| タイトル | Aeroacoustic and aerodynamic applications of the theory of nonequilibrium thermodynamics |
| 本文（外部サイト） | http://hdl.handle.net/2060/19910016038 |
| 著者（英） | Smith, Charles A.; Horne, W. Clifton; Karamcheti, Krishnamurty |
| 著者所属（英） | NASA Ames Research Center |
| 発行日 | 1991-06-01 |
| 言語 | eng |
| 内容記述 | Recent developments in the field of nonequilibrium thermodynamics associated with viscous flows are examined and related to developments to the understanding of specific phenomena in aerodynamics and aeroacoustics. A key element of the nonequilibrium theory is the principle of minimum entropy production rate for steady dissipative processes near equilibrium, and variational calculus is used to apply this principle to several examples of viscous flow. A review of nonequilibrium thermodynamics and its role in fluid motion are presented. Several formulations are presented of the local entropy production rate and the local energy dissipation rate, two quantities that are of central importance to the theory. These expressions and the principle of minimum entropy production rate for steady viscous flows are used to identify parallel-wall channel flow and irrotational flow as having minimally dissipative velocity distributions. Features of irrotational, steady, viscous flow near an airfoil, such as the effect of trailing-edge radius on circulation, are also found to be compatible with the minimum principle. Finally, the minimum principle is used to interpret the stability of infinitesimal and finite amplitude disturbances in an initially laminar, parallel shear flow, with results that are consistent with experiment and linearized hydrodynamic stability theory. These results suggest that a thermodynamic approach may be useful in unifying the understanding of many diverse phenomena in aerodynamics and aeroacoustics. |
| NASA分類 | FLUID MECHANICS AND HEAT TRANSFER |
| レポートNO | 91N25352
A-90084
NAS 1.60:3118
NASA-TP-3118 |
| 権利 | No Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/132095 |
