A Theoretical Study of Fluid Dynamic Energy Separation
GEORGE WASHINGTON UNIV WASHINGTON DC SCHOOL OF ENGINEERING AND APPLIED SCIENCE
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Three classes of energy separation techniques are analyzed and compared steady flow, employed by the Ranque-Hilsch vortex tube RHT nonsteady flow, used by the dynamic pressure exchanger divider DPE and cryptosteady flow, used in the Foa energy separator FES. The RHT is analyzed first to establish upper bound performance curves which are then compared with the best known experimental data these exhibit performance generally in the range of one-half to two-thirds of theoretical. The discussion of the DPE is based on experimental data presented in the literature. The data reveal excellent low pressure ratio performance. However, cold fraction for maximum temperature drop decreases rapidly with increasing pressure ratio. The FES is analyzed to provide equations defining the dependence of performance on salient design and operational parameters. Additionally, several output flow collection effects are identified and analyzed. Comparison of the three devices indicates that the FES substantially outperforms tHE RHT at all pressure ratios and the DPE at all but the lowest pressure ratios.
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