Measurement and prediction on thermal conductivity of fused quartz

Zhang, Xin Rui; Kong, Gangqiang; Wang, Le Hua; Xu, Xiaolong

doi:10.1038/s41598-020-62299-y

Cited by 11 publications

(1 citation statement)

References 28 publications

(37 reference statements)

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“…. Previous studies found that the particle size could greatly influence the thermal conductivity of sands (Lee et al 2015;Xiao et al 2019c;Zhang et al 2019;Zhang et al 2020).…”

Section: Predictions Of Thermal Conductivitymentioning

confidence: 99%

Thermal Conductivity of Biocemented Graded Sands

Xiao

Tang

et al. 2021

J. Geotech. Geoenviron. Eng.

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This paper includes an investigation of the thermal conductivity of biocemented soils to better understanding the regimes of heat transmission through soils treated by microbially induced calcium carbonate precipitation (MICP). A series of thermal conductivity tests using the transient plane source method (TPS) were performed on biocemented silica sand specimens with different gradations, void ratios, and MICP treatment cycles. The results showed that MICP treatment greatly improved the thermal conductivity of sand specimens. An increase in uniformity coefficient or a decrease in void ratio of the sand resulted in an increase in the thermal conductivity of MICP-treated specimens for a given MICP treatment cycle. The increment of thermal conductivity of MICP-treated specimens with respect to that of untreated specimens was also affected by gradation, void ratio and content of calcium carbonate. The greatest improvements in thermal conductivity were achieved for sands having an initial degree of saturation between 0.82 and 0.85. An empirical equation was established to predict the thermal conductivity of MICP-treated silica sand with different variables which may be useful in designing energy piles in biocemented sand layers.

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“…. Previous studies found that the particle size could greatly influence the thermal conductivity of sands (Lee et al 2015;Xiao et al 2019c;Zhang et al 2019;Zhang et al 2020).…”

Section: Predictions Of Thermal Conductivitymentioning

confidence: 99%

Thermal Conductivity of Biocemented Graded Sands

Xiao

Tang

et al. 2021

J. Geotech. Geoenviron. Eng.

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Interface Shape under the Insulating Baffle in Vertical Bridgman Systems

Dropka

Ostrogorsky

2022

Crystal Research and Technology

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In the vertical Bridgman (VB) configuration, the shape of the solid–liquid (s/l) interface controls the yield and quality of single crystals. The two key effects for growing CdTe in VB configuration with the baffle is are considered: i) the thermal conductivity of the baffle and 2) baffle/crystal rotation. The baffle has a dominating effect on heat transfer to the s/l interface. The low thermal conductivity baffle (λ = 0.3 W m‐K−1) shields the s/l interface from the hot zones of the furnace above the baffle, so that the furnace temperature has to be increased, thus enforcing convex interface. The insulating baffle is expected to be particularly useful for growth of low conductivity crystals such as CdTe or CZT because heat conduction through the crystal is slow. The flow driven by the rotating crystal (i.e., ampoule) makes the interface less convex. By rotating the crystal relative to the baffle, the undesirable, unsteady natural convection can be made negligible compared to forced convection, thus providing steady laminar flow at the s/l interface.

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Programmable Self‐Regulation with Wrinkled Hydrogels and Plasmonic Nanoparticle Lattices

Lee

Mousavikhamene

Amrithanath

et al. 2021

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This paper describes a self‐regulating system that combines wrinkle‐patterned hydrogels with plasmonic nanoparticle (NP) lattices. In the feedback loop, the wrinkle patterns flatten in response to moisture, which then allows light to reach the NP lattice on the bottom layer. Upon light absorption, the NP lattice produces a photothermal effect that dries the hydrogel, and the system then returns to the initial wrinkled configuration. The timescale of this regulatory cycle can be programmed by tuning the degree of photothermal heating by NP size and substrate material. Time‐dependent finite element analysis reveals the thermal and mechanical mechanisms of wrinkle formation. This self‐regulating system couples morphological, optical, and thermo‐mechanical properties of different materials components and offers promising design principles for future smart systems.

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Measurement and prediction on thermal conductivity of fused quartz

Cited by 11 publications

References 28 publications

Thermal Conductivity of Biocemented Graded Sands

Thermal Conductivity of Biocemented Graded Sands

Interface Shape under the Insulating Baffle in Vertical Bridgman Systems

Programmable Self‐Regulation with Wrinkled Hydrogels and Plasmonic Nanoparticle Lattices

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