On the Heat Flux Vector and Thermal Conductivity of Slags: A Brief Review

Massoudi, Mehrdad; Kim, Jeongho; Wang, Ping

doi:10.3390/en9010027

Cited by 6 publications

(3 citation statements)

References 70 publications

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“…Volume Porosity, VP = Volume f luid Volume f luid+solid (8) where I AD, VP, Area element , Volume f luid , and Volume f luid+solid are the interfacial area density, volume porosity, area of the solid part in the single heating element, volume of the fluid part in the single heating element, and sum of the fluid and solid volumes in the element. The friction coefficient and heat transfer coefficient vary depending on the flow, and the interfacial area density and volume porosity are values that vary depending on the shape of the element.…”

Section: Simulation Setupmentioning

confidence: 99%

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Optimization of the Heating Element in a Gas-Gas Heater Using an Integrated Analysis Model

et al. 2017

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Gas-gas heaters (GGHs) are used to reheat gases through desulfurization in coal-fired power plants to reduce low-temperature corrosion and white smoke. Wrinkled heating elements are installed inside the GGH to perform effective heat exchange. An optimization study of the heating element shape was conducted to reduce the differential pressure effectively and improve performance. An integrated analysis model was applied. Based on actual operational data, a computational fluid dynamic analysis was conducted on the L-type heating element and GGH system. The experiments applied the optimal latin hypercube sampling method, and numerical analysis was performed for each sample. Based on the response surface, the result of the sample was optimized through the pointer algorithm. For the integrated analysis model, validation was performed by comparison with the actual operational data, and the thermal-fluid characteristics of the heating element and GGH system were analyzed to set three parameters: plate angle, undulated angle, and pitch 1. From the optimization result, increases in the undulated angle and pitch 1 reduce the pressure drop by widening the heating element cross section. By increasing the plate angle, the heat transfer area is secured and the reduced heat transfer coefficient is compensated, improving the GGH performance.

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Section: Simulation Setupmentioning

confidence: 99%

“…Plugging is a kind of fouling phenomenon, which is different from the slagging caused by the deposition of ash in the boiler [8,9]. Frequent component replacement, owing to pressure drop in the GGH, is caused by plugging and fouling and makes it difficult to operate the power plant.…”

Section: Introductionmentioning

confidence: 99%

Optimization of the Heating Element in a Gas-Gas Heater Using an Integrated Analysis Model

et al. 2017

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“…All these equations make use of isotropic thermophysical scalar constants (or their anisotropic versions [ 12 ]), which are material properties: thermal conductivity, heat capacity, emissitivity, and so forth. The characterization of the thermophysical properties of the materials themselves is therefore another area where heat flux is usually analyzed and/or measured [ 13 , 14 , 15 ]. The simultaneous measurement of temperature at localized points and heat flux offer a very good description of the local thermal processes taking place in a system.…”

Section: Introductionmentioning

confidence: 99%

A Miniaturized 3D Heat Flux Sensor to Characterize Heat Transfer in Regolith of Planets and Small Bodies

Domínguez-Pumar

Rodríguez-Manfredi

Jiménez

et al. 2020

Sensors

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The objective of this work is to present the first analytical and experimental results obtained with a 3D heat flux sensor for planetary regolith. The proposed structure, a sphere divided in four sectors, is sensible to heat flow magnitude and angle. Each sector includes a platinum resistor that is used both to sense its temperature and provide heating power. By operating the sectors at constant temperature, the sensor gives a response that is proportional to the heat flux vector in the regolith. The response of the sensor is therefore independent of the thermal conductivity of the regolith. A complete analytical solution of the response of the sensor is presented. The sensor may be used to provide information on the instantaneous local thermal environment surrounding a lander in planetary exploration or in small bodies like asteroids. To the best knowledge of the authors, this is the first sensor capable of measuring local 3D heat flux.

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Computational Insight into the Thermal Conductivity of CaO-SiO2-Al2O3-MgO-Na2O Melts

Wang

Huang

Wen

et al. 2020

Metall Mater Trans B

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On the Heat Flux Vector and Thermal Conductivity of Slags: A Brief Review

Cited by 6 publications

References 70 publications

Optimization of the Heating Element in a Gas-Gas Heater Using an Integrated Analysis Model

Optimization of the Heating Element in a Gas-Gas Heater Using an Integrated Analysis Model

A Miniaturized 3D Heat Flux Sensor to Characterize Heat Transfer in Regolith of Planets and Small Bodies

Computational Insight into the Thermal Conductivity of CaO-SiO2-Al2O3-MgO-Na2O Melts

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