Measurement of thermal diffusivity for carbon dioxide (CO2) at T = 293.15–406.15 K and pressures up to 11 MPa by dynamic light scattering (DLS)

Zhang, Ying; Chen, Yutian; Zhan, Taotao; Zheng, Yu; Xiong, Zheng; He, Maogang

doi:10.1016/j.fluid.2018.07.012

Cited by 8 publications

(2 citation statements)

References 24 publications

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“…DLS is considered to be an effective experimental method for measuring the thermal diffusivity of fluids which can achieve an absolute measurement over a wide range of thermodynamic states. Previously, our group has investigated the thermal diffusivity of various liquids, such as ETBE, and carbon dioxide . This paper aimed to measure the thermal diffusivity of n -pentane in the temperature range from 293.15 to 573.15 K along six isobaric lines at p = (0.1, 3.0, 3.5, 5.0, 7.5, and 10.0) MPa to supplement the new thermophysical property data of n -pentane, especially in the near-critical and supercritical regions.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Thermal Diffusivity of n-Pentane from (293–573) K and up to 10.0 MPa in the Near-Critical and Supercritical Regions

et al. 2021

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Transport properties of n-pentane are so scarce that it prevents the further studies of n-pentane as an important component of industrial fluids, especially in the near-critical and supercritical regions. In this work, the thermal diffusivity of n-pentane was measured by the dynamic light scattering method within the temperature limits of (293–573) K along six isobaric lines at p = (0.1, 3.0, 3.5, 5.0, 7.5, and 10.0) MPa. The relative uncertainty of the thermal diffusivity experimental system is estimated to be 2.6% for a coverage factor of k = 2 with a level of confidence of 0.95. The influences of temperature and pressure on thermal diffusivity were presented. Besides, we compared the experimental data with the calculated values from the thermal conductivity model proposed by Vassiliou et al. and the multiparameter equation of state proposed by Span and Wagner. The absolute average of relative deviation and maximum deviation between the experimental data and the calculated results are 1.12 and 3.74%, respectively.

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Section: Introductionmentioning

confidence: 99%

Measurement of Thermal Diffusivity of n-Pentane from (293–573) K and up to 10.0 MPa in the Near-Critical and Supercritical Regions

et al. 2021

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“…Parameters for the atmosphere-ocean exchange of 𝐶𝑂 2 , 𝐻 2 and 𝐶 𝐻 4 . * : 𝐶 𝐻 4 and 𝐻 2 values fromKharecha et al (2005), 𝛼: 𝐶𝑂 2 diffusivity value fromZhang et al (2018), 𝛽: 𝐶𝑂 2 solubility from https://webbook.nist.gov/chemistry/. Piston velocities are calculated assuming a stagnant boundary layer thickness of 𝑧 𝑓 𝑖𝑙𝑚 = 40𝜇𝑚.…”

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Predicting biosignatures for nutrient limited biospheres

Nicholson¹,

Daines²,

Mayne³

et al. 2022

Preprint

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With the characterisations of potentially habitable planetary atmospheres on the horizon, the search for biosignatures is set to become a major area of research in the coming decades. To understand the atmospheric characteristics that might indicate alien life we must understand the abiotic characteristics of a planet and how life interacts with its environment. In the field of biogeochemistry, sophisticated models of life-environment coupled systems demonstrate that many assumptions specific to Earth-based life, e.g. specific ATP maintenance costs, are unnecessary to accurately model a biosphere. We explore a simple model of a single-species microbial biosphere that produces 𝐶𝐻 4 as a byproduct of the microbes' energy extraction -known as a type I biosignature. We demonstrate that although significantly changing the biological parameters has a large impact on the biosphere's total population, such changes have only a minimal impact on the strength of the resulting biosignature, while the biosphere is limited by 𝐻 2 availability. We extend the model to include more accurate microbial energy harvesting and show that adjusting microbe parameters can lead to a regime change where the biosphere becomes limited by energy availability and no longer fully exploits the available 𝐻 2 , impacting the strength of the resulting biosignature. We demonstrate that, for a nutrient limited biosphere, identifying the limiting nutrient, understanding the abiotic processes that control its abundance, and determining the biospheres ability to exploit it, are more fundamental for making type I biosignature predictions than the details of the population dynamics of the biosphere.

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Dynamic Light Scattering for the Measurement of Transport Properties of Fluids

Koller,

Rausch,

Fröba

2024

Int J Thermophys

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The present article summarizes experimental and theoretical considerations required for a proper use of dynamic light scattering (DLS) for the measurement of transport properties of fluids. It addresses not only recent advancements of the method, but also aims to provide recommendations to researchers who intend to apply the technique in the future. As outlined in this study, DLS is based on the analysis of scattered light governed by microscopic statistical or periodic fluctuations that originate from the thermal movement of molecules and/or particles at macroscopic thermodynamic equilibrium. The dynamics of these hydrodynamic fluctuations in the bulk of fluids or at their phase boundaries are related to the underlying diffusive processes and, thus, to the associated transport properties, and are reflected by the time-dependent correlation function of the scattered light intensity. The fundamentals of this type of detection, known as photon correlation spectroscopy (PCS), will be discussed in the present contribution in some more detail. It is emphasized that the experiments need to be designed carefully in accordance with theory in order to assign the measurement signals to the corresponding hydrodynamic fluctuations. If the necessary conditions are fulfilled, DLS allows the accurate determination of several transport properties including kinematic and dynamic viscosity, thermal diffusivity, mutual diffusivity, and sound attenuation, which may be accessed together with other thermophysical properties such as speed of sound and surface or interfacial tension. In some instances, also the simultaneous determination of several transport properties is possible. With the exception of the sound attenuation, expanded uncertainties for the mentioned transport properties down to 1 % can be achieved for various types of fluid systems over a wide range of thermodynamic states up to elevated temperatures and pressures as well as in the vicinity of critical points. This performance and versatility of the DLS technique is documented in the present study by highlighting measurement examples from recent thermophysical property research on different classes of working fluids relevant for process and energy technology.

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Measurement of thermal diffusivity for carbon dioxide (CO2) at T = 293.15–406.15 K and pressures up to 11 MPa by dynamic light scattering (DLS)

Cited by 8 publications

References 24 publications

Measurement of Thermal Diffusivity of n-Pentane from (293–573) K and up to 10.0 MPa in the Near-Critical and Supercritical Regions

Measurement of Thermal Diffusivity of n-Pentane from (293–573) K and up to 10.0 MPa in the Near-Critical and Supercritical Regions

Predicting biosignatures for nutrient limited biospheres

Dynamic Light Scattering for the Measurement of Transport Properties of Fluids

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Measurement of thermal diffusivity for carbon dioxide (CO2) at T = 293.15–406.15 K and pressures up to 11 MPa by dynamic light scattering (DLS)

Cited by 8 publications

References 24 publications

Measurement of Thermal Diffusivity of n-Pentane from (293–573) K and up to 10.0 MPa in the Near-Critical and Supercritical Regions

Measurement of Thermal Diffusivity of n-Pentane from (293–573) K and up to 10.0 MPa in the Near-Critical and Supercritical Regions

Predicting biosignatures for nutrient limited biospheres

Dynamic Light Scattering for the Measurement of Transport Properties of Fluids

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Measurement of thermal diffusivity for carbon dioxide (CO2) at T = 293.15–406.15 K and pressures up to 11 MPa by dynamic light scattering (DLS)