Highly-Directional Radiative Intensity in a 2-D Rectangular Enclosure Calculated by the DRESOR Method

Abstract

Radiative intensity in 6,658 and 281 directions in the hemispheric space was provided by the distribution of ratios of energy scattered by the medium or reflected by the boundary surface method (DRESOR) at the boundary of a two-dimensional enclosure filled with isotropic and anisotropic scattering medium, respectively. The dimensionless radiative heat flux achieved by the DRESOR method agreed well with those by other methods in the literature. Besides the polar angle, the intensity at the boundary varies significantly with the azimuthal angle, especially for the points close to the emitting source. In the anisotropic scattering media, the largest boundary intensity occurs with the largest forward scattering capability.

Experimental investigation on simultaneous measurement of temperature distributions and radiative properties in an oil-fired tunnel furnace by radiation analysis

“…Although the DRESOR method has been proven to solve the radiative transfer equation accurately [25,26], two special cases are used to verify the radiative imaging model calculated by the DRESOR method in this study.…”

“…Consequently, the pixels in the vertical line in every image can be divided into N1 image-formation elements (N1 is chosen as 180), and totally N image-formation elements (N is then 360 because of two flame image detectors). A new way called DRESOR method has been proposed to solve radiative transfer equation and calculate the radiative intensity with highly-directional resolution in 1-D/2-D system [25,26]. According to the DRESOR method, the radiative intensity received by the i th image-formation element in a CCD camera located in point O in the directionŝ; I k ðO;ŝÞ, can be calculated as [22,23] …”

“…R s d ða; b;ŝÞ is called DRESOR value, which is the ratio of energy reflected by a unit area at the point b to that emitted from a unit volume or a unit area centered at the point a within a unit cone centered inŝ multiplied by 4p. The DRESOR values can be obtained using the Monte Carlo method as described in [25,26]. The discrete form of Eq.…”

Equation Solving DRESOR Method for Radiative Transfer in Three-Dimensional Isotropically Scattering Media

“…It was first proposed to solve a problem with a one-dimensional isotropically scattering medium [16] and then extended to solve a problem with an anisotropically scattering me dium [17], This method was also applied to solve radiative prob lem with collimated irradiation [18] and transient radiative problem [19,20]. The two-dimensional problem was considered by Cheng et al [21]. Recently it has been extended to solve a three-dimensional radiative problem [22].…”

“…As stated in our previous work [16][17][18][19][20][21][22], if the radiative proper ties of the medium and boundaries are known, the radiative inten sity in an arbitrary direction at any point in the system can be expressed as a function of the DRESOR values and blackbody emission of every element. Therefore, the DRESOR values play a very important role in the DRESOR method.…”