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首页> 外文会议>HTD-vol.376-2; ASME(American Society of Mechanical Engineers) International Mechanical Engineering Congress and Exposition; 20051105-11; Orlando,FL(US) >HEAT TRANSFER CHARACTERISTICS IN MIST COOLING WITH MACHINING OIL
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HEAT TRANSFER CHARACTERISTICS IN MIST COOLING WITH MACHINING OIL

机译：机加工油雾冷却中的传热特性

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摘要

Heat transfer characteristics in mist cooling with commercial machining oil were investigated experimentally. Steady state experiments of heat transfer were conducted using a pure copper cylinder and mist flow of commercial machining oil and air. Liquid flow rate was 0.3, 0.9, 1.8, 4 and 8 l/hr, respectively; each air flow rate was 0, 40, 75 and 120 l_N/min. Furthermore, liquid mass flux on the heating surface for each experimental condition was measured by using a measuring cylinder with same diameter as the heater. Average velocity of droplets and average diameter of those were measured by using a laser doppler anemometer and immersion method, respectively. The heat transfer mechanism in oil mist was only cooling of liquid film formed on a heated surface, whereas the heat transfer mechanism in water mist cooling was classified into three regions. The heat transfer coefficient in the oil mist was well expressed by the heat removal capacity on sensible heat of supplying oil-droplets to the heated surface. Four dimensionless correlations were derived from a dimension analysis, Buckingham Pi theorem, and experimental data for both water mist and the oil mist.
机译：实验研究了工业机油雾冷却中的传热特性。使用纯铜圆筒和工业加工的油和空气的雾流进行了稳态传热实验。液体流速分别为0.3、0.9、1.8、4和8l / hr；每个空气流速为0、40、75和120 lN / min。此外，通过使用具有与加热器相同直径的量筒来测量每种实验条件在加热表面上的液体质量通量。分别使用激光多普勒风速计和浸没法测量液滴的平均速度和平均直径。油雾中的传热机制仅是冷却形成在加热表面上的液膜，而水雾中的传热机制则分为三个区域。油雾中的传热系数很好地表示为将油滴供应到受热表面的显热的除热能力。从尺寸分析，白金汉Pi定理和水雾和油雾的实验数据中得出了四个无量纲相关性。

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