2000
DOI: 10.1016/s0141-3910(00)00040-9
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Modeling decomposition of unconfined rigid polyurethane foam

Abstract: The decomposition of ,unconfined rigid polyurethane foam has been modeled by a kinetic bond-breaking scheme describing degradation of a primary polymer and formation of a thermally stable secondary polymer. The bond-breaking scheme is resolved using percolation theory to describe evolving polymer fragments. The polymer fragments vaporize according to individual vapor pressures. Kinetic parameters for the model were obtained from Thermal Gravimetric Analysis (TGA). The chemical structure of the foam was determi… Show more

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Cited by 57 publications
(54 citation statements)
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“…Removal of elements from the computational domain is referred to as "element death." A solid fraction death criterion, In previous studies [5][6][7], the element death criterion was selected based on the measured onset of burnout. Burnout is defined as the solid mass fraction where most of the organic material has decomposed and the residue primarily consists of nonvolatile matter.…”
Section: Element Death Criterionmentioning
confidence: 99%
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“…Removal of elements from the computational domain is referred to as "element death." A solid fraction death criterion, In previous studies [5][6][7], the element death criterion was selected based on the measured onset of burnout. Burnout is defined as the solid mass fraction where most of the organic material has decomposed and the residue primarily consists of nonvolatile matter.…”
Section: Element Death Criterionmentioning
confidence: 99%
“…The temperature of the onset of burnout was determined for various experiments. In previous studies [5][6][7], the mean of the temperature corresponding to the onset of burnout was used with the mass loss model to define the death criterion.…”
Section: Element Death Criterionmentioning
confidence: 99%
See 1 more Smart Citation
“…A) Centerline distance from heated surface for various time-step "zombie criterion," B) CPU-time as function of the zombie criterion, and C) percent of overall CPU attributed to radiation viewfactor calculations and chemistry calculations. [4].…”
Section: Example Calculation Of Inert Components Encapsulated In Rigimentioning
confidence: 99%
“…A better approach for confined systems would probably be a combination of the CPUF (chemical-structure based) and SPUF (general discretization bias correction) models with additional physics to account for off gas composition, mass transport, liquefaction, pressurization, and flow. Two foam response models have been developed previously for unconfined decomposition of polyurethane foam -PUF [3,4] and CPUF [5]. These models (PUF and CPUF) present a framework to determine gas composition necessary to predict dynamic pressurization in closed, confined systems.…”
Section: List Of Tablesmentioning
confidence: 99%