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The hot wire when placed in the stream of the fluid, in that case, the heat is transferred from wire to fluid, and hence the temperature of wire reduces. The resistance of wire measures the flow rate of the fluid. The hot wire anemometer is used as a research tool in fluid mechanics.

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• An anemometer is a device used for measuring wind speed, and is also a common weather station instrument. The term is derived from the Greek word anemos, which means wind, and is used to describe any wind speed instrument used in meteorology. The first known description of an anemometer was given by Leon Battista Alberti in 1450.

• Uses of an Anemometer. Tube anemometers, also classified as pressure anemometers, employ a vessel at the top with an opening to record wind pressure. The pressure that occurs through the mouth of the opening causes changes to the internal pressure of the compartment, allowing the wind pressure to be calculated.

• An anemometer is a measuring instrument used to measure wind speed or other gaseous movement its most commonly used in weather observations. “Professional” anemometers generally measure air movement with cups mounted on horizontal spikes that are fastened to a center shaft.

• Hot Wire Anemometer. Definition: The Hot Wire Anemometer is a device used for measuring the velocity and direction of the fluid. This can be done by measuring the heat loss of the wire which is placed in the fluid stream. The wire is heated by electrical current. The hot wire when placed in the stream of the fluid, in that case,...

Hot Wire Anemometer. Definition: The Hot Wire Anemometer is a device used for measuring the velocity and direction of the fluid. This can be done by measuring the heat loss of the wire which is placed in the fluid stream. The wire is heated by electrical current.

In hot wire anemometer, the heat transferred electrically to the wire which is placed in the fluid stream. The Wheatstone bridge is used for measuring the temperature of wire regarding their resistance. The temperature of the wire remains constant for measuring the heating current.

They are divided into hot wire anemometers, vane anemometers and Pitot tube anemometers according to their operating principle. Hot wire anemometers and hot film anemometers use the relationship between flow velocity and heat emission; that is why they are also referred to as thermal anemometers.

Configuration for coordinate system and hot-wire probe (Dantec Dynamics TM 55P11). The most essential part of the hot-wire anemometer is the thin wire sensor where forced convective heat transfer takes place from the wire to flow over the wire. A comprehensive review can be found in Perry (1982) and Lomas (1986).