Experimental investigation of radiative heat propagation in a simplified generic packed bed--颗粒学报PARTICUOLOGY

Tyslik, M., Pörtner, L., Wirtz, S., & Schiemann, M. (2024). Experimental investigation of radiative heat propagation in a simplified generic packed bed. Particuology, 88, 149-160. https://doi.org/10.1016/j.partic.2023.09.005

Experimental investigation of radiative heat propagation in a simplified generic packed bed

Matthias Tyslik ^*, Lukas Pörtner, Siegmar Wirtz, Martin Schiemann

Institute of Energy Plant Technology, Ruhr-University Bochum, 44780 Bochum, Germany

10.1016/j.partic.2023.09.005

Volume 88, May 2024, Pages 149-160

Received 14 July 2023, Revised 7 September 2023, Accepted 10 September 2023, Available online 25 September 2023, Version of Record 6 November 2023.

E-mail: tyslik@leat.rub.de

Highlights

• Detailed description of a novel test rig for investigation of radiative heat transfer.

• Combination of three measurement techniques for heat transfer measurements.

• Comparison of heat transfer between specular and diffuse reflecting surfaces.

• Details of radiative heat transfer in particle beds become accessible and quantifiable.

Abstract

A novel test rig for the investigation of radiative heat transfer in packed beds has been developed and is introduced with representative experimental results. The individual components and the calibration are discussed. The generic packed bed is realized in a simplified way by an arrangement of parallel rods, which represent particles in pseudo-2D. In this arrangement, electrically heated rods provide the radiation propagating through the rod array to heat the passive counterparts. A sophisticated temperature-control scheme with a large number of thermocouples and infrared-imaging provides in-depth information about heat transfer in the system. Spectral radiation intensities are determined with a Fourier-transform infrared spectroscopy, which has been modified and validated for this specific application. In order to compare the influence of different surface properties of particles on the heat propagation and surface reflections, rod samples made of stainless steel and magnesium oxide are used. The influence of material properties becomes clearly visible by comparing the high radiation intensities resulting from a stainless steel rod array to the same geometry built from magnesium oxide rods. In addition, the influence of the surface properties is particularly evident in the infrared images since the reflections are significantly higher for the stainless steel samples than for the magnesium oxide samples. The experimental results in the current work demonstrate the ability of the test rig to provide data with a well-defined accuracy as a validation base for numerical radiation simulations in packed beds.

Graphical abstract

Keywords

Thermal radiation; Spectral reflections; Fourier-transform infrared spectroscopy

文章导读