The scattering phase function coefficients of pulverized-coal particles in flames
The most significant mode of heat transfer in large-scale combustion systems is radiative transfer. To model such systems, radiation heat transfer should be accounted for correctly, which requires a thorough knowledge of the radiative properties of combustion products (Viskanta and Menguec, 1987; Menguec and Webb, 1992). It is usually difficult to calculate the properties of coal/char particles and soot agglomerates from theory, as they are non-homogeneous and irregularly shaped. Therefore, it is desirable to determine the effective radiative properties of these particles directly from experiments. The information available for the optical and radiative properties of burning coal/char particles in the infrared region of the wavelength spectrum is scarce. It is more desirable to estimate the effective parameters required in the solution of the radiative transfer equation (RTE), i.e., the absorption and scattering coefficients and the scattering phase function of coal and char particles. In the present study, we determined the scattering characteristics of pulverized-coal particles heated in a premixed flame directly from experiments. The details of the theoretical models considered for data reduction were already reported in another paper (Menguec, et al., 1991). In the following sections, first we will briefly discuss the experimental system used. After that the results will be presented and compared against those obtained from the Lorenz-Mie theory for spherical particles.
- Research Organization:
- Kentucky Univ., Lexington, KY (United States). Dept. of Mechanical Engineering
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG22-87PC79916
- OSTI ID:
- 10149865
- Report Number(s):
- CONF-9204103-4; ON: DE94011690; BR: AA1525000
- Resource Relation:
- Conference: Combustion Institute central states spring meeting on combustion fundamentals and applications,Columbus, OH (United States),26-28 Apr 1992; Other Information: PBD: [1992]
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
COAL
RADIANT HEAT TRANSFER
SCATTERING
PARTICULATES
PARTICLE SIZE
WAVELENGTHS
FLAMES
TEMPERATURE DEPENDENCE
EXPERIMENTAL DATA
INFRARED RADIATION
NEAR INFRARED RADIATION
CHARS
FRAGMENTATION
ABSORPTION
420400
400800
HEAT TRANSFER AND FLUID FLOW
COMBUSTION, PYROLYSIS, AND HIGH-TEMPERATURE CHEMISTRY