ABSTRACT
The main objective of experimental fluid mechanics is the measurement of local flow velocities, and in this respect, hot-wire anemometry (HWA) is without doubt the most versatile and widely used laboratory method. The King's law clearly illustrates the thermoelectric measurement principle of HWA, namely, that the cooling of the electrically heated hot wire is related to the voltage passing through the wire presumed that the fluid temperature, composition, and pressure are kept constant. However, since the heat transfer also depends on flow properties such as temperature, density, and composition, among others, these quantities can in principle also be measured and are therefore all part of thermal anemometry. This chapter ends with an overview of concurrent issues, their limitations and possible corrections as well as provides an extensive reference list for those planning to have an in-depth view on the subject.
