External flow

Last updated

In fluid mechanics, external flow is a flow that boundary layers develop freely, without constraints imposed by adjacent surfaces. [1] [2] It can be defined as the flow of a fluid around a body that is completely submerged in it. Examples include fluid motion over a flat plate (inclined or parallel to the free stream velocity) and flow over curved surfaces such as a sphere, cylinder, airfoil, or turbine blade, water flowing around submarines, and air flowing around a truck; [3] a 2000 paper analyzing the latter used computational fluid dynamics to model the three-dimensional flow structure and pressure distribution on the external surface of the truck. [3] In a 2008 paper, external flow was said to be "arguably is the most common and best studied case in soft matter systems. [4]

The term can also be used simply to describe flow in any body of fluid external to the system under consideration. [5] [6]

In external co-flow, fluid in the external region occurs in the same direction as flow within the system of interest; this contrasts with external counterflow. [1]

References

  1. 1 2 Jendoubi, S.; Strykowski, P. J. (September 1, 1994). "Absolute and convective instability of axisymmetric jets with external flow". Physics of Fluids. 6 (9): 3000–3009. Bibcode:1994PhFl....6.3000J. doi:10.1063/1.868126.
  2. ↑ Lebedev, V. V.; Turitsyn, K. S.; Vergeles, S. S. (November 20, 2007). "Dynamics of nearly spherical vesicles in an external flow". Physical Review Letters. 99 (21) 218101. arXiv: cond-mat/0702650 . Bibcode:2007PhRvL..99u8101L. doi:10.1103/PhysRevLett.99.218101. PMID   18233260. S2CID   17517230.
  3. 1 2 Roy, Subrata; Srinivasan, Pradeep (2000). "External Flow Analysis of a Truck for Drag Reduction". SAE Transactions. 109: 808–812. JSTOR   44650820.
  4. ↑ Speck, Thomas; Mehl, Jakob; Seifert, Udo (April 28, 2008). "Role of External Flow and Frame Invariance in Stochastic Thermodynamics". Physical Review Letters. 100 (17) 178302. arXiv: 0712.0232 . Bibcode:2008PhRvL.100q8302S. doi:10.1103/PhysRevLett.100.178302. PMID   18518344. S2CID   2743850.
  5. ↑ Chiu, Y-H.; Etheridge, D. W. (April 1, 2007). "External flow effects on the discharge coefficients of two types of ventilation opening". Journal of Wind Engineering and Industrial Aerodynamics. 95 (4): 225–252. Bibcode:2007JWEIA..95..225C. doi:10.1016/j.jweia.2006.06.013.
  6. ↑ Chew, J. W.; Green, T.; Turner, A. B. (February 18, 2015). "Rim Sealing of Rotor-Stator Wheelspaces in the Presence of External Flow". Turbo Expo: Power for Land, Sea, and Air. American Society of Mechanical Engineers. doi:10.1115/94-GT-126. ISBN   978-0-7918-7883-5. S2CID   110218328.
This page is based on this Wikipedia article
Text is available under the CC BY-SA 4.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.