Multiphysics modeling of carbon gasification processes in a well-stirred reactor with detailed gas-phase chemistry

Modeling radiation in particle clouds: on the importance of inter-particle radiation for pulverized solid fuel combustion

“…This is the case in the work of e.g. Qiao et al [4] and Mitchell et al [6]. The proposed radiative cooling term will also be applicable when Direct Numerical Simulations (DNS) are being used to simulate a very small sub domain of a real application 1 .…”

“…In Table 1, particle data found in the literature is presented. Case A is from a coal gasification reactor, while the data of [9] are from Table 1 Mean particle sizes and number densities from previous studies [4,9]. The listed extinction coefficients has been calculated from Eq.…”

“…Simulations of the gasification process presented in a paper by Qiao et al (2012) [4] has been performed in order to emphasize the importance of including inter-particle radiation for dense clouds of particles. The numerical code used to perform the simulations was comparable to the code used in the above mentioned paper.…”

“…If, on the other hand, one does not perform a full CFD simulation but is rather interested in solving single particle physics and chemistry in high detail one often neglects, or partly neglects, radiation. In such cases radiation may not be considered at all, or if it is taken into account, only particle-wall radiation [4,5,6] or particle-fluid radiation [7] is considered. The primary aim of this paper is to obtain a realistic description for the particle radiation transfer, including both particle-to-wall and particle-to-particle radiation, that can be used for high detail particle simulations.…”

“…Traditionally, the particle cooling term used for such single particle simulations of a cloud of particles has been given by [4,6] …”