Weakening of Ledinegg Instability and Maldistribution of Boiling Flow in Parallel Microchannels by Entry Effects

Jieyan Jiang, Changxu Chen, Haoxiang Huang () and Zhenhai Pan ()
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Jieyan Jiang: School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Changxu Chen: School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Haoxiang Huang: School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Zhenhai Pan: School of Mechanical Engineering, Shanghai Institute of Technology, Shanghai 201418, China

Energies, 2024, vol. 17, issue 8, 1-18

Abstract: In the pursuit of enhancing thermal management for miniaturized electronic devices, our study delves into the impact of entry effects on Ledinegg instability and flow maldistribution within parallel microchannels. Utilizing a coupled model that incorporates phase change and pressure drop dynamics in boiling flow, we examine microchannels characterized by a 50 length-to-diameter ratio and a 200 μm hydraulic diameter. Our findings unveil a significant influence of entry effects, which narrow the total flow excursion interval, thereby bolstering system stability. Specifically, as the heat flux escalates from 5 W/cm 2 to 120 W/cm 2 , the entry effects increasingly mitigate flow instability and maldistribution in parallel channels, diminishing the total flow rate range susceptible to flow instability by 4.73% and 47.52%, while narrowing the total flow rate range corresponding to uneven flow distribution by 4.70% and 46.75%, respectively. Furthermore, entry effects expand the inlet subcooling range necessary for stabilizing the parallel channel system by 38.89% and 1000%. This research not only underscores the importance of considering entry effects in microchannel design but also opens avenues for further exploration into enhancing thermal management solutions.

Keywords: microchannel; entry effects; flow boiling; instability (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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