Hot Wire Anemometry
Source: Ricardo Mejia-Alvarez and Hussam Hikmat Jabbar, Department of Mechanical Engineering, Michigan State University, East Lansing, MI
Hot-wire anemometers have a very short time-response, which makes them ideal to measure rapidly fluctuating phenomena such as turbulent flows. The purpose of this experiment is to demonstrate the use of hot-wire anemometry.
- Measure the width of the slit, W, and record this value in table 1.
- Verify that the data acquisition system follows the schematic in Figure 2.
- Connect the positive port of the pressure transducer (see Figure 2 for reference) to the plenum pressure tap (
). - Leave the negative port of the pressure transducer open to the atmosphere. Hence, the reading of this transducer will be directly
The experimental measurements are listed in Table 2 and shown in Figure 5. A linear regression of these data produced the following result for equation (6):
(9)
Which can be used to determine the velocity as a function of the voltage:
Given that turbulence exhibits high frequency velocity fluctuations, hot-wire anemometers are suitable instruments for its characterization due to their high time-resolution. In the present experiment, we demonstrated the process of calibrating a hot-wire anemometer. To this end, we compared the voltage signal of the anemometer with known values of velocity at the vena contracta of a well-characterized jet. These measurements were used to determine the calibration constants for the linear response of the anemome
- Chapra, S.C. and R.P. Canale. Numerical methods for engineers. Vol. 2. New York: McGraw-Hill, 1998.
- King, L.V. On the convection of heat from small cylinders in a stream of fluid: determination of the convection constants of small platinum wires with applications to hot-wire anemometry. Philosophical Transactions of the Royal Society of London. Series A, Containing Papers of a Mathematical or Physical Character 214 (1914): 373-432.
- White, F. M. Fluid Mechanics, 7th ed., McGraw-Hill, 2009.
- Munson, B.R., D.F. Young, T.H. Okiishi. Fundamentals of Fluid Mechanics. 5th ed., Wiley, 2006.
- Buckingham, E. Note on contraction coefficients of jets of gas. Journal of Research, 6:765-775, 1931.
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