Parametric study on flow and heat transfer characteristics of porous wick evaporator based on AMTEC

Wu, Shuang–Ying; Cao, Bao-Xi; Xiao, Lan; Li, You–Rong

doi:10.1007/s12206-011-1250-x

Cited by 8 publications

(4 citation statements)

References 21 publications

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“…4 One principle when generating electricity by neutralizing sodium atoms is prevention of backpressure buildup (concentration losses) at the BASE/cathode interface. Currently, sodium atoms do not move easily either into or out of b-alumina at temperatures below 750 K. 5,6 The operating design and desirable operating temperatures of the AMTEC system were 900 K to 1300 K in the evaporator section and 600 K in the condenser section. The AMTEC system operates at efficiency of over 20%.…”

Section: Anmentioning

confidence: 99%

“…The AMTEC system operates at efficiency of over 20%. 7 Wu et al 5 established an axisymmetric invariable temperature phase change interface model of a porous evaporator wick based on an AMTEC. Previously, Rhi et al 8 presented thermal modeling of an AMTEC system using an analytical one-dimensional (1-D) simulation method for a single cell.…”

Section: Anmentioning

confidence: 99%

“…As shown in Table I, a number of mathematical models for calculating the effective thermal conductivity between the internal fluid and the porous material have been studied. 5,8 It is practical to specify an effective thermal conductivity for the porous media of the AMTEC, if the convective heat transfer is negligible inside the wick. 13 The serial and parallel models define the range of effective thermal conductivities, such as lower and upper bounds, respectively, regardless of two-phase materials.…”

Section: Structure Schematic Expressionmentioning

confidence: 99%

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Study on the Characteristics of an Alkali-Metal Thermoelectric Power Generation System

Lee

Hwang

Lee

et al. 2015

Journal of Elec Materi

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In the present study, a numerical simulation and experimental studies of an alkali-metal thermoelectric energy converter (AMTEC) system were carried out. The present, unique AMTEC model consists of an evaporator, a b-alumina solid electrolyte (BASE) tube, a condenser, and an artery cable wick. The key points for operation of the present AMTEC were 1100 K in the evaporator and 600 K in the condenser. A numerical model based on sodium-saturated porous wicks was developed and shown to be able to simulate the AMTEC system. The simulation results show that the AMTEC system can generate up to 100 W with a given design. The AMTEC system developed in the present work and used in the practical investigations could generate an electromotive force of 7 V. Artery wick and evaporator wick structures were simulated for the optimum design. Both sodium-saturated wicks were affected by numerous variables, such as the input heat power, cooling temperature, sodium mass flow rate, and capillary-driven fluid flow. Based on an effective thermal conductivity model, the presented simulation could successfully predict the system performance. Based on the numerical simulation, the AMTEC system operates with efficiency near 10% to 15%. In the case of an improved BASE design, the system could reach efficiency of over 30%. The system was designed for 0.6 V power, 25 A current, and 100 W power input. In addition, in this study, the temperature effects in each part of the AMTEC system were analyzed using a heat transfer model in porous media to apply to the computational fluid dynamics at a predetermined temperature condition for the design of a 100-W AMTEC prototype. It was found that a current density of 0.5 A/cm 2 to 0.9 A/cm 2 for the BASE is suitable when the temperatures of the evaporator section and condenser section are 1100 K and 600 K, respectively.

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Section: Anmentioning

confidence: 99%

Section: Anmentioning

confidence: 99%

Section: Structure Schematic Expressionmentioning

confidence: 99%

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Study on the Characteristics of an Alkali-Metal Thermoelectric Power Generation System

Lee

Hwang

Lee

et al. 2015

Journal of Elec Materi

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“…The authors once did a thorough review of the state of the art in the research and development of the AMTEC [2]. It was revealed that, the researches about AMTEC mainly focus on its overall performance test and optimization [4,5], application fields [6], material and structure design [7,8], numerical simulation of flow and thermal performance, heat loss, as well as the heat and mass transfer characteristics of capillary evaporator [9,10]. Comparatively speaking, little attention has paid to the porous wick condenser.…”

Section: Introductionmentioning

confidence: 99%

Condensation heat transfer characteristics of the alkali metal thermal to electric converter (AMTEC) porous wick condenser

Xiao

Deng

et al. 2019

THERM SCI

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An axisymmetric 2-D mathematical model was established and the volume of fluid +method was adopted to numerically investigate the condensation heat transfer process of alkali metal in the alkali metal thermal to electric converter (AMTEC) porous wick condenser. The steady-state physical fields of working medium were obtained and the impacts of some relevant parameters including geometrical and operational parameters on condensation heat transfer characteristics were discussed. The results show that the thickness of the liquid sodium increases along the radial direction. The temperature distribution in liquid phase is approximately linear. The condensation rate at the phasechange interface decreases along the radial direction, and the cold end heat flux, q, increases initially and then decreases along the radial direction. The porous wick condenser has very limited self-adaptive ability once the mass flow rate, M , exceeds in some critical value. In addition, there is a corresponding T for a certain M to ensure the w in stable phase-change interface. The performance of AMTEC can be enhanced by reducing the distance between artery and cell wall.

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Effects of thermal shock fatigue on short glass fiber-reinforced PBT composites embedded by thermally conductive particles

Kim

Choi

2015

J Mech Sci Technol

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Parametric study on flow and heat transfer characteristics of porous wick evaporator based on AMTEC

Cited by 8 publications

References 21 publications

Study on the Characteristics of an Alkali-Metal Thermoelectric Power Generation System

Study on the Characteristics of an Alkali-Metal Thermoelectric Power Generation System

Condensation heat transfer characteristics of the alkali metal thermal to electric converter (AMTEC) porous wick condenser

Effects of thermal shock fatigue on short glass fiber-reinforced PBT composites embedded by thermally conductive particles

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