Measurement of Condensation Heat Transfer Coefficients at Stratified Flow Using Linear Raman Spectroscopy

Karl, Jürgen; Weiss, Tony

doi:10.1615/jflowvisimageproc.v4.i3.50

Cited by 2 publications

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“…19 Therefore, the intensity distribution of the five Gaussian peaks representing together the OH stretch vibration Raman signal of liquid water is also affected by temperature and thus has been frequently used as temperature indicator of liquid water, but yet only without water vapor being present. 10,[20][21][22] For the quantitative interpretation of the heat-and mass-transport mechanisms between the liquid and the gaseous phase of the spray the Raman sensor has to be calibrated, meaning that the intensities of the Raman signals of nitrogen I nitrogen , liquid water I water,liquid and water vapor I water,vapor have to be correlated with the concentrations n i of the respective compounds i. In order to make the evaluation of the Raman spectra independent of the overall signal intensity, we only consider ratios of Raman signals.…”

Section: Working Principle and Calibrationmentioning

confidence: 99%

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Simultaneous Analysis of the Dispersed Liquid and the Bulk Gas Phase of Water Sprays Using Raman Spectroscopy

et al. 2016

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Currently, a comprehensive physical description of sprays is not possible, as the involved heat- and mass-transport mechanisms have not yet been understood completely. Therefore, we here show and apply a straightforward Raman evaluation technique which simultaneously probes spatially resolved (i) droplet temperature, (ii) evaporation progress and (iii) entrainment of air into the spray. First, the working principle of the Raman technique and the calibration of the sensor are described. Then, the applicability of the Raman technique is demonstrated showing example measurement results obtained from a superheated water spray. The plausibility of the obtained measurement results is demonstrated comparing them with computations for thermodynamic equilibrium conditions. Information about the droplet temperature, the evaporation progress and the entrainment of air might complement the insights into heat- and mass-transport mechanisms which can already be provided applying other existing optical spray diagnostic techniques.

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