Calendar: 1967-1968 Page 424

Annual Report of the Delegacy xcv fields of induction studies of velocity measurements within an engine cylinder and of lubricating oil contamination Work is in progress on computer programme for turbocharged engine simulation and an exploration of an ionisation tracer technique for air-flow measurement was begun The effects of compression ratio and injection timing in diesel engine with constant peak cylinder pressure arc also being ex- amined In the field of refrigeration work on two-phase flow is nearing com- pletion and an investigation of heat transfer between condensing vapour and vertical surface sometimes in the presence of non- condensible gas is being terminated Other projects include the effect of motion of the cooling surface on the heat-transfer coefficient under condensing conditions the use of mixed refrigerants in vapour com- pression plant and the effect of oil or circulation on refrigerator per- formance Work is also in progress on study of heat transfer from cer- tain types of finned heat exchangers Research in the metallurgy laboratory centred on further examina- tion of the interactions between molten sodium and steels of im- portance in nuclear-reactor heat exchangers the setting up of micro- scope hot stage operated by electron bombardment and the plating and properties of cobalt-phosphorus alloys In the field of Powder Technology work on number of topics of interest continued Investigations into the occurrence of physical and chemical changes during the milling of quartz suggest transformations between the various crystalline forms of the material but the production of an amorphous form is unlikely Work on the penetration of granular materials by bodies of various shapes continued and formula which correlates well with the driving characteristics of full-size piles was deduced In connection with the work upon the strengths of sacks containing granular materials interesting data relating to the transfer of energy from the granular material to the material of the sack during an impact was obtained Various statistical relationships were also developed and the findings embodied in published paper Work is in progress on the discharge of cohesive materials from bins and hoppers on the measurement of particle size of powders in the sub-micron range and comminution In connection with the latter topic development of various theoretical aspects of the problem con- tinued and paper is in the press