Influence of Inclination Angle on the Start-up Performance of a Sodium-Potassium Alloy Heat Pipe

Guo, Quansheng; Guo, Hang; Yan, Xiang-Ping; Ye, Fang; Fang, Chong

doi:10.1080/01457632.2017.1370325

Cited by 19 publications

(9 citation statements)

References 14 publications

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“…The shape of heat pipe is cylindrical, the parameters of the Na-K alloy heat pipe is presented in Table 2. In our previous work [24], the Na-K heat pipe had best start-up performance under the length of evaporator, condenser, and adiabatic section in Table 2. The heating system is composed of single-phase full digital thyristor power controller, voltage regulating power supply and heating furnace, which can realize the constant temperature heating and the constant power heating of Na-K alloy heat pipe.…”

Section: Experimental Setup and Proceduresmentioning

confidence: 90%

“…Under cooling water cooling, geyser boiling phenomenon occurred, and the start-up temperature and working temperature of heat pipe were lower than those under natural convection. Compared with the study of heat transfer performance of Na-K alloy heat pipe under natural convection cooling by Guo et al [24], geyser boiling can reduce the lowest working temperature of Na-K alloy heat pipe. Under forced convection cooling of cooling water, when the heating temperature reached 600 • C, geyser boiling occurred in the heat pipe and the heat transfer quantity increased.…”

Section: Literature Reviewmentioning

confidence: 94%

“…Under forced convection cooling of cooling water, when the heating temperature reached 600 • C, geyser boiling occurred in the heat pipe and the heat transfer quantity increased. But under the same heating conditions and natural convection cooling, the phase transformation process of working fluid became violent only when the heating temperature reached 725 • C [23,24]. Moreover, geyser boiling can transfer more heat at lower temperatures.…”

Section: Literature Reviewmentioning

confidence: 99%

“…Moreover, geyser boiling can transfer more heat at lower temperatures. When the heating temperature was 650 • C, the heat transfer quantity under natural convection cooling of air was 475 W [24], and the heat transfer quantity under cooling water was 790 W [22].…”

Section: Literature Reviewmentioning

confidence: 99%

“…When the length of condenser section is too long, the working fluid is not easy to fill the whole heat pipe [22,23]. When the length of the condenser section is too small, the condenser amount of the working medium is small, which increases the gas pressure [23,24]. The inclination angle of heat pipe will affect the effective heating area of evaporator and the driving force of reflux liquid, and the most suitable inclination angle of Na-K alloy heat pipe is 55 • [25].…”

Section: Introductionmentioning

confidence: 99%

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In the geyser boiling mode, the working fluid state is divided into a boiling process and a quiet process, and the sodium-potassium (Na-K) alloy heat pipe can discontinuously transfer heat at each boiling. The overheating of the liquid working fluid at the bottom causes short-term boiling and forms slug bubble, the strong condensing ability quickly conducts heat from the evaporator section. And geyser boiling can occur before the working fluid forms continuous flow, so it transfers more heat at lower temperatures than natural convection cooling. In this study, the heat transfer process of a Na-K alloy heat pipe with forced convection cooling under different heating power was experimental studied. The geyser boiling mode can make the Na-K alloy heat pipe work below 650 °C and reduce the start-up time. In the process of geyser boiling, the heat transfer quantity was increased by the boiling frequency and the amount of vapor produced in a single boiling. The boiling temperature had no obvious change with the increased of heating power, and the condenser section temperature increased with the heating power.

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Section: Experimental Setup and Proceduresmentioning

confidence: 90%

Section: Literature Reviewmentioning

confidence: 94%

Section: Literature Reviewmentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%