Quantification of the water boiling heat transfer in micro-structures by image analysis |
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Authors: | C Ferret L Falk A Chenu U DOrtona T T Veenstra |
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Institution: | a CNRS-LSGC-ENSIC, 1 rue Grandville, 54000, Nancy, France;b CNRS-LMSNM, 38 rue Frederic Joliot Curie, 13451, Marseille Cedex 20, France;c MESA+ Research Institute, University of Twente, PO Box 217, 7500 AE, Enschede, The Netherlands |
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Abstract: | The heat transfer performance of a micro-vaporizer has been measured by conventional methods (using temperatures, flow rates, effective power input). The study was carried out for laminar flow in channels (5 mm×3 cm×200 μm) micro-structured with square obstacles to increase the specific area. The results show that high heat transfer coefficients (1300– 2500 W m−2/C−1) can be reached in such a micro-structured channel. Image analysis was done to estimate the volume vapour fraction, which can be converted into the mass vapour fraction using a slip ratio and avoids the need for any temperature or electric power input measurements. The estimation of this slip ratio is discussed in this paper. |
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Keywords: | Heat transfer Micro-structure Laminar Boiling Image analysis |
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