Prandtl Number in Classical Hard-Sphere and One-Component Plasma Fluids

Khrapak, S. A.; Khrapak, A. G.

doi:10.3390/molecules26040821

Cited by 7 publications

(2 citation statements)

References 49 publications

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“…There are known methods of measuring the thermal resistance of the Rthj-c junction case [26]. Additionally, applications of the Cauer [27] and Foster [28] methods are known for modeling the heat flow path on the junctioncase route. Fourier transform was also used to simplify the equations [29].…”

Section: Introductionmentioning

confidence: 99%

Indirect Thermographic Temperature Measurement of a Power-Rectifying Diode Die

et al. 2022

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This article concerns the indirect thermographic temperature measurement of a die of the semiconductor diode D00-250-10. The article shows how the goal was achieved. The methodology of selecting the point at which thermographic measurements of the temperature of the diode cases were performed is discussed. The method of thermographic measurement of the case temperature and the measuring system used is described. The method of simulations making it possible to obtain the die’s temperature on the basis of thermographic casing temperature measurement is presented. In order to enable a better understanding of the discussed issues, the construction of the diode used and the heat flow equation are described. As a result of the work carried out, the point at which the temperature is closest to the die temperature was indicated on the diode case. It is shown that the difference between the casing temperature and the die temperature does not exceed 2 °C at the point indicated. An indirect measurement of the die’s temperature is carried out for different values of the power dissipated on the die.

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Section: Introductionmentioning

confidence: 99%

Indirect Thermographic Temperature Measurement of a Power-Rectifying Diode Die

et al. 2022

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“…The specific heat of Ar and Xe was assumed to be 523 J/kg K and 158 J/kg K respectively. A Prandtl number of 1 was assumed: this has been shown to be an appropriate order of magnitude for single-species plasma [162] and a value of 1 has previously been used when modelling an argon plasma torch [163]. A temperature and gas species independent viscosity of µ=10 −4 was used throughout these results.…”

Section: Propellant Gas Injectionmentioning

confidence: 99%

A Central-Cathode Electrostatic Thruster Featuring a High-Temperature Superconducting Applied Field Module

Acheson

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In recent decades, advances in electric propulsion have enabled the development of novel mission designs for space exploration. However, future deep space mission payloads of unprecedented mass will require advances in high thrust, high specific impulse propulsion. To achieve higher thrust density than traditional ion thrusters or Hall effect thrusters, novel designs for central-cathode electrostatic thrusters (CC-ESTs) and applied field magnetoplasmadynamic thrusters incorporate an applied magnetic field module which is used to accelerate plasma. The high thrust density of such designs makes them suitable candidates for further research and development for space deployment.Crucial performance metrics of such thrusters have been shown to increase as the applied magnetic field increases, and high temperature superconducting (HTS) magnets show promise as low-power, high applied field modules. Both the strength and the profile of the applied magnetic field are closely tied to thruster performance. This raises the question- which magnetic fields improve thruster performance and why?In this thesis, the impact of the magnetic field strength and profile on the performance of a plasma thruster is investigated. Numerical modelling of a central-cathode electrostatic thruster (CC-EST) was performed with particular regard to the detachment of plasma from magnetic field lines. This modelling was conducted alongside an experimental campaign to manufacture and integrate a high temperature superconducting applied field module with a CC-EST to characterise the HTS CC-EST performance. CC-EST performance was measured at central bore fields exceeding 1 T and with two different magnetic field profiles. These efforts have led to a novel understanding of the scaling of performance parameters in CC-EST with magnetic field, and how the performance of the thruster might be tailored to a specific application.

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