Abstract
Separated heat pipe is an efficient passive heat transfer device. It is widely used in chemical and aerospace industry. In this paper, the heat transfer characteristics of the separated heat pipes which applied to containment cooling system were studied. According to the experimental data, the influences of the system pressure, the initial vacuum degree of the system, and the system resistance coefficient on the heat transfer capability of the separated heat pipes were analyzed. Based on the theoretical analysis, the correlation for the natural circulation flow rate of the system was obtained. Relative errors of experimental test data were less than ±20 %. Comparing the experimental data with the calculated results, it shows that main parameters that affect the heat transfer capability of the heat pipe loop are system state parameters (including system pressure, the temperature difference between heat source and heat sink as well as the resistance coefficient) and system boundary conditions (including noncondensable gas percentage and system boundary pressure). Natural circulation flow rate increases with the increase of the system pressure and the initial vacuum degree of the system.
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Abbreviations
- A :
-
Area, m2
- B :
-
Coefficient
- C :
-
Heat capacitance, kJ/(kg. °C)
- D :
-
Diameter, m
- f :
-
Friction coefficient
- g :
-
Gravitational acceleration, m/s2
- H :
-
Height, m
- h :
-
Enthalpy, kJ/kg
- K :
-
Resistance coefficient
- k :
-
Heat exchange coefficient
- L :
-
Length, m
- M :
-
Mass flow rate, kg/s
- P :
-
Pressure, MPa.a
- Q :
-
Heat power, kW
- Re:
-
Reynolds number
- S :
-
Velocity, m/s
- V :
-
Volume, m3
- X :
-
Comprehensive parameter
- Y :
-
Comprehensive parameter
- ρ :
-
Density, kg/m3
- β :
-
Volume expansion coefficient
- ξ :
-
Shape resistance coefficient
- Δρ :
-
Density difference, kg/m3
- ν :
-
Kinetic viscous of saturated liquid, m2/s
- θ :
-
Flow rate correction factor
- gs:
-
Saturated vapor
- ls:
-
Saturated liquid
- all:
-
System
- c :
-
Condenser
- d :
-
Wetted perimeter
- e :
-
Evaporator
- h :
-
Equivalent parameter
- I :
-
The ith section
- In:
-
Inlet
- out:
-
Outlet
- s :
-
Containment
- 0:
-
The initial value
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Cheng, C., Ju, P., Wen, Q., Lu, D., Li, Y., Meng, X. (2017). Experimental Study on Heat Transfer Characteristics of Separated Type Heat Pipe. In: Jiang, H. (eds) Proceedings of The 20th Pacific Basin Nuclear Conference. PBNC 2016. Springer, Singapore. https://doi.org/10.1007/978-981-10-2311-8_31
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DOI: https://doi.org/10.1007/978-981-10-2311-8_31
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