Comments on manufacturing and application of hot-wire probes in the flow laboratory

Improvements to hot-wire probes used very frequently in experimental fluid mechanics, are presented. In the field of turbulence research in particular, there are hardly any other instruments which can be so widely used. Although the hot-wire technique has been developed over a long period, problems still arise due, for example, to the design and shape of the probe with respect to the flow. Some of these problems, which stem from the flow around the probe holder, wire arrangement, and vibrations are discussed, they can be solved by special design of the probes.