The present experimental investigation is concerned with boiling heat transfer of water inside both horizontal and inclined rectangular channels under a relatively low heat flux. These configurations simulate the absorber channel of line-focus solar concentrations under boiling conditions. The experimental facility includes electrically heated aluminum rectangular channels with aspect ratios of 2.67 and 0.37. The experimental results of the two-phase Nusselt number for the two aspect ratios and for the inclination angles 0, 15, 30, and 45 deg were correlated in terms of a ratio of the two-phase to the liquid-phase Reynolds number for the forced-convection vaporization region. The proposed correlations agree well with previous investigations. In the present work, classifications of the various flow patterns were made by direct observation through a glass window at the end of the test section.
Boiling Heat Transfer in Horizontal and Inclined Rectangular Channels
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Morcos, S. M., Mobarak, A., Hilal, M., and Mohareb, M. R. (May 1, 1987). "Boiling Heat Transfer in Horizontal and Inclined Rectangular Channels." ASME. J. Heat Transfer. May 1987; 109(2): 503–508. https://doi.org/10.1115/1.3248111
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