Treatise on Physics Volume 1

Treatise on Physics Volume 1

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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. 1901 edition. Excerpt: ... of that curve, as indicated by the cross-lines. The pressure in the narrowest part of each stream-tube cannot be less than 527j9, nor p less than 685p0. Outside this the streams must widen and the velocity increase since p diminishes. If, however, the pressure p, outside the orifice be greater than this the flow will be in parallel tubes at the narrowest part and the pressure will be pv When the velocity of flow is greater than V no disturbance of pressure can be propagated back along the outflowing gas, since this would take place at velocity V, so that diminution of pressure below i)27p0 cannot affect the pressure behind the contracted vein. The discussion of this case is due to Professor Osborne Reynolds, Phil. Mag. March 188(5. The results agree with experiments made by Mr. R. D. Napier, Engineer, 18f!7, January 1 and 25. For adiabatic flow of a gas there are thus two values of the pressure for a value of the cross-section of the tube greater than its minimum value, one greater than '527pt and one less. Hence there are two possible values of the pressure at C (Fig. 187) in a tube of Fig. 188. varying section for which the pressure at the two equal necks A, B is b'llpQ. For a liquid the pressure at C is greater than at A or B. S72. Jet-Pump.--Fig. 188 shows the action of Professor James Thomson's jet-pump. A jet of water is driven at high velocity through the converging mouthpiece P, which opens at a point just a little short of the most constricted part of the surrounding tube T. This tube is connected by a side branch with the space from which the water is to be drawn. The flow of the water along the constricted neck of T gives by Bernoulli's theorem a lower pressure at the constriction than at the part beyond, and there more

Product details

  • Paperback | 260 pages
  • 189 x 246 x 14mm | 472g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 123665496X
  • 9781236654960