Higman, Chrisopher Adrew Austin2015-07-292015-07-292015-07-29http://hdl.handle.net/10539/18161A dissertation presented to the Faculty of Engineering, University of the Witwatersrand, in fulfilment of the requirements for the degree of Master of Science in Engineering. Johannesburg, 1977enSwirling flow in helically welded pipes and its effect on orifice flow metersThesis