ANALYSIS OF TWO-PHASE RADIATION IN THERMALLY DEVELOPING POISEUILLE FLOW

• Published in: Numerical heat transfer. Part A, Applications Vol. 36; no. 5; pp. 489 - 510
• Main Author: Kyung Moo Kim, Hyung Ju Lee, Seung Wook Baek
• Format: Journal Article
• Language: English
• Published: London Informa UK Ltd 01.10.1999; Taylor & Francis
• Subjects: Analytical and numerical techniques; Channel flow; Cylinders (shapes); DISCRETE ORDINATE METHOD; DUCTS; ENERGY CONSERVATION; ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; ENGINEERING; Exact sciences and technology; Fundamental areas of phenomenology (including applications); Gas absorption; Heat conduction; Heat radiation; Heat transfer; Integrodifferential equations; LAMINAR FLOW; Mathematical models; Nonlinear equations; PARAMETRIC ANALYSIS; Physics; RADIANT HEAT TRANSFER; TEMPERATURE DISTRIBUTION; THERMAL CONDUCTION; Thermal radiation; TWO-PHASE FLOW; Thermal radiation; Poiseuille flow; Thermal emissivity; Absorbent medium; Digital simulation; Circular pipe; Radiative transfer; Two phase medium; Particle suspension; Temperature fluctuation; Discrete ordinate method
• ISSN: 1040-7782; 1521-0634
• DOI: 10.1080/104077899274642

Combined conductive and radiative heat transfer in a thermally developing two-phase Poiseuille flow in a cylindrical duct is studied here. A two-phase radiative transfer equation (RTE) considering radiation by both gas and particles is taken into account. A complexform of nonlinear integrodifferential RTE is solved by the discrete ordinates method (DOM, or so called SN method) in axisymmetric geometry. After such validation, namely, the solution in a two-dimensional channel flow between two flat plates is compared with that solved by the zone method, the program is then applied to fully developed gas-particle two-phase flow in a cylindrical duct. A parametric study is performed for gas and particle absorption coefficients, particle number density, particle emissivity, and wall emissivity. The results show a significant effect of two-phase radiation on the thermal characteristics. However, in all cases, it was found that conduction is predominant near the wall.