Optical thermometry for high temperature multiphase environments under high-flux irradiation

Dahe Gu, Zhiwei Sun, Graham J. Nathan, Xue Dong, Bassam B. Dally, Paul R. Medwell, Zeyad T. Alwahabi

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


A non-intrusive optical method to measure gas phase temperature in strongly scattering multiphase environments under high-flux, broad-band irradiation, relevant to conditions in high temperature solar reactors was developed and demonstrated. The high-flux irradiation with a peak flux of 450 kW/m2was provided by a 6 kW metal-halide lamp coupled with a reflector and two concentrators. An ethylene/air diffusion flame, which contains fine soot particles, was employed to provide a high temperature reacting flow (approximately 1800 K) with strong optical interference from nano particles having a peak soot volume fractions of ∼16 ppm (with irradiation) under conditions of relevance to solar reactors. Under this environment, the proposed laser-based thermometry technique, line-wise two-line atomic fluorescence (TLAF) has been successfully demonstrated to measure flame temperature with good spatial resolution of ∼1 mm. It was found that the measurement accuracy in the presence of particle and the high-flux external radiation is 65 K at a typical flame temperature of ∼1800 K, while the measurement precision is 38 K. Results reveal that the presence of high-flux irradiation increases the flame temperature by typically 50–100 K. This paper presents a thermometry technique that is suitable for temperature measurement within solar reactors, particularly in hybrid solar-thermal receiver-combustor systems. The experimental setup, measurement methodology and data processing are discussed, followed by the temperature measurements.
Original languageEnglish (US)
Pages (from-to)191-198
Number of pages8
JournalSolar Energy
StatePublished - Jan 1 2017
Externally publishedYes

Bibliographical note

Generated from Scopus record by KAUST IRTS on 2022-09-12

ASJC Scopus subject areas

  • General Materials Science
  • Renewable Energy, Sustainability and the Environment


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