Experimental study on condensation heat transfer inside a single circular minichannel |
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| Authors: | Marko Matkovic Alberto Cavallini Davide Del Col Luisa Rossetto |
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| Affiliation: | 1. Università degli Studi di Padova, Dipartimento di Ingegneria Industriale, Via Venezia, 1, 35131 Padova, Italy;2. Université Paul Sabatier, Laboratoire Plasma et Conversion d''Energie, 118 route de Narbonne, Bat3R1, 31062 Toulouse, Cedex 09, France;3. Université libre de Bruxelles, Microgravity Research Centre, Av. F. Roosevelt 50, CP 165/62, 1050 Brussels, Belgium;1. Department of Chemical Engineering, Ilam University, 69315-516 Ilam, Iran;2. Department of Computer and Information Technology, Ilam University, 69315-516 Ilam, Iran;3. Department of Energy and Process Engineering, Norwegian University of Science and Technology (NTNU), NO-7491 Trondheim, Norway |
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| Abstract: | The measurement of the condensation heat transfer coefficient inside micro- and minichannels is still somewhat elusive due to the difficult task of getting accurate values of the heat transfer coefficients during the condensation process, particularly when studied within single minichannels. The present paper reports local heat transfer coefficients obtained from the measurement of the local heat flux and the direct measurement of the saturation and wall temperatures during condensation of R134a and R32 within a single circular 0.96 mm diameter minichannel. Except for the lowest mass velocity, the test results do not show significant discrepancy from the trends expected for macroscale tubes. |
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