Abstract
In this study, experiments were performed to investigate the flow boiling of deionized water in a rectangle (1 mm × 2 mm) horizontal long mini channel, and visualization experiments were carried out to study the transformations of flow patterns. Uniform heating (UH for short) and step-changing heating (SCH for short) were studied. The local heat transfer coefficients during both heating methods were compared and analyzed. Heat transfer coefficient curves showed same trends, but the slope of local heat transfer coefficient under of SCH was steeper and the occurrence of the dry-out flow would make the local heat transfer coefficient decrease. Besides, six kinds of flow patterns were observed, and an amendment correlation was proposed for a better prediction of heat transfer coefficient.
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Abbreviations
- a :
-
Coefficient [−]
- C :
-
Index number [−]
- Cp :
-
Specific heat capacity [J/kg K]
- D :
-
Diameter [m]
- D h :
-
Hydraulic diameter [m]
- G :
-
Mass flux [kg/m2 s]
- H :
-
Height [m]
- h lv :
-
Latent heat [J/kg]
- h :
-
Heat transfer coefficient [W/m2 K]
- I :
-
Current [A]
- k :
-
Heat conductivity coefficient [W/m K]
- L :
-
Length [m]
- m :
-
Mass flow rate [kg/s]
- Nu:
-
Nusselt number [−]
- P :
-
Pressure [Pa]
- Pr:
-
Prandtl number [−]
- Q :
-
Quantity of heat [W]
- q :
-
Heat flux [W/m2]
- R :
-
Parameter of uncertainty [−]
- Re:
-
Reynolds number [−]
- T :
-
Temperature [K]
- U :
-
Voltage [V]
- V :
-
Velocity [m/s]
- W :
-
Width [m]
- x :
-
Vapor quality [−]
- z :
-
The distance from the entrance [m]
- η :
-
Thermal diffusivity [m2/s]
- κ :
-
Constant [−]
- υ :
-
Kinematic viscosity [m2/s]
- ρ :
-
Density [kg/m3]
- ave :
-
Average
- eff :
-
Effective
- exp :
-
Experimental
- f :
-
Fluid
- i :
-
Sequence number
- in :
-
Inlet
- l :
-
Liquid phase
- out :
-
Outlet
- pre :
-
Prediction
- sat :
-
Saturation
- sub :
-
Subcooled
- w :
-
Wall surface
- v :
-
Vapor phase
- x :
-
x-direction
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Acknowledgements
This research was supported by Fundamental Research Funds for the Central Universities (2018JBZ108) and National Natural Science Foundation of China (No. 51776015).
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Highlights
• Uniform heating and step-changing heating were studied.
• The slope of local heat transfer coefficient of step-changing heating was steeper.
• An amendment correlation was proposed for a better prediction of heat transfer coefficient
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Huang, Q., Jia, L., Dang, C. et al. Experimental study on the effect of step-changing heating on water flow boiling in a horizontal long mini channel. Heat Mass Transfer 56, 973–988 (2020). https://doi.org/10.1007/s00231-019-02747-2
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DOI: https://doi.org/10.1007/s00231-019-02747-2