Holografic Interferometry used for Measurement of Temperature Field in Fluid

The presented paper shows the possibility of using holographic interferometry for measurement of temperature field in moving fluids. There are a few methods for identification of velocity fields in fluids, such us LDA, PIV, hot wire anemometry. It is very difficult to measure the temperature field in moving fluids. One of the often used methods is Constant Current Anemometry (CCA), which is a point temperature measurement method. Data are possibly acquired at frequencies up to 1000Hz. This frequency should be limiting factor for using of CCA in fluid when fast change of temperature occurs. This shortcoming of CCA measurements should be overcome by using of optical methods such as holographic interferometry. It is necessary to employ a special holographic setup with double sensitivity instead of the commonly used Mach-Zehnder type of holographic interferometer in order to attain the parameters sufficient for the studied case. This setup is not light efficient like the Mach-Zehnder type but has double sensitivity. The special technique of acquiring and phase averaging of results from holographic interferometry is also presented. The results from the holographic interferometry experiments will be compared with the temperature field achieved by methods CCA method.

Authors:

• Vít Lédl
• Tomáš Vít
• Pavel Psota
• Roman Doleček

Keywords:

• Holographic interferometry
• pulsatile flow
• temperature measurement
• hot-wire anemometry

References:

[1] Schnars U.; Jueptner W. Digital Holography. Berlin : Springer, 2005.
164 p
[2] V├¡t, T., Lédl, V.,Identification of the temperature field in pulsatile
impinging flow (2010) AIP Conference Proceedings, 1281, pp. 135-138.
[3] Dolecek R, Ledl V, Kopecky V, Psota P, Vaclavik J, Vit T, Prospects of
digital holographic interferometry in heat transfer measurement,
Experimental Fluid Mechanics 2009, Nov 25-27, 2009, Liberec, Czech
Republic
[4] Smith B.L. and Glezer A., 1998, The formation and evolution of
synthetic jets, Phys. Fluids, 10, 2281-2297
[5] Smith B.L., and Glezer A., 2002, Jet vectoring using synthetic jets, J.
Fluid Mech., 458, 1-34.
[6] Tr├ívn├¡─ìek Z., and Tesař V., 2003, Annular synthetic jet used for
impinging flow mass-transfer, Int. J. Heat Mass Transfer, 46, 3291-
3297
[7] Kercher D.S., Lee J.-B., Brand O., Allen M.G. and Glezer A., 2003,
Microjet cooling devices for thermal management of electronics, IEEE
Transactions on Components and Packaging Technologies, 26, (2), 359-
366.
[8] Trávníček Z., Hyhlík T., Maršík F., (2005), Synthetic jet impingement
heat/mass transfer. Journal of Flow Visualization and Image Processing,
Vol. 13, 2006
[9] Trávníček Z., Vogel J., Vít T. and Maršík F., 2005, Flow field and mass
transfer experimental and numerical studies of a synthetic impinging jet.
In 4th International Conference on Heat Transfer, Fluid Mechanics and
Thermodynamics - HEFAT2005, Cairo, Egypt, No. ZT4, 2005.
[10] Smith B.L. and Swift G.W., 2003, "A Comparison Between Synthetic
Jets and Continuous Jets," Exp. Fluids, Vol. 34, pp. 467-472.
[11] Kreis, T. Handbook of Holographic Interferometry : Optical and Digital
Methods . Berlin : Wiley, 2004.