Gas-phase pressure and flow velocity fields inside a burning cigarette during a puff

Li, B.; Zhao, Lucan; Wang, L.; Liu, C.; McAdam, Kevin; Wang, B.

doi:10.1016/j.tca.2015.11.006

Cited by 20 publications

(22 citation statements)

References 9 publications

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“…According to the basic assumptions, the seepage of CH 4 and CO 2 in coal follows Darcy's law based on the analysis of the mass conservation equation (Eq. 2;Xu et al 2017;Li et al 2016;Zhong et al 2016;Le et al 2017).…”

Section: Mass Conservation Equation Of Gas Seepage Motionmentioning

confidence: 99%

Numerical simulation of enhancing coalbed methane recovery by injecting CO2 with heat injection

2019

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The technology used to enhance coalbed methane (CBM) recovery by injecting CO 2 (CO 2-ECBM) with heat, combining heat injection with CO 2 injection, is still in its infancy; therefore, theoretical studies of this CO 2-ECBM technology should be perused. First, the coupling equations of the diffusion-adsorption-seepage-heat transfer fields of gas are established. The displacement processes under different pressures and temperatures are simulated by COMSOL. Finally, the displacement effects, a comparison of the CO 2 storage capacity with the CH 4 output and the effective influencing radius of CO 2 injection are analyzed and discussed. The results show that (1) the displacement pressure and temperature are two key factors influencing the CH 4 output and the CO 2 storage capacity, and the increase in the CO 2 storage capacity is more sensitive to temperature and pressure than the CH 4 output. (2) The gas flow direction is from the injection hole to the discharge hole during the displacement process, and the regions with high velocity are concentrated at the injection hole and the discharge hole. (3) A reduction in the CH 4 concentration and an increase in the CO 2 concentration are obvious during the displacement process. (4) The effective influencing radius of injecting CO 2 with heat increases with the increase in time and pressure. The relationship between the effective influencing radius and the injection time of CO 2 has a power exponential function, and there is a linear relationship between the functional coefficient and the injection pressure of CO 2. This numerical simulation study on enhancing CBM recovery by injecting CO 2 with heat can further promote the implementation of CO 2-ECBM project in deep coal seams.

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Section: Mass Conservation Equation Of Gas Seepage Motionmentioning

confidence: 99%

Numerical simulation of enhancing coalbed methane recovery by injecting CO2 with heat injection

2019

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“…More detailed experimental and modelling work may be needed to identify, at a mechanistic level, the net contribution of the temperature, chemical interactions on the surface and the accumulation of smoke aerosol particles on the total filtration behaviour. (28) and that of the cigarette filter (right) in this study.…”

Section: Discussionmentioning

confidence: 54%

“…Progressively a higher amount of aerosol mass is generated by each later puff and passed downstream to the cigarette filter. Figure 9 depicts the gas-flow patterns from the burning coal (28) in connection with the flow velocity obtained in this work: the point to note is that as the coal approaches the last or second to last puff, the gas flow is not uniform. The burning coal was at the closest distance to the filter, more exactly the paper burn line was ca.…”

Section: Discussionmentioning

confidence: 91%

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Pressure and Gas Flow Distribution Inside the Filter of a Non-Filter Ventilated Lit Cigarette During Puffing

Cui

Zhao

et al. 2017

Beiträge Zur Tabakforschung International/Contributions to Tobacco Research

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SUMMARYEstablishing a realistic gas flow velocity distribution inside a cigarette filter during smoking is important to understand filtration mechanisms of different mainstream smoke species and the overall effect of filter designs on mainstream smoke composition. In this paper, an experimental method is described which directly measures the gas pressure field inside a cellulose acetate filter during cigarette smoking. This was demonstrated by using 3R4F research reference cigarettes smoked under a 35 mL puff of 6 s duration. In addition, filter temperature measurements were also carried out at multiple locations within the filter. Both the temperature and pressure sensing locations were selected to match the radial and longitudinal directions of the cigarette filter. The temperature and pressure measurements were then used to calculate the velocity according to Darcy's Law along the mainstream flow direction in the cigarette filter at each puff. The spatially resolved maps of temperature, pressure and flow velocity on a puff-by-puff basis provide useful insights into the dynamic filtration of smoke aerosol under the influence of the approaching burning coal and progressive accumulation of smoke particulate matter. [Beitr. Tabakforsch. Int. 27 (2017) 113-124]

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“…In addition to the above differential equations on CBMwater migration laws, two more auxiliary equations are needed to complete the simulation model of CBM productivity, respectively on the capillary force and the saturation of methane in water [16,17]:…”

Section: Auxiliary Equationsmentioning

confidence: 99%

Numerical Simulation of Coalbed Methane-Water Two-Phase Flow and Prediction of Coalbed Methane Productivity Based on Finite Volume Method

Wang¹,

Man²

2019

IJHT

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The finite volume method (FVM) can adapt to complex boundaries, achieve conservation of integrals, and generate flexible integral grids. Compared with the finite difference method (FDM), the FVM is immune to numerical oscillations and numerical dispersions. This paper aims to simulate the coalbed methane (CBM)-water two-phase flow in complex coal rock, and predict the CBM and water outputs in an accurate manner. Therefore, the FVM was introduced to create a simulation model of coalbed methane (CBM) productivity in 3D dual-porosity coal reservoir under non-equilibrium adsorption and pseudo-steady state conditions. The established model was applied to an actual project in Qinshui Basin, Shanxi Province, China. The historical gas and water outputs of a single CBM well were fitted with our model, and the simulated curves agree with the overall trend of the historical drainage and production curves. Next, the change trends of gas and water outputs in the CBM well were predicted, and the sensitivities of gas well productivity to three main reservoir parameters were analyzed. The results correctly reflect the productivity trend of the CBM well, indicating the correctness and feasibility of our model. Our research effectively simulates the migration of the CBM in coal rock with complex boundaries, providing a valuable reference for the development of the CBM.

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Gas-phase pressure and flow velocity fields inside a burning cigarette during a puff

Cited by 20 publications

References 9 publications

Numerical simulation of enhancing coalbed methane recovery by injecting CO2 with heat injection

Numerical simulation of enhancing coalbed methane recovery by injecting CO2 with heat injection

Pressure and Gas Flow Distribution Inside the Filter of a Non-Filter Ventilated Lit Cigarette During Puffing

Numerical Simulation of Coalbed Methane-Water Two-Phase Flow and Prediction of Coalbed Methane Productivity Based on Finite Volume Method

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