Empirical correlation for ejector design

In the present study, two empirical correlations from the test results of 1 5 ejectors are derived for the performance prediction of ejectors using R14 1b as the working fluid. The ratio of the hypothetical throat area of the e ntrained flow to the nozzle throat area A(e)/A(t), the geometric design par ameter of the ejector A(3)/A(t), and the pressure ratios P-g/P-e and P-c*/P -e are used to correlate the performance of the ejector. The prediction of the entrainment ratio omega using the correlations is within +/- 10% error. A method of calculation for the ejector design using the correlations is a lso developed. R141b is shown in the present study to be a good working flu id for an ejector. The measured omega for the ejectors used in the present study can reach as high as 0.54 at P-g = 0.465 MPa (84 degrees C), P-c* = 0 .087 MPa (28 degrees C) and P-e = 0.040 MPa (8 degrees C). For P-g = 0.538 MPa (90 degrees C), P-c* = 0.101 MPa (32 degrees C) and P-e = 0.040 MPa (8 degrees C), omega reaches 0.45. (C) 1999 Elsevier Science Ltd and IIR. All rights reserved.