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Title: Oil Contamination In A Herschel Venturi
Author: Stanley P. Schumann, Gary Bramos,Taft Snowden
Source: 1990 International Symposium on Fluid Flow Measurement
Year Published: 1990
Abstract: Performance measurements in gas compressors pose unique problems. Under normal operating conditions, refrigeration compressors circulate small amounts of lubricating oil with the refrigerant gas. We designed an experiment to attempt to quantify the impact of small amounts of oil, below 5% by weight, on a Herschel subsonic venturi. A critical flow nozzle metered air at 2.06 MPa (3 00 psia) through the test venturi at a known flow rate. An upstream metering pump injected oil into the flow stream. For an experimental run we established clean flow, recorded data for clean flow and while collecting data the oil injection began and the dirty flow recorded. At the conclusion of the test we stopped oil injection and allowed clean flow to again stabilize while collecting data. A plot of the dirty to clean flow ratio as the ordinate with mass percentage of oil as the abscissa, Appendix 1, shows the relationship we found. We tried adapting Murdocks (1) method for two-phase flow determination for orifices but found our results to be many times greater than expected. We also tried to explain the difference using an area blockage technique, but results were no better.

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