Evaluation of the fused silica thermal conductivity by comparing infrared thermometry measurements with two-dimensional simulations

Combis, P.; Cormont, Philippe; Gallais, Laurent; Hebert, David G.; Robin, Lucile; Rullier, Jean-Luc

doi:10.1063/1.4764904

Cited by 67 publications

(27 citation statements)

References 14 publications

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“…Each micro-capillary was 6.5 cm in length, 200 μm in inner diameter, and 2 μl in capacity. Polyimide has a thermal conductivity about 6.5 times less than the fused silica (fused silica ~1.35 Wm −1 K −1 [6]; polyimide ~0.2 Wm −1 K −1 [20,23]). Heo et al [13] have successfully used fused silica capillary tubes, after removing the polyimide coat, in which to vitrify a variety of cell types.…”

Section: Methodsmentioning

confidence: 99%

Cryopreservation of human spermatozoa with minimal non-permeable cryoprotectant

et al. 2016

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Cryopreservation of human spermatozoa is a commonly used technique in assisted reproduction, however freezing low concentrations of sperm while maintaining adequate post-thaw motility remains a challenge. In an effort to optimize post-thaw motility yields, low volumes of human sperm were frozen in polyimide-coated fused silica micro-capillaries using 0.065 M, 0.125 M, 0.25 M, or 0.5 M trehalose as the only cryoprotectant. Micro-capillaries were either initially incubated in liquid nitrogen vapor before plunging into liquid nitrogen, or directly plunged into liquid nitrogen. Post thaw sperm counts and motility were estimated. Spermatozoa that were initially incubated in liquid nitrogen vapor had greater post thaw motility than those plunged immediately into liquid nitrogen independent of trehalose concentration. The protective effect of 0.125 M D-glucose, 3-O-methyl-D-glucopyranose, trehalose, sucrose, raffinose, or stachyose were evaluated individually. Trehalose and sucrose were the most effective cryoprotectants, recovering 69.0% and 68.9% of initial sperm motility, respectively.

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Section: Methodsmentioning

confidence: 99%

Cryopreservation of human spermatozoa with minimal non-permeable cryoprotectant

et al. 2016

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“…8, (Z'T) of 100 nm thick CuCrO 2 :Mg films is plotted as a function of the temperature compared with the data from the literature. The values of the modified ZT are calculated using the measured Seebeck coefficient and the electrical conductivity as a function of the temperature (from 40 to 210°C) published in our previous work 13 and the temperature dependent thermal conductivity of the fused silica published by Combis et al 24 Thanks to the thermal properties of the CuCrO 2 :Mg film, (Z'T) attained 2 × 10 −2 at 210°C, whereas CuCrO 2 :Mg bulk studied by Hayashi et al 26 reached only 0.008 at the equivalent temperature. Pérez-Rivero et al 17 published a Z'T of 7 × 10 −3 at 180°C in the case Ca 3 Co 4 O 9 epitaxial thin film on yttria stabilized zirconia crystalline substrate.…”

Section: Resultsmentioning

confidence: 99%

“…In the same way, the thermal conductivity of the substrate is obtained from Ref. 24 (1.38 W m −1 K −1 ) at room temperature and does not vary a lot till 250°C. Concerning the thermal conductivity, CuCrO 2 bulk is reported to have a value of 8 W m −1 K −1 at 300 K. 25 In order to broaden the scope of the study, parameters such as the thermal conductivity, the thickness, and the emissivity of the film are varied in a wide range.…”

Section: Experimental Determination Of the Physical Propertiesmentioning

confidence: 98%

Determination of modified figure of merit validity for thermoelectric thin films with heat transfer model: Case of CuCrO2:Mg deposited on fused silica

Sinnarasa

Thimont

Presmanes

et al. 2018

Journal of Applied Physics

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Thermoelectric performance of a material is determined using a figure of merit (FOM) determined as ZT (ZT = σS2T/κ where σ is the electrical conductivity, S is the Seebeck coefficient, κ is the thermal conductivity, and T is the temperature). In the case of a thin film, it is normal in the first approach to consider calculating the FOM by using the thermal conductivity of the film. However, both the thermal influence of the substrate and the emissivity of the film must also be taken into account. In the present work, the heat transfer model is used in order to study the influence of the thermal conductivity, the thickness, and the emissivity of the film on the thermal gradient of the stack (substrate + thin film). The limits of these three parameters are determined in order to have the temperature variation due to the presence of the film compared to the substrate alone that remains less than 1%. Under these limits, the thermal conductivity of the substrate can be taken into account instead of the thermal conductivity of the thin film, and a modified FOM (Z’T) can be calculated. The present study leads to the determination of the validity of modified ZT. In the case of CuCrO2:Mg thin films, the model shows that the use of Z’T is valid. The calculated value of Z’T with the measured Seebeck coefficient and the electrical conductivity as a function of the temperature for 100 nm thick films and the temperature dependent thermal conductivity taken from the literature reached 0.02 at 210 °C. A thermoelectric module made with this material showed 10.6 nW when 220 °C is applied at the hot side.

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“…Such data is generally not provided by the quartz manufacturers. In a recent study [40], this dependency with temperature has been characterized based on data from the manufacturer Heraeus [5]. The data are reported in Fig.…”

Section: Conductive Transfer Modeling Quartz Thermal Conductivitymentioning

confidence: 99%

Assessment of External Heat Transfer Modeling of a Laboratory-Scale Combustor: Effects of Pressure-Housing Environment and Semi-Transparent Viewing Windows

Rodrigues

Gicquel

Darabiha

et al. 2018

Journal of Engineering for Gas Turbines and Power

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Many laboratory-scale combustors are equipped with viewing windows to allow for characterization of the reactive flow. Additionally, pressure housing is used in this configuration to study confined pressurized flames. Since the flame characteristics are influenced by heat losses, the prediction of wall temperature fields becomes increasingly necessary to account for conjugate heat transfer (CHT) in simulations of reactive flows. For configurations similar to this one, the pressure housing makes the use of such computations difficult in the whole system. It is, therefore, more appropriate to model the external heat transfer beyond the first set of quartz windows. The present study deals with the derivation of such a model, which accounts for convective heat transfer from quartz windows external face cooling system, free convection on the quartz windows 2, quartz windows radiative properties, radiative transfer inside the pressure housing, and heat conduction through the quartz window. The presence of semi-transparent viewing windows demands additional care in describing its effects in combustor heat transfers. Because this presence is not an issue in industrial-scale combustors with opaque enclosures, it remains hitherto unaddressed in laboratory-scale combustors. After validating the model for the selected setup, the sensitivity of several modeling choices is computed. This enables a simpler expression of the external heat transfer model that can be easily implemented in coupled simulations.

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Evaluation of the fused silica thermal conductivity by comparing infrared thermometry measurements with two-dimensional simulations

Cited by 67 publications

References 14 publications

Cryopreservation of human spermatozoa with minimal non-permeable cryoprotectant

Cryopreservation of human spermatozoa with minimal non-permeable cryoprotectant

Determination of modified figure of merit validity for thermoelectric thin films with heat transfer model: Case of CuCrO2:Mg deposited on fused silica

Assessment of External Heat Transfer Modeling of a Laboratory-Scale Combustor: Effects of Pressure-Housing Environment and Semi-Transparent Viewing Windows

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