By Werner J. A. Dahm, Kenneth B. Southerland, Kenneth A. Buch (auth.), Professor R. J. Adrian, Professor D. F. G. Durão, Professor F. Durst, Professor M. Maeda, Professor J. Whitelaw (eds.)

This quantity contains papers chosen from the lawsuits of the 5th foreign Symposium on functions of Laser concepts to Fluid Mechanics, held on the Calouste Gulbenkian beginning in Lisbon from nine to twelve July, 1990. Relative to prior conferences within the Lisbon sequence the scope of this symposium was once broadened through increasing the topical insurance to incorporate all laser strategies utilized in fluid mechanics. this alteration famous the fad among experimental fluid dynamicists to hire laser innovations for the mea­ surement of many various amounts, together with focus, temperature, particle measurement, and speed, and the necessity for researchers to have a discussion board during which to speak their paintings and percentage their universal pursuits. The 5th Symposium contained twenty-three periods of formal shows and a full of life Open discussion board ses­ sion. moreover, Dr. H. J. Pfeiffer equipped a different Workshop at the Use of desktops in circulation Mea­ surements which contained 5 periods on frequency area processors, correIa tors, targeted detectors, and biasing.

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Extra info for Applications of Laser Techniques to Fluid Mechanics: 5th International Symposium Lisbon, Portugal, 9-12 July, 1990

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The measurement points were 1 and 3 cm above the heater. The heater power was 250 W. In Fig. 12(a), the temperature variations measured by the thermocouple and by the fluorescence method are shown together with the velocity variation. The fluctuations of temperature and velocity are shown in Fig. 12(b), and the temperature - velocity correlations are calculated and shown in Fig. 12(c). The fluorescence intensity increased with decreasing temperature and decreased with increasing temperature. The correspondence of the temperatures measured by fluorescence and by the thermocouple was excellent and the effect of the Mie scattering particles on the fluorescence was not observed.

Examples of experimental resul ts for an axisymmetric jet of propane entering a slow coflow of air are presented. It is shown that the measurements provide new insights into turbulent mixing behavior. Introduction Despite significant advances, it remains difficult to predict many behaviors of turbulent flows. Experimental characterization is required for development and validation of physical models. In order to describe the mixing in turbulent flows, time-resolved simUltaneous measurements of scalar concentration and velocity are needed.

1 As seen cm is At 3 cm above the heater, the velocity fluctuation is large and the correlation peaks are not obvious and the correlation diagram shows weaker relation between the temperature and the velocity. It is found that the fluorescence method can provide better correlation of temperature and velocity than that obtained by the thermocouple. CONCLUSIONS We have been developing a system for simultaneous measurement of temperature and velocity, using laser induced fluorescence and laser Doppler velocimetry.

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