The momentum of approximately 0 resulted as the "very oily" and no flashing was observed in the experiment. The good de-oiling conditions were observed at the higher average two-phase temperature and higher average momentum.

　

Fig.9 Pressure and quality in rivet bed at 6.2 mm rivet layer

Fig.10 Average temperature and momentum in rivet bed at 6.2 mm rivet layer

Fig.11 De-oiling condition map at hot water rate 0.22 - 0.24 l/min

　

Conclusion

　

1. The low-pressure flashing flow was applied to the packed bed of oily machine parts and de-oiling was successfully conducted. The de-oiling was done without the oil vaporization.

2. The analytical method was proposed to predict the low-pressure flashing flow in non-spherical particle bet. According to the analytical results, the successful de-oiling was obtained at the higher temperature and momentum of flashing two-phase flow.

　

References

　

1. Osakabe, M., Ka, K., Haze, I., Ito, T., Amano, T., Proceeding of Multi phase flow symposium, (1997), 203

2. E. A. Foumeny et al., Correlation of pressure drop in packed beds taking into account the effect of confining wall, Int. J. Heat Mass Transfer. 36(2), (1993), 536

3. E. Achenbach, Heat transfer and pressure drop of pebble beds up to high Reynolds number, Proc. of 7th Int. Heat Transfer Conference., vol.6, (1982), 1

4. Osakabe, M., Ka, K., Haze, I., Ito, T., Characteristics of steam flow in non- spherical particle bed, Journal of M.E.S.J., 33(4), (1998), 294

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