Some aspects of heat transfer between a vertical wall and a gas fluidized bed

Baeyens, Jan; Goossens, W.R.A.

doi:10.1016/0032-5910(73)80067-1

Cited by 19 publications

(6 citation statements)

References 11 publications

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“…As shown in Fig. 3, sheathed K thermocouples measure the air and solid temperature as demonstrated by Baeyens and Goossens (1973). Along the suspension path, the particle temperature is measured by thermocouples placed at the tube inlet in the DiFB, and at the inlet and outlet of the high flux exposed part of the absorber tube, at the tube center and at 5 mm from the internal wall.…”

Section: Pressure and Temperature Sensorsmentioning

confidence: 99%

On-sun demonstration of a 750 °C heat transfer fluid for concentrating solar systems: Dense particle suspension in tube

et al. 2015

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Section: Pressure and Temperature Sensorsmentioning

confidence: 99%

On-sun demonstration of a 750 °C heat transfer fluid for concentrating solar systems: Dense particle suspension in tube

et al. 2015

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“…To address this limitation, a time-independent contact resistance was introduced in a study by Baskakov et al 99 It was later adapted in a study by Baeyens and Geldart. 98,100 An input for the packet renewal model is the thermal conductivity of the emulsion phase, estimated by measuring temperature at different locations of the bed. The measurement is difficult to undertake when the thermal gradient in the bulk of the bed is low, relatively small heat fluxes are used, or when large temperature fluctuations are present in the bed.…”

Section: General Heat Transfer In Fluidizedmentioning

confidence: 99%

“…The measurement is difficult to undertake when the thermal gradient in the bulk of the bed is low, relatively small heat fluxes are used, or when large temperature fluctuations are present in the bed. 100 Models were proposed in a study by Zehner and Schlunder to separate the overall bulk thermal conductivity into thermal conductivities of the gas phase and the solids phase. 94,101 The equation for gas phase thermal conductivity was adapted in a study by Kuiper et al 97 Solids conductivity, which is a function of their heat capacity, density, particle size and granular temperature, was described in a study by Natarajan and Hunt.…”

Section: General Heat Transfer In Fluidizedmentioning

confidence: 99%

“…There are two common approaches for predicting heat transfer in a bubbling fluidized bed, (a) the packet renewal model, and (b) the two-fluid model (TFM). , For the packet renewal model, Mickley and Fairbanks postulated that the heat transfer occurs by packets of emulsion phase that are periodically replaced from the heat-transfer surface by bubbles. , The packet renewal model is not appropriate when heat penetration to the packet is low and packet residence time is short. To address this limitation, a time-independent contact resistance was introduced in a study by Baskakov et al It was later adapted in a study by Baeyens and Geldart. , An input for the packet renewal model is the thermal conductivity of the emulsion phase, estimated by measuring temperature at different locations of the bed. The measurement is difficult to undertake when the thermal gradient in the bulk of the bed is low, relatively small heat fluxes are used, or when large temperature fluctuations are present in the bed .…”

Section: Heat Transfer and Electric Heating Principlesmentioning

confidence: 99%

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Electrically Heated Fluidized Beds─A Review

Ahmed,

Duchesne,

Tan

et al. 2024

Ind. Eng. Chem. Res.

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Fluidized beds heated via fossil fuel combustion have been widely used in industry for various applications. Heating these fluidized beds with clean electricity is emerging as a promising solution to reduce greenhouse gas emissions, improve overall energy efficiency, and for some applications, improve product quality. This review covers the development status of electrically heated fluidized beds (EHFBs) with a variety of heating principles, including Joule heating, induction heating, electromagnetic irradiation, sonication, plasma heating and gas preheating. An analysis of the advantages and disadvantages of these heating principles is presented, along with their suitability for different applications. Current and potential industrial applications using EHFBs for highly diversified processes, from material processing and biomass gasification to space exploration, are highlighted. Each application presents its own unique opportunities and challenges. The selection of a method to deliver electrical heat depends on the specific purpose of each application, materials involved, and the required configuration of the EHFB. Hence, methods to assess key performance indicators are described. To date, only a few applications have been commercialized, mostly for drying and material processing. Recommendations for EHFB advancement are provided so that their full potential can be realized.

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“…It must be noted that, in DPS, the gas and solid have the same temperature [18]. The temperature at the inlet of the irradiated cavity in the center of the tube Ti,center was overestimated by simulations.…”

Section: Comparison Between Simulations and Experimentsmentioning

confidence: 99%

Three‐dimensional numerical simulation of upflow bubbling fluidized bed in opaque tube under high flux solar heating

et al. 2018

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in: http://oatao. • C. We proposed to use air-fluidized Dense Particle Suspensions (DPS), also called Upflow Bubbling Fluidized Bed (UBFB), in tubes as a new HTF and storage medium in the frame of the so-called CSP2 FP7 European project. UBFB can operate up to the solid sintering temperature (1400• C for SiC particles), thus improving the plant efficiency and cost of produced kWh. The DPS capacity to extract heat from a tube absorber exposed to concentrated solar radiation was demonstrated and the first values of the tube wall-to-DPS heat transfer coefficient were measured. A stable outlet temperature of 750• C was reached with a metallic tube, and a particle reflux in the near tube wall region was evidenced. In this paper, the UBFB behavior is studied using the multiphase flow code NEPTUNE_CFD. Hydrodynamics of SiC Geldart A-type particles and heat transfer imposed by a thermal flux at the wall are coupled in 3D numerical simulations. The convective/diffusive heat transfer between the gas and dispersed phase, and the inter-particle radiative transfer (Rosseland approximation) are accounted for. Simulations and experiments are compared. The temperature influence on the DPS flow is analyzed.

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Some aspects of heat transfer between a vertical wall and a gas fluidized bed

Cited by 19 publications

References 11 publications

On-sun demonstration of a 750 °C heat transfer fluid for concentrating solar systems: Dense particle suspension in tube

On-sun demonstration of a 750 °C heat transfer fluid for concentrating solar systems: Dense particle suspension in tube

Electrically Heated Fluidized Beds─A Review

Three‐dimensional numerical simulation of upflow bubbling fluidized bed in opaque tube under high flux solar heating

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