scholarly journals The effect of adsorption-induced swelling on porosity based on the transient coal swelling model

AIP Advances ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 035229 ◽  
Author(s):  
Bo Zhang ◽  
Jie Zhu ◽  
Di Tang ◽  
Yaodong Jiang
Keyword(s):  
Coal Swelling ◽  
Swelling Model

A process-based coal swelling model: Bridging the gaps between localized swelling and bulk swelling

Fuel ◽  
2021 ◽  
Vol 293 ◽  
pp. 120360
Author(s):  
Jie Zeng ◽  
Jishan Liu ◽  
Wai Li ◽  
Jianchun Guo
Keyword(s):  
Coal Swelling ◽  
Swelling Model

Coal Swelling Model for High Heating Rate Pyrolysis Applications

2011 ◽  
Vol 25 (5) ◽  
pp. 2163-2173 ◽  
Author(s):  
Randy C. Shurtz ◽  
Kolbein K. Kolste ◽  
Thomas H. Fletcher
Keyword(s):  
Heating Rate ◽  
High Heating Rate ◽  
Coal Swelling ◽  
High Heating ◽  
Swelling Model

Coal Swelling Model for Pressurized High Particle Heating Rate Pyrolysis Applications

2012 ◽  
Vol 26 (6) ◽  
pp. 3612-3627 ◽  
Author(s):  
Randy C. Shurtz ◽  
Joseph W. Hogge ◽  
Kade C. Fowers ◽  
Gregory S. Sorensen ◽  
Thomas H. Fletcher
Keyword(s):  
Heating Rate ◽  
High Particle ◽  
Coal Swelling ◽  
Particle Heating ◽  
Swelling Model

Grain Subdivision Fission Gas Swelling Model for UO2

MRS Advances ◽  
2016 ◽  
Vol 1 (35) ◽  
pp. 2465-2470
Author(s):  
Thomas Winter ◽  
Richard Hoffman ◽  
Chaitanya S. Deo
Keyword(s):  
Grain Size ◽  
Grain Boundaries ◽  
Gas Diffusion ◽  
Fine Grain ◽  
Fuel Pellets ◽  
Model And Simulation ◽  
Nucleation Sites ◽  
Fission Gas ◽  
High Burnup ◽  
Swelling Model

ABSTRACTUnder high burnup UO2 fuel pellets can experience high burnup structure (HBS) at the rim also known as rim effect. The HBS is exceptionally porous with fine grain sizes. HBS increases the swelling further than it would have achieved at a larger grain size. A theoretical swelling model is used in conjunction with a grain subdivision simulation to calculate the swelling of UO2. In UO2 the nucleation sites are at vacancies and the bubbles are concentrated at grain boundaries. Vacancies are created due to irradiation and gas diffusion is dependent on vacancy migration. In addition to intragranular bubbles, there are intergranular bubbles at the grain boundaries. Over time as intragranular bubbles and gas atoms accumulate on the grain boundaries, the intergranular bubbles grow and cover the grain faces. Eventually they grow into voids and interconnect along the grain boundaries, which can lead to fission gas release when the interconnection reaches the surface. This is known as the saturation point. While the swelling model used does not originally incorporate a changing grain size, the simulation allows for more accurate swelling calculations by introducing a fractional HBS based on the temperature and burnup of the pellet. The fractional HBS is introduced with a varying grain size. Our simulations determine the level of swelling and saturation as a function of burnup by combining an independent model and simulation to obtain a more comprehensive model.

scholarly journals Study on swelling model and thermodynamic structure of native konjac glucomannan

2009 ◽  
Vol 10 (4) ◽  
pp. 273-279 ◽  
Author(s):  
Long Li ◽  
Hui Ruan ◽  
Liu-liu Ma ◽  
Wei Wang ◽  
Ping Zhou ◽  
...  
Keyword(s):  
Konjac Glucomannan ◽  
Thermodynamic Structure ◽  
Swelling Model

Methane adsorption-induced coal swelling measured with an optical method

2015 ◽  
Vol 25 (6) ◽  
pp. 949-953 ◽  
Author(s):  
Shuheng Tang ◽  
Yi Wan ◽  
Lijiang Duan ◽  
Zhaohui Xia ◽  
Songhang Zhang
Keyword(s):  
Optical Method ◽  
Methane Adsorption ◽  
Coal Swelling

Equivalent Mixed “PHETS” and “MPHETS” Poroelasttc-Transport-Swelling Finite Element Models for Soft Biological Tissues

1999 ◽  
Author(s):  
B. R. Simon ◽  
S. K. Williams ◽  
J. Liu ◽  
J. W. Nichol ◽  
P. H. Rigby ◽  
...  
Keyword(s):  
Finite Element ◽  
Chemical Potential ◽  
Biological Tissues ◽  
Finite Element Models ◽  
Material Interfaces ◽  
Soft Biological Tissues ◽  
Fibrous Matrix ◽  
Charged Species ◽  
Pressure Fields ◽  
Swelling Model

Abstract A soft hydrated tissue structure can be viewed as a “PETS” (poroelastic-transport-swelling) model, i.e., as a continuum composed of an incompressible porous solid (fibrous matrix with fixed charge density, FCD) that is saturated by a mobile incompressible fluid (water) containing mobile positively (p) and negatively (m) charged species. Previously, we described two PETS models — a “semi-mixed” porohyperelastic PHETS model (Simon et al. 1998) and a “fully mixed” MPHETS model (Simon et al. 1999) using FEMs (finite element models) that included geometric and material nonlinearity and coupled electrical/chemical/mechanical transport of the fluid and charged species. Here, we demonstrate the equivalence of the PHETS and MPHETS formulations that are useful when the solid and fluid materials are incompressible and the electrical-chemical potential and mechanical-osmotic pressure fields are discontinuous at material interfaces.

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