VELOCITY DISTRIBUTION FACTORS IN A CIRCULAR CROSS-SECTION

LABORATORY TESTS WERE CONDUCTED ON THE DETERMINATION OF THE RELATIONSHIP BETWEEN THE MEAN VELOCITY OF FLOW AND THE INTEGRATED VELOCITIES AS REQUIRED FOR ENERGY AND MOMENTUM COEFFICIENTS FOR FREE SURFACE FLOW IN A SMOOTH CIRCULAR CONDUIT. ACTUAL POINT VELOCITIES WERE MEASURED BY FIVE OTT- TYPE SMALL CURRENT METERS MOUNTED ON A FRAME SUCH THAT THEY CAN BE ROTATED AROUND THE CENTER OF THE PIPE AT VARIOUS ANGLES IN THE TRANSVERSE PLANE. THEN THE NUMERICAL INTEGRATION METHOD, BASED ON THE VELOCITY PROFILES IN A PIPE FLOWING FULL, WAS USED IN CALCULATING THE COEFFICIENTS FROM THESE MEASURED VELOCITIES. THE MEASUREMENTS WERE MADE IN A THREE-FOOT DIAMETER, 820-FOOT LONG SMOOTH STEEL PIPE. THE SLOPES VARIED FROM 0.000032 TO 0.001022 AND THE RELATIVE WATER DEPTH OF FLOW TO THE PIPE DIAMETER RANGED FROM 0.277 TO 0.998, WITH REYNOLDS NUMBER BETWEEN 0.4 TO 3 X 10 EXPONENT 5. THE RESULTS INDICATE THAT FOR REYNOLDS NUMBER BETWEEN 1.25 AND 3 X 10 EXPONENT 5, REPRESENTATIVE VALUES FOR THE COEFFICIENTS WOULD BE 1.03 AND 1.01 RESPECTIVELY.

  • Supplemental Notes:
    • State Cpr 11-3584, 100-45-31-13-3663-021
  • Corporate Authors:

    Colorado State University, Fort Collins

    Fort Collins, CO  USA  80523
  • Authors:
    • Barnes, A H
  • Publication Date: 1966-10

Subject/Index Terms

Filing Info

  • Accession Number: 00203962
  • Record Type: Publication
  • Source Agency: Bureau of Public Roads /US
  • Files: TRIS
  • Created Date: Jul 5 1994 12:00AM