Calendar: 1971-1972 Page 432

Annual Report of the Delegacy lvii Activities in the academic sphere include lectures given by Dr Williams and Dr Tindal to the Universities Internal Combustion Engine Computer Group at Edinburgh University Public lectures by Professor Rose and Dr English were given at King's College in series devoted to Recent Developments in Powder Technology Dr Williams also lectured at the University of Surrey and at the Borough Polytechnic Dr English spent three months in the Division of Mineral Processing at the Royal Institute of Technology Stockholm where he took part in teaching and research work Encouraging progress in research was made and number of Ph theses were accepted In the field of internal combustion engineering and fluid flow the investigation of wave-action in multi-branch exhaust systems reached the stage when progress would be evaluated the relatively simple methods used in the analysis show distinct promise for practical application Work on gas flow measurement in cylinders proceeded well and interesting results were obtained relating to the production and decay of swirl Research into cyclic variations in cylinder pressure continues Progress with the turbocharging research outlined in last year's report is satisfactory Research into the use of engine exhaust heat for actuating absorption refrigeration has provided interesting results It is hoped to continue this work Other work in refrigeration now in progress includes studies of vortex tube refrigeration of stability of the evaporation and expansion valve control loop and of heat and mass transfer in cooling towers In powder technology variety of work is in progress Investiga- tions into the mixing of powders were expanded and further research was carried out in sieving processes The work on abrasives continued and valuable results were obtained in regard to the fracture of brittle materials under different loading rates Research on the performances of Acrefoil type mills is proceeding and promises to be of particular interest In metallurgy the work outlined previously continued and an electron microscope was acquired on semi-permanent loan from the Physics department This will be useful adjunct to the equipment in the Metallurgy laboratory Mr Prosser's work on vibration ploughing continued and further full-scale trials were carried out with an excava- tor fitted with vibrating blade Valuable financial support for the department's research work was received from various quarters The studentship in internal combustion