mo), will increase dimensionless squeeze film pressure (p*) and load-carrying capacity (W*). Furthermore, the longer response time (t*) can promote loading of the bearing. However, the larger γ or average temperature T of the lubricant film, the smaller squeeze film pressure (p*), and load-carrying capacity (W*). But, shorter response time t* will degrade the ability of bearing performance.