Abstract
The ammonia absorption method (AAM) and transient liquid crystal thermography (LCT) are employed to measure convective mass and heat transfer accurately with high local resolution. Both optical methods use fully automated imaging techniques and evaluation. By analogy the mass transfer results are converted to heat transfer results. The LCT needs optical accessibility during the experiment, the AAM does not. Experimental set-ups, procedures and results are given. The AAM and LTC results are compared for the very complex three dimensional channel flow with heat transfer generated by wing type vortex generators at one channel wall. Global and span averaged Nusselt number differences are below the individual error estimates of 5%. Local differences can be higher and are traced to differences in boundary conditions. For local measurements the AAM is superior to the LCT because of the constant concentration/temperature boundary condition.
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Fiebig, M., Schulz, K. (1999). Ammonia Absorption Method and Liquid Crystal Thermography for Accurate Local Mass and Heat Transfer Measurements. In: Lehner, M., Mewes, D. (eds) Applied Optical Measurements. Heat and Mass Transfer. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-58496-1_2
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DOI: https://doi.org/10.1007/978-3-642-58496-1_2
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