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EXPERIMENTAL ANALYSIS OF REFRIGERANT MIXING IN LUBRICANT OIL

机译：润滑油中制冷剂混合的实验分析

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摘要

Refrigerant absorption and mixing in lubricant oil are important in compressor and system design.Experimental work is reported on absorption of refrigerant vapour through the top interface of an initially stagnant layer of pure lubricant oil.Depending on the refrigerant-oil pair,the liquid refrigerant is heavier than the oil and mixing is enhanced due to natural mass convection.This behavior is typical of HFC refrigerants,such as R-134a.In contrast,in systems where the liquid refrigerant is less dense than the oil(for example,HC refrigerants,like R- 600a and R-290)liquid density instability near the interface does not occur and absorption takes place by molecular diffusion alone. rnA test rig consisting of a transparent test section through which absorption is observed was specially constructed for the present experiments.During each experimental run,the overall mass of refrigerant in the test section was kept constant and,as a result,the pressure decreased with time.Tests were conducted for R-134a and R-600a with three POE oils of distinct viscosity grades and the effect of the initial depth of the oil layer(aspect ratio)on the velocity field and on the refrigerant absorption rate(i.e.,pressure change rate)was assessed.
机译：润滑油中制冷剂的吸收和混合在压缩机和系统设计中很重要。据报道，实验工作是通过最初停滞的纯润滑油层的顶部界面吸收制冷剂蒸汽。比自然油更重，并且由于自然对流而增强了混合效果。此行为是HFC制冷剂（例如R-134a）的典型现象。相比之下，在液体制冷剂密度不如石油的系统中（例如HC制冷剂，例如R-600a和R-290），不会在界面附近发生液体密度不稳定性，并且吸收仅通过分子扩散发生。 rn本实验专门建造了一个由透明测试部分组成的测试装置，通过该测试部分可以观察到吸收。在每次实验过程中，测试部分中的制冷剂总质量保持恒定，结果压力随时间降低使用三种粘度等级不同的POE油对R-134a和R-600a进行了测试，并且油层的初始深度（长宽比）对速度场和制冷剂吸收率（即压力变化）的影响率）。

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  • 来源
    《Compressors 2006》|2006年|p.1-7|共7页
  • 会议地点 Casta Papiernicka(SK);Casta Papiernicka(SK)
  • 作者

    ORTOLAN Murilo; BARBOSA Jr. Jader;

  • 作者单位

    Department of Mechanical Engineering,Federal University of Santa Catarina,Brazil,murilo@polo.ufsc.br;

    Department of Mechanical Engineering,Federal University of Santa Catarina,Brazil,jrb@polo.ufsc.br;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 压缩机;
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