Experimental investigation of effective thermal conductivity of packed lithium-titanate pebble bed with external heat source and flow of helium

Mandal, D.; Kulkarni, N.; Gosavi, S.; Mathpati, Channamallikarjun S.

doi:10.1016/j.fusengdes.2016.12.035

Cited by 22 publications

(13 citation statements)

References 12 publications

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“…The

k_{eff}

was decreased by 13% to 15% when the temperature was increased from 423.15 to 723.15 K. Similar trend was observed for all air flow rate as shown in Figure 3. Results are in good agreement with the results obtained by various researchers earlier 17,24 …”

Section: Resultssupporting

confidence: 92%

“…Each thermowell consisted of four thermocouples at different radial distances. The type as well as axial and radial locations of the thermowell were exactly similar to the one used in previous study 17 . Two programmable logic controller‐based controller modules were installed for data acquisition and storage.…”

Section: Methodsmentioning

confidence: 99%

“…Till recent times, many researchers have worked on the modeling and calculation of effective thermal conductivity of ceramic breeder packed bed 8‐15 . Mandal et al calculated the effective thermal conductivity of the packed

{Li}_{2} {TiO}_{3}

pebble bed with the external heating system 16,17 . Effective thermal conductivity was calculated by hot wire heating method in some studies.…”

Section: Introductionmentioning

confidence: 99%

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Modeling and validation of heat transfer in packed bed with internal heat generation

et al. 2020

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Several researchers have modeled the heat transfer in a packed bed, heated externally, and determined its effective thermal conductivity (keff). But till date, very few researchers have studied the heat transfer of the pebble bed, where the heat is generated inside the bed; and the effective thermal conductivity of the packed bed with internal heat generation has not yet been reported. In the present work, heat generation inside the bed has been imitated by inductively heating randomly placed steel balls with lithium titanate (Li2TiO3) pebbles. The system has been modeled and validated with experimental results. The keff of the Li2TiO3 pebble bed is determined for various process conditions. A correlation has been developed to calculate the keff based on various process parameters such as pebble diameter, air flow rate, and induction temperature. The result presented in this study will be used for the design and scale‐up studies of future fusion reactors.

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“…The

k_{eff}

Section: Resultssupporting

confidence: 92%

Section: Methodsmentioning

confidence: 99%

{Li}_{2} {TiO}_{3}

pebble bed with the external heating system 16,17 . Effective thermal conductivity was calculated by hot wire heating method in some studies.…”

Section: Introductionmentioning

confidence: 99%

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Modeling and validation of heat transfer in packed bed with internal heat generation

et al. 2020

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“…Mandal et al developed a test facility with external heat generation to measure pebble bed ETC, using the air and helium as fluid medium respectively (Figure 23). 17,90 If the fluid velocity remained the same, the Li 2 TiO 3 pebble bed ETC increased with the larger pebble diameter (see Figure 24). In another Li 2 TiO 3 ETC measurement experiment with stagnant air at 30°C, the ETC showed a similar trend with the increasing pebble diameter of the unary packed pebble bed.…”

Section: Effective Thermal Conductivity Of the Pebble Bedmentioning

confidence: 99%

“…Helium is produced in the fusion blankets. The tritium and thermal energy is taken away by the flowing helium 90‐93 …”

Section: Effective Thermal Conductivity Of the Pebble Bedmentioning

confidence: 99%

Review of the experimental research on the thermal‐hydraulic characteristics in the pebble bed nuclear reactor core and fusion breeder blankets

et al. 2020

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Summary Merits in the inherent safety characteristics and multiple applications, cause the pebble‐bed‐type nuclear reactors, including the High‐Temperature Gas‐cooled Reactors, Fluoride‐salt‐cooled High‐temperature Reactors and Water‐cooled Pebble‐bed Reactors, to gain more focus in recent years. Thermal‐hydraulic characteristics in the pebble bed reactor core are of great significance to the safety evaluation and design of such reactors. Experimental investigations on the thermal‐hydraulics of different fluids in the pebble‐bed‐type of nuclear reactor core have been reviewed in this paper. Main experimental methods to determine the flow regime transition, convective heat transfer coefficients, and effective thermal conductivity have been summarized, with the merits and disadvantages discussed. Discussions are given on the main factors that can influence the flow, convective heat transfer and effective thermal conductivity in the pebble bed.

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A process for fabrication of Li2TiO3 ceramic pebbles with high mechanical properties via non-hydrolytic sol-gel method

Tan

Wang

et al. 2020

Ceramics International

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Experimental investigation of effective thermal conductivity of packed lithium-titanate pebble bed with external heat source and flow of helium

Cited by 22 publications

References 12 publications

Modeling and validation of heat transfer in packed bed with internal heat generation

Modeling and validation of heat transfer in packed bed with internal heat generation

Review of the experimental research on the thermal‐hydraulic characteristics in the pebble bed nuclear reactor core and fusion breeder blankets

A process for fabrication of Li2TiO3 ceramic pebbles with high mechanical properties via non-hydrolytic sol-gel method

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