Unsteady 2D coupled heat and mass transfer in porous media with biological and chemical heat generations

Moraga, Nelson O.; Corvalán, F.; Escudey, Mauricio; Arias, A.; Zambra, Carlos E.

doi:10.1016/j.ijheatmasstransfer.2009.07.027

Cited by 33 publications

(21 citation statements)

References 41 publications

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“…We believe that the effects of temperature gradients and the depletion of cellulosic materials and biomass are negligible for large compost piles for the range of temperatures considered in this study. Moraga et al [11] showed explicitly, from their experimental data of a sewage sludge pile, that the model and parameter values used by Sidhu et al [15] (that is, without air flow) provided reasonable predictions of temperature increases within the pile. Since the present model extends the work of Sidhu et al [15] by including air flow, we believe that the current investigation illustrates the trends when the flow of air is included.…”

Section: Governing Equationsmentioning

confidence: 97%

Determining critical conditions for two dimensional compost piles with air flow via numerical simulations

Luangwilai¹,

Sidhu²

2011

ANZIAMJ

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We consider the self-heating process of a two dimensional, spatially dependent, model of a compost pile which incorporates terms that account for self-heating due to both biological and oxidative mechanisms. This self-heating model consists of mass balance equations for oxygen and energy. We study the effects of air flow through the pile. Numerical solutions determine critical conditions for thermal ignition within the compost pile. Two distinct numerical approaches corroborate solutions to the self-heating problem in compost piles. We analyse the model numerically using FlexPDE (a commercial software package) in a two dimensional configuration. The results obtained are then compared with those obtained using the Method of Lines. We focus mainly on the critical conditions for thermal ignition for different rates of air flow moving through the compost pile.

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Section: Governing Equationsmentioning

confidence: 97%

Determining critical conditions for two dimensional compost piles with air flow via numerical simulations

Luangwilai¹,

Sidhu²

2011

ANZIAMJ

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“…At this stage, the liberated heat by oxidation is much higher than the released heat to the surrounding. This is further followed up by the temperature decrease because of the depletion of oxygen inside the piles (Moraga et al, 2009). …”

Section: Introductionmentioning

confidence: 97%

“…Generally, composting can be divided into four stages (Moraga et al, 2009). In the first stage, the temperature increases due to the growth of aerobic microorganisms.…”

Section: Introductionmentioning

confidence: 99%

“…The operating conditions seem to play an important role of self-heating during composting (Moraga et al, 2009). The height of compost piles may affect the extent of self-heating since it is related to the ratio of volume per unit surface area.…”

Section: Introductionmentioning

confidence: 99%

“…The height of compost piles may affect the extent of self-heating since it is related to the ratio of volume per unit surface area. The higher ratio of the volume per unit surface area accelerates the self-heating (Moraga et al, 2009). …”

Section: Introductionmentioning

confidence: 99%

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A new model to predict diffusive self-heating during composting incorporating the reaction engineering approach (REA) framework

Putranto

Chen

2017

Bioresource Technology

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A new model to predict diffusive self-heating during composting incorporating the reaction engineering approach (REA) framework Putranto, A., & Chen, X. D. (2017). A new model to predict diffusive self-heating during composting incorporating the reaction engineering approach (REA) framework. Bioresource Technology, 232, Publisher rights © 2017 Elsevier Ltd. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/bync-nd/4.0/,which permits distribution and reproduction for non-commercial purposes, provided the author and source are cited. General rightsCopyright for the publications made accessible via the Queen's University Belfast Research Portal is retained by the author(s) and / or other copyright owners and it is a condition of accessing these publications that users recognise and abide by the legal requirements associated with these rights.Take down policy The Research Portal is Queen's institutional repository that provides access to Queen's research output. Every effort has been made to ensure that content in the Research Portal does not infringe any person's rights, or applicable UK laws. If you discover content in the Research Portal that you believe breaches copyright or violates any law, please contact openaccess@qub.ac.uk.

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Modelling air flow and ambient temperature effects on the biological self‐heating of compost piles

Luangwilai

Sidhu

Nelson

et al. 2010

Asia-Pacific J Chem Eng

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We formulate and investigate a one-dimensional model for self-heating in compost piles. The selfheating occurs through a combination of biological and chemical mechanisms. Biological heat generation is known to be present in most industrial processes handling large volumes of bulk organic materials. The heat release rate due to biological activity is modelled by a function which at sufficiently low temperatures is a monotonic increasing function of temperature. At higher temperatures, it is a monotonic decreasing function of temperature. This functionality represents the fact that micro-organisms die or become dormant at high temperature. The heat release due to oxidation reaction is modelled by Arrhenius kinetics. The model consists of mass balance equations for oxygen and energy. Steady-state temperature diagrams are determined as a function of the size of the compost pile and the flow rate of air through the pile. We show that there is a range of flow rates for which elevated temperatures, including the possibility of spontaneous ignition, occur within the pile. We also investigate the effects of variations in the ambient temperature.

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Unsteady 2D coupled heat and mass transfer in porous media with biological and chemical heat generations

Cited by 33 publications

References 41 publications

Determining critical conditions for two dimensional compost piles with air flow via numerical simulations

Determining critical conditions for two dimensional compost piles with air flow via numerical simulations

A new model to predict diffusive self-heating during composting incorporating the reaction engineering approach (REA) framework

Modelling air flow and ambient temperature effects on the biological self‐heating of compost piles

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