It is operated on the principle that the temperature level of the wire persists to be constant. Here, the change in wire’s temperature value also modifies the resistance value. When the wire is placed in the liquid flow, then heat transfer takes place to liquid from the wire. In this method, the wire gets heated up by the electric current, the hot wire anemometer is kept in the fluid flow where here speed of the liquid flow can be calculated. Also, the wheat stone bridge calculates the change in resistance value that is equivalent to the liquid’s speed flow. As because the heat has a direct relation to the wire’s resistance, when heat value reduces, the wire’s resistance also gets decreased. Also, the wheat stone bridge is maintained at a steady voltage level. From the wire, a constant magnitude level of current is passed. In this method, the hot wire anemometer is kept in the fluid flow where here speed of the liquid flow can be calculated. The usage of hot wire anemometer allows rapid flow velocity that has to be measured from the electric voltage dimensions. In many of the scenarios, they will not be utilized for the calculation of direction of a wind, only when they are integrated with a wind vane. As the metal’s resistance is based on the temperature, a relation is developed in between the wire’s resistance and the speed of the liquid flow. The air that flows through it cools up the wire. These devices make use of a thin wire which is usually some micrometers electrically heated up to some level of temperature almost higher the ambient temperature range. This measurement is done by calculating the heat loss in the wire that is located in the liquid stream. This is the instrument used for the calculation of fluid direction and velocity. So, now let’s get into the concepts like its history, working principle, equation, uses, and benefits. In the later years, the design and construction of anemometers got changed and with this basic principle, a hot wire anemometer got developed. In the year 1846, Romney enhanced the anemometer design by implementing mechanical rotational wheels and semi-circular cups. Then, many versions came into existence developed by many scientists. The first anemometer was invented by Alberti in the year 1450 and it is of mechanical type. Initially, the enhancement of an anemometer started in the 15 th century. ![]() Well, let us start the topic of hot wire anemometer by knowing its history first, then we can move into the detailed concepts.
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