The paper describes issues related to 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, 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 ranging from 0.83 g/s to 13.33 g/s in the inlet
manifold. The paper 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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