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Pressure drop related to flow maldistribution in a model minichannel plate heat exchanger

Abstract

The paper describes the issues related to the pressure drop that accompanies the phenomenon of maldistribution of working fluid between the channels of a model minichannel plate heat exchanger. The research concerns a single exchanger's plate containing 51 (in every geometry) parallel rectangular minichannels of hydraulic diameters 461 µm, 571 µm, 750 µm and 823 µm. In addition, the more complex geometry has been investigated, equipped with additional diagonal channels (so called extended geometry). The moment of the liquid phase transition through the heat exchanger was recorded at the flow rates from 0.83 g/s to 13.33 g/s in the inlet manifold. The article discusses the total pressure drop as a function of the flow rate and the characteristic dimension of minichannels, as well as the pressure drop as a function of the time of the fluid passage through the main part of the measuring section in which measurements were done. The resulting profiles correlate with the images of the flow distribution between channels recorded using the fast shutter speed camera, that allows to draw a further conclusions about the specifics of the maldistribution process. The impact of the total pressure drop on the actual range of optimum operating conditions of the heat exchanger was analyzed.

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Category:
Articles
Type:
artykuły w czasopismach recenzowanych i innych wydawnictwach ciągłych
Published in:
Archives of Thermodynamics no. 39, edition 2, pages 123 - 146,
ISSN: 1231-0956
Language:
English
Publication year:
2018
Bibliographic description:
Klugmann M., Dąbrowski P., Mikielewicz D.: Pressure drop related to flow maldistribution in a model minichannel plate heat exchanger// Archives of Thermodynamics. -Vol. 39., iss. 2 (2018), s.123-146
DOI:
Digital Object Identifier (open in new tab) 10.1515/aoter-2018-0015
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Sources of funding:
Verified by:
Gdańsk University of Technology

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