Effect of averaged flow temperature on readings of a hot-wire anemometer

Hot-wire measurements with automatic compensation of ambient temperature changes

“…A lot of papers, among them [13][14][15][16][17], and even a special review [18] are devoted to the problem of compensating the velocity reading of a hot wire for varying fluid temperature. Broadly speaking, three variants of solving the problem are known: (1) manual adjustment of the hot resistance R w to compensate for changes in T a (obsolete), ( 2) automatic compensation using an additional temperature sensor incorporated into the Wheatstone bridge (a separate measurement of T a is not necessary), and (3) analytical correction using a hot-wire heat-transfer relationship (a separate measurement of T a is necessary, the hot-wire probe is operated at a fixed hot resistance R w ) [19][20][21].…”