THERMAL SCIENCE

International Scientific Journal

Meng Yue

,

Zhuo Li

,

Zunmin Li

,

Mengmeng Yu

EFFECT OF SURFACE EMISSIVITY ON THE RADIATIVE EFFICIENCY OF DIVERGENT POROUS BURNER

ABSTRACT
A 2-D numerical study is performed on a divergent radiant porous burner to study the surface emissivity, εr, on the radiative efficiency, η, and uniform distribution of heating temperature. It is shown that the εr has a significant impact on both the η and uniformity distribution of heating temperature over the whole investigation range for inlet velocity of 0.4-7.5 m/s and equivalence ratio range of 0.45-1.0. The η is always increased with the εr. For example, the η at an equivalence ratio of 0.75 and an inlet velocity of 1.8 m/s is increased from 0.0817-0.155 with εr. Meanwhile, a significant expansion of the upper limit of the modeled burner is validated, compared to the conventional one. The increased εr leads to the slightly narrower stability limit. Furthermore, uniform heating temperature is predicted over the whole investigation. The maximum root mean square of the heating temperature is in the order of 30 K. The divergent two-section porous burner achieves wider stability limits with comparable η compared to the conventional one.
KEYWORDS
stability map, Two-section burner, Porous burner, temperature uniformity, Radiative efficiency
PAPER SUBMITTED: 2025-06-12
PAPER REVISED: 2025-08-23
PAPER ACCEPTED: 2025-08-24
PUBLISHED ONLINE: 2025-11-01
DOI REFERENCE: https://doi.org/10.2298/TSCI250612173Y
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2026, VOLUME 30, ISSUE No. 2, PAGES [1493 - 1503]
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Effect of surface emissivity on the radiative efficiency of divergent porous burner

© 2026 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence