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    Applications of laser Doppler velocimeter in chemical engineering
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    Abstract:
    The research work in chemical engineering always deals with fluid, its velocity needs to measure. The laser Doppler velocimeter (LDV) used as a non contact measurement means features high accuracy, good repetition, rapid kinetic responsibility and broad interval of measurement and so on. Hence the LDV is widely used in chemical engineering research, especially in the fluid flow measurements, turbulence, heat and mass transfer, flow structure as well as combustion. The potential use of this advanced measuring technique in chemical engineering research is reviewed.
    Pneumatic-conveyed solid flows are common in many industrial processes. The flow speed may be high and varying. The density of solids may also change with time. The mass flow rate is usually difficult to quantify for such multphase flows. On the other hand, microwave Doppler radar has been used as a device for velocity measurement or motion detection. It would be feasible to use such a device for solid flow measurements. In this paper, the principle of using microwave Doppler radar for such an application is investigated. Experimental results obtained using a microwave Doppler velocimeter for different types of solid flows in a laboratory environment are presented.
    Acoustic Doppler velocimetry
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    Narrow linewidth tunable lasers augur a new kind of laser Doppler velocimetry employing resonant absorption and fluorescence from trace atomic species rather than scattering from particles. This technique may provide better turbulence and small volume information than present velocimetry.
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    Velocimetry
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