Scale problems in hydraulic models where density spread is simulated

Hassan, A. M. M (1962) Scale problems in hydraulic models where density spread is simulated. MSc(R) thesis, University of Glasgow.

Abstract

This thesis is primarily concerned with the search for an appropriate criterion for the design of hydraulic models so as to simulate density spread. In an attempt to acquire an adequate knowledge of the physical behaviour of density spread, the special case of two dimensional spread in a rectangular flume as found in lock type exchange flow was chose. A general review of work on such flows is given, followed by a derivation of the parameters pertaining to it. An experimental study of lock flows has led to confirmation of previous observation of the front and, seemingly for the first time as regards to hydraulic studies, to the finding of differential movements within and behind the fronts. This feature explains the great variations in the rate of decrease of front velocities within the range available in the flume; and this is shown to be related to the laminar or turbulent nature of the flow. The foregoing was confirmed by a study of the dilution in such flows. A preliminary examination of the "dam-burst" was made together with some qualitative and quantitative studies of dam-burst analogy exchange flows. The fronts in the latter case were examined and were compared with those of lock exchange flow. Again, differential movements of water masses behind the front was observed. Attention was then directed to the study of the three dimensional spreading of heated water in simple conditions. A reasonably good correspondence was achieved between a prototype of laboratory dimensions and a 1/5th model, for which the vertical exaggeration was based on a Keulegan type congruency diagram. The experimental work was carried out in a hydraulic circuit which was constructed for a previous basic study. The critical review made and the model operations described have, in the opinion of the Author, pointed to the necessary adoption of Keulegan type congruency diagrams for the design of models involving density spread.

• Item Type: Thesis (MSc(R))
• Qualification Level: Masters
• Additional Information: Adviser: D IH Barr
• Keywords: Hydraulic engineering, Fluid mechanics
• Date of Award: 1962
• Depositing User: Enlighten Team
• Unique ID: glathesis:1962-73747
• Copyright: Copyright of this thesis is held by the author.
• Date Deposited: 14 Jun 2019 08:56
• Last Modified: 14 Jun 2019 08:56
• URI: https://theses.gla.ac.uk/id/eprint/73747