Engineering Volume 21

Engineering Volume 21

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1876 edition. Excerpt: ...on the other side of it. i This last statement must be understood in the sense that the converging stream lines do not act as an impediment, and reduce the actual discharge below the theoretical quantity. In Ionc sense the convergence of the stream towards the orifice is the cause of the vena contracta, for without the convergin stream lines the ressure in the contracting vein coul not be kept up; ut on the other hand neither could the flow take place, when the whole question would collapse. My argument consists of only a few steps, and each of them seems to me to be beyond dispute 1. We know experimentally that the vein contracts for some distance outside of the orifice. and that, therefore, the velocity increases for the same distance 2. We know that it is a law of nature that nothing but greater pressure on one side of a particle than on the other can alter its velocity. 3. It follows that there must be internal ressu.re in the contracting vein, which gradually diminis es throughout the contracting part Having arrived at this certain conclusion we can reverse the reasoning as follows: l. VVe are certain that there is in all tho contracting part of the stream an internal and decreasing pressure from the orifice to the vena contracta. 2. We know that the decreasing pressure must produce increasing velocity, which must produce gradual diminution of the section of the stream. 3. We know that nothing but decreasing pressure can roduce the increase in the velocity which is essential for Pei-imental results; when some_one_ has done the same with he contraction of the vein.. reg_ard_to the ordinary theo_r, it then betime to discuss 4. It follows that the convergence of the stream hues to-which is the_righ_t one, if_ eit er is right; but if...show more

Product details

  • Paperback | 1026 pages
  • 189 x 246 x 51mm | 1,792g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236881117
  • 9781236881113