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Title:
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Experimental study of single and two-phase adiabatic flow distribution in compact heat exchangers
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Author:
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POGGI , Frédéric; Hélène Macchi-Tejeda; Alain Maréchal; Denis Leducq; André Bontemps |
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Abstract:
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Small-channel heat exchangers are widely used for car air-conditioning. However information about their behaviour remains scarce. An experimental device was built to characterize the distribution of single and two-phase adiabatic flows in a small channel heat exchanger, and to measure its singular and regular pressure losses. A transparent polycarbonate test section comprised a 16 mm diameter header connected to 8 flat tubes with 7 small channels (Dh = 0.889 mm). Both were studied with horizontal flow and vertical down-flow through the manifold. The mass flux range was between 15 and 650 kg/(m².s) in the manifold and between 100 and 3 000 kg/(m².s) in the small channels. The range of vapour quality values at the test section inlet was between 0.1 and 0.9. The two-phase refrigerant was condensed at the outlet of each flat tube in order to measure each flow rate separately. |
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URI:
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http://hdl.handle.net/2042/15987
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Date:
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2007-08-30 |
