Numerical analysis on the hot spot in reactive chemical storage

Sheu, Long-Jye; Lin, Jun; Chen, Jenq-Renn

doi:10.1016/s0950-4230(98)00056-4

Cited by 7 publications

(15 citation statements)

References 7 publications

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“…Archer 18 Sphere Experimental Thermal decomposition of azomethane Gerri and Kaufman 19 Sphere Experimental Thermal decomposition of pure azomethane. Ashmore et al 20 Sphere Experimental Mixtures of hydrogen and chlorine as well as hydrogen, chlorine and nitrosyl chloride Jones 21 Infinite parallel plates Analytical Zeroth-order Jones 22 Infinite circular horizontal cylinder Numerical Zeroth-order Sheu et al 23 Vertical circular cylinder (Height / Radius = 1) Numerical Zeroth-order…”

Section: Discussionmentioning

confidence: 99%

“…The characteristic lengths chosen for the systems discussed above follow the conventional guideline as being the shortest distance from the centre of symmetry to the nearest wall. 4 For example, the value of c δ~ 5.43 reported by Sheu et al 23 for a vertical cylindrical tank was based on the full height and hence should be reduced by a factor of 4. The length scales used for the results in Fig.…”

Section: 4mentioning

confidence: 99%

“…Thus, each geometry is expected to have a different value of ( ) c D H τ τ / : these are, respectively, 0.30, 0.50, 0.59, 0.74 and 1.14 for a sphere 2 , infinite horizontal circular cylinder 2 , infinite horizontal square cylinder 6 , vertical cylindrical tank 23 and parallel plates 2 . The value of…”

Section: 4mentioning

confidence: 99%

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Effects of natural convection on thermal explosion in a closed vessel

Liu

Campbell

Cardoso

et al. 2008

Phys. Chem. Chem. Phys.

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A new way of ascertaining whether or not a reacting mixture will explode uses just three timescales: that for chemical reaction to heat up the fluid containing the reactants and products, the timescale for heat conduction out of the reactor, and the timescale for natural convection in the fluid. This approach is developed for an n-th order chemical reaction, A → B occurring exothermically in a spherical, batch reactor. The three timescales are expressed in terms of the physical and chemical parameters of the system. Numerical simulations are performed for laminar natural convection occurring; also, a theoretical relation is developed for turbulent flow. These theoretical and numerical results agree well with previous experimental measurements for the decomposition of azomethane in the gas phase. The new theory developed here is compared with Frank-Kamenetskii's classical criterion for explosion. This new treatment has the advantage of separating the two effects inhibiting explosion, viz. heat removal by thermal conduction and by natural convection. Also, the approach is easily generalised to more complex reactions and flow systems.

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Section: Discussionmentioning

confidence: 99%

Section: 4mentioning

confidence: 99%

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Effects of natural convection on thermal explosion in a closed vessel

Liu

Campbell

Cardoso

et al. 2008

Phys. Chem. Chem. Phys.

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“…On the contrary, the reaction kinetic mechanism is not determined by fluid flow and remains the same regardless of the storage quantity. Recently, Sheu, Lin, and Chen (1999) conducted numerical analysis on the hot spot distribution for a reactive chemical whose reaction mechanism follows a zero order reaction. Campbell, Cardoso, and Hayhurst (2007) compared the experimental temperature distribution with numerical analysis results when natural convection is considered.…”

Section: Introductionmentioning

confidence: 99%

“…In the work of Sheu et al (1999), a modified Rayleigh number was used to characterize the natural convection developed inside a cylinder storage tank. However, this modified Rayleigh number is related to the apparent activation energy of specific reaction.…”

Section: Introductionmentioning

confidence: 99%