Experimental measurement of effective thermal conductivity of packed lithium-titanate pebble bed

Mandal, D.; Sathiyamoorthy, D.; Vinjamur, Madhu

doi:10.1016/j.fusengdes.2011.09.003

Cited by 41 publications

(22 citation statements)

References 29 publications

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“…A variety of chemical methods, such as solid state reaction process, sol-gel [18], wet chemical method [19], solution combustion [20] and extrusionspheronisation-sintering method [21,22], have been tried for the synthesis of Li 2 TiO 3 , and these techniques allow the preparation of stoichiometric single-phase material after high-temperature calcination. In the present study, nanocrystalline Li 2 TiO 3 has been synthesized by high energy ball milling followed by calcinations at 700 ℃.…”

Section: mentioning

confidence: 99%

Effect of Li+ ion mobility on the grain boundary conductivity of Li2TiO3 nanoceramics

et al. 2014

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Lithium titanate (Li 2 TiO 3 ) is one of the most promising candidates among the tritium breeding materials because of its good tritium release capacity. Li concentration has much significance on the diffusivity of tritium in the material. The nanocrystalline single-phase Li 2 TiO 3 with monoclinic structure has been prepared by high energy ball milling followed by calcination at 700 ℃ for 2 h. The field emission scanning electron microscopy (FESEM) studies confirmed uniform distribution of nanocrystalline phase with particle size below 100 nm. The study of the Li + ion diffusion on the sintered sample was investigated by means of electrical conductivity measurements. Electrical properties of the samples were studied in wide temperature (50-500 ℃) and frequency (100 Hz-1 MHz) ranges. The complex impedance spectroscopy (CIS) studies showed the presence of both bulk and grain boundary effects in nanocrystalline Li 2 TiO 3 . The bulk resistance of the samples has been observed to decrease with rise in temperature showing a typical negative temperature coefficient of resistance (NTCR) behavior. The low activation energies of the samples suggested the presence of singly ionized oxygen vacancies in the conduction process. The hopping frequency shifted toward higher frequency with increase in temperature. Activation energy of 0.86 eV was calculated from AC conductivity.

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Section: mentioning

confidence: 99%

Effect of Li+ ion mobility on the grain boundary conductivity of Li2TiO3 nanoceramics

et al. 2014

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“…It was found that intensities of IR absorption spectra at 2580, 2550 and 2500 cm −1 increased by gamma-ray irradiation, which were named as Peaks A, B and C, respectively. Luo et al [6] and interstitial O D bond [11,12], respectively. These FT-IR absorption peak intensities as a function of gammaray dose were summarized in Fig.…”

Section: Methodsmentioning

confidence: 97%

“…Lithium titanate (Li 2 TiO 3 ) is one of the candidates as the tritium breeding materials in D-T fusion reactors [1][2][3][4][5][6][7]. It is well known that in an operation of fusion reactors, irradiation defects in Li 2 TiO 3 will be produced by neutrons and recoil helium and tritium [8].…”

Section: Introductionmentioning

confidence: 99%

Correlation between release of deuterium and annihilation of irradiation defects produced by gamma-ray in Li2TiO3

Toda

Kobayashi

Fujishima

et al. 2013

Fusion Engineering and Design

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“…This system, often referred to as "packed-fluidized bed" or "confined fluidized bed" [10], has been raising an increasing interest as its fluid-solid contact mode is particularly suitable for operations in which maximization of the conversion of a gaseous reactant is crucial [11][12][13]. That is due to the ability of these fluidized systems to prevent the formation of bubbles, a route by which part of the gas feed by-passes the contact with the solid phase, whether it is another reactant or a catalyst.…”

Section: Introductionmentioning

confidence: 99%

Extension of the model of binary fluidization to beds confined in a packing of coarse spheres

2016

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The prediction of the minimum fluidization velocity of beds of Geldart's group B particles confined in a packed bed of coarse spheres can be achieved by extending to this peculiar type of systems the theory developed for modelling the behaviour of segregating beds of simultaneously fluidized solids.The approach is based on separate force balances on the fluid and the fine solids, capable to account for the peculiar nature of solid-solid interaction in a confined fluidized bed. Its validation is fulfilled by an extended investigation conducted in two columns (5 and 10 cm OD) packed with a fixed bed of 4.1 mm lead shots or 11 mm glass beads. The effect of particle size on the fluidization regime is investigated by comparing the results provided by experiments in which various cuts of glass ballotini, ranging from 100 to nearly 600 µm, are fluidized in two packings of fixed spheres; possible differences of behaviour due to particle density are analysed by series of experiments employing particles of ceramics, zirconium oxide, steel and bronze of the same diameter.The results obtained confirm the effectiveness of the approach followed, in which an important role is played by the indirect interaction between the two solid phases. KEYWORDSConfined-fluidized beds; bubble-free fluidization; packed-fluidized beds; binary fluidization; solid interaction. 1.

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Experimental measurement of effective thermal conductivity of packed lithium-titanate pebble bed

Cited by 41 publications

References 29 publications

Effect of Li+ ion mobility on the grain boundary conductivity of Li2TiO3 nanoceramics

Effect of Li+ ion mobility on the grain boundary conductivity of Li2TiO3 nanoceramics

Correlation between release of deuterium and annihilation of irradiation defects produced by gamma-ray in Li2TiO3

Extension of the model of binary fluidization to beds confined in a packing of coarse spheres

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