Numerical Investigation on the Symmetric Breakup of Bubble within a Heated Microfluidic Y-Junction
Abstract
:1. Introduction
2. Problem Description and Mathematical Model
2.1. Problem Description
2.2. Mathematical Model
3. Verification of the Numerical Model
4. Results and Discussion
4.1. Bubble Behaviors and Flow Characteristics
4.2. Two-Phase Heat Transfer Performance
4.2.1. Transient Heat Transfer
4.2.2. Time Variation of Heat Transfer
4.2.3. Heat Transfer Enhancement
5. Conclusions
- Bubble breakup behaviors were significantly affected by evaporation. The “breakup with tunnel” and “breakup with obstruction” modes respectively occurred at low and high q. The bubble successively experienced long-period squeezing stage and short-period pinch-off stage during the breakup process, where the breakup rate under pin-off stage was much larger. Along with increase in Re, the bubble broke more rapidly, and the critical neck thickness tended to decrease. The influence of heat flux on the breakup was weak. The downstream fluid accelerated more obviously at smaller Re and higher q. The bubble annihilated the vortices existing within the divergence region and made the fluid flow more uniform.
- The evaporating heat transfer was affected by bubble behaviors. Compared to the single-phase case, the heat transfer was drastically improved due to the evaporation under two-phase case. The most significant enhancement occurred at the leeward wall. The increase in Re promoted single-phase convective heat transfer while hindering the two-phase heat transfer. Slight negative enhancement of heat transfer existed at lower q. In addition, the phenomenon of heat transfer deterioration was observed at higher q. Generally, the heat transfer was enhanced as q was increased.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Properties | Liquid | Vapor |
---|---|---|
ρ (kg/m3) | 1425 | 5.15 |
μ (Pa·s) | 3.56 × 10−4 | 1.11 × 10−5 |
σ (N/m) | 0.0136 | 0.0136 |
cp (kJ/(kg·K)) | 1.430 | 0.900 |
λ (W/(m·K)) | 0.0618 | 0.0103 |
hfg (kJ/kg) | 117.8 | 117.8 |
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Chen, J.; Du, W.; Kong, B.; Wang, Z.; Cao, J.; Wang, W.; Yan, Z. Numerical Investigation on the Symmetric Breakup of Bubble within a Heated Microfluidic Y-Junction. Symmetry 2022, 14, 1661. https://doi.org/10.3390/sym14081661
Chen J, Du W, Kong B, Wang Z, Cao J, Wang W, Yan Z. Numerical Investigation on the Symmetric Breakup of Bubble within a Heated Microfluidic Y-Junction. Symmetry. 2022; 14(8):1661. https://doi.org/10.3390/sym14081661
Chicago/Turabian StyleChen, Jingbo, Wen Du, Bo Kong, Zhiguo Wang, Jun Cao, Weiran Wang, and Zhe Yan. 2022. "Numerical Investigation on the Symmetric Breakup of Bubble within a Heated Microfluidic Y-Junction" Symmetry 14, no. 8: 1661. https://doi.org/10.3390/sym14081661