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Technical Notes Volume 2-13

Technical Notes Volume 2-13


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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1920 Excerpt: ...the circulation along a closed contour moving in a fluid remains constant. Now, if a closed contour surrounding a wing leaves it by slipping along the wing itself, the circulation along this contour, which had a certain value so long as the contour surrounded the wing, must be nullified; therefore this contour must cut VORTEX LINES. The existence of vortexes in a NON-VISCOUS fluid seems to bo in contradiction with the laws of Lagrange and Helmholtz. But, as the author has shown in a work on "Flow of Fluids in the Case of a very slight Friction," we must consider the problem of the flow of NON-VISCOUS fluids along solid bodies as the limit of flow of a very slightly viscous fluid. In this case the fluid leaves the body along a line called the LIKE OP SEPAHA'I'YON, forming the generation of a SURFACE OF SCISSION such that the speeds are not the same on both sides of the surface, thus forming a vortical layer. The classical hydrodynamics of perfect fluids must therefore be completed by the following axioms and corollaries: AXIOM I. Vortical layers may take their rise at lines of separation. AXIOM II. Along the sharp edges of a body, infinite speeds can i only occur exceptionally. COROLLARY I. In any body, the edges perpendicular to the direction of the current are always lines of separation and are therefore the causes of the formation of a vortical layer. COROLLARY II. The intensity of the vortexes in the vortical layer is such that the velocity along the edge has a constant value, or such that the tendency of the velocities to assume infinite values in this place is limited as far as possible. The determination of the velocities due to a certain system of vortexes may be simplified by assv.ming, in place of the body, "ATTACHED VORTEXES, the ac...


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Product Details
  • ISBN-13: 9781236378545
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 40
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1236378547
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 91 gr


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