The towing tank consists of a simple trough of water, 4 m in length, with an external model-carrying carriage running along rails on the top of the tank support frame. The carriage is towed by means of wires by an electric motor and gear arrangement which give a speed range of 1 mm/s to 100 mm 1/s. Backgournd motions in the water of the tank are a little greater than 0.2 mm/s even when the tank is housed in a temperature-controlled room. The investigation of these motions and their reduction is described. The background motions are due to thermal convection. Three treatments are applied: insulation, the prevention of evaporation by a surface oil layer, and the production, by surface heating, of a small stable stratification. At each stage the velocity profiles in the tank are measured. At the final stage the maximum velocities are about one tenth of the initial maximum velocity. Appreciable motion is restricted to bottom and surface layers of about 80 mm in thickness in the 365 mm depth of water. There are negligible motions in the central 200 mm of the depth.

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  • Corporate Authors:

    Institute of Physics (Great Britain)

  • Authors:
    • Anagnostopoulos, E
    • Gerrard, J H
  • Publication Date: 1976-11

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Filing Info

  • Accession Number: 00165415
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Files: TRIS
  • Created Date: Nov 23 1977 12:00AM