Experimental study on the pressure drop oscillation characteristics of the flow boiling instability with FC-72 in parallel rectangle microchannels

LV, Y, XIA, G, CHENG, Lixin and MA, D (2019). Experimental study on the pressure drop oscillation characteristics of the flow boiling instability with FC-72 in parallel rectangle microchannels. International Communications in Heat and Mass Transfer, 108: 104289.

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Abstract

Experiments of the pressure drop instability of flow boiling with FC-72 in 8 parallel rectangle microchannels with a hydraulic diameter of 88 μm were conducted in this study. The mass flux ranges from 578.2 to 2310.9 kg/m2 s, the heat flux ranges from 0 to 1200 kW/m2 and the measured pressure drop ranges from 13 to 275 kPa. The compressive volume in a nitrogen vessel before the test microchannels is set as 0, 5 and 15 ml in the experiments. The experimental results of heat transfer, pressure drop and the corresponding flow patterns are presented and analyzed. Furthermore, the critical vapour qualities at the onset of the flow boiling instability (OFBI) are predicted by a theoretical model considering the local pressure and the frictional pressure resistances. The calculated and experimental results indicate that the instable zones in a flow boiling stability map expand with increasing the compressive volume and decreasing the two types of resistances. The critical vapour quality at OFBI changes from 0.65 to 1 when the local pressure resistance combination coefficient is increased to 7.33 × 10−3 or the frictional pressure resistance combination coefficient is increased to 0.532. The physical mechanisms behind the phenomena are discussed according to the experimental results.

Item Type:	Article
Uncontrolled Keywords:	Experiment; Microchannels; Flow boiling instability; Flow patterns; Pressure drop oscillation; Mechanisms; 0913 Mechanical Engineering; Mechanical Engineering & Transports
Identification Number:	https://doi.org/10.1016/j.icheatmasstransfer.2019.104289
SWORD Depositor:	Symplectic Elements
Depositing User:	Symplectic Elements
Date Deposited:	19 May 2022 13:51
Last Modified:	12 Oct 2023 12:01
URI:	https://shura.shu.ac.uk/id/eprint/29920

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