Investigation of Hydrodynamic and Heat Transfer Characteristics of Gas-liquid Taylor flow in Square Microchannel
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Zunlong Jin
Abstract
Heat transfer and flow characteristics under air-water Taylor flow in a square microchannel with T-junction were investigated in this work. Different hydraulic diameters of models were discussed numerically by VOF method. Flow patterns such as bubbly flow, slug flow, annular flow and churn flow were identified by both numerical simulation and experimental methods. Simulation results including bubble formation process, bubble length, bubble velocity, void fraction and heat transfer fit well with literature data. The pressure differential of two sides in gas phase played an important role in bubble development. The gas and liquid superficial velocities were found to have a significant impact on bubble behavior. And the higher liquid viscosity would promote higher bubble velocity, also enhance heat transfer, but weaken the void fraction. The results showed a tiny but not ignorable effect of geometric dimensioning on bubble and liquid slug lengths. An appropriate correlation was proposed to estimate bubble length, and the deviation was −10 ~ + 15 %. By using moving frame of reference technique, the internal circulations inside the moving slugs were displayed more clearly.
Funding source: Natural Sciences and Engineering Research Council of Canada
Award Identifier / Grant number: RGPIN-2015-06314
Funding statement: This work was supported by Natural Sciences and Engineering Research Council of Canada, Funder Id:http://doi.org/10.13039/501100000038, Grant Number: RGPIN-2015-06314
Nomenclature
- Ca
Capillary number (Ca = μLjTP/σL)
- c
specific heat capacity (J/kg·K)
- Dh
hydraulic diameter (mm)
- g
acceleration due to gravity (m/s2)
- h
convective heat-transfer coefficient (W/m2·K)
- j
superficial velocity (m/s)
- LB
length of gas bubble (mm)
- LS
length of liquid slug (mm)
- Nu
Nusselt number (Nu = hDh/λ)
- p
pressure (Pa)
- q
heat flux (W/m2)
- Q
flow rate (mL/min)
heat generation (W/m3)
- T
fluid temperature (K)
- t
time of gas bubble formation (s)
- U
average velocity (m/s)
- ΔT
temperature difference (K)
- Greek Letters
- α
void fraction
- β
gas volumetric quality
- θ
wall contact angle
- λ
thermal conductivity (W/m·K)
- μ
dynamic viscosity (Pa·s)
- ρ
fluid density (kg/m3)
- σ
surface tension (N/m)
- Subscripts
- B
gas bubble
- G
gas phase
- L
liquid phase
- S
liquid slug
- TP
two phase
- Abbreviations
- FFR
fixed frame of reference
- MFR
mixed frame of reference
- VOF
the volume of fluid method
Acknowledgements
We gratefully acknowledge the financial supports for this project from the National Natural Science Foundation of China (No. 21676257).
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