科研之友
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摘要
The digital computer has revolutionised the ability of the experimentalist to obtain, analyse and interpret physical data, and no-where is this more apparent than in the study of fluid flow and heat transfer problems. The emergence of digital methods is reviewed, with the discussion reflecting the first author's personal experience over the past 50 years. To illustrate how modern experimental study relies heavily on digital technology, representative results are presented for a number of fluid flow problems that have been investigated using advanced forms of optical instrumentation namely laser light sheet visualisation, three-component laser Doppler anemometry (LDA), and particle image velocimetry (Ply). These examples are used to emphasise the importance of digital methods for data capture and analysis, with samples of the reduced results being presented in the form of multi-functional colour graphs and images. The discussion shows how the processed data can yield improved understanding, revealing complex three-dimensional flow features that probably could not have been identified, and certainly could never have been quantified, in previous years. Colour, specifically, is shown to have emerged with increasing prominence in the last few decades, and its various uses are now seen to be crucial for the modern experimentalist. These aspects are comprehensively discussed.
- 出版日期2011-3
