Nan Zhu , Yuxuan Ma , Yajun Huang , Shixiang Liu , Margaret Mcnamee , Patrick van Hees , Longhua Hu
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引用次数: 0
Abstract
This paper presents an experimental study on the joint effects of concurrent airflow and sample width on the steady flame spread behaviors. Flame spread parameters, including flame height, preheating length, heat flux distribution, flame spread rate (FSR) and pyrolysis length, were measured and analyzed comprehensively. Results show that the FSR and pyrolysis length increase with sample width and concurrent airflow velocity. For wider samples, FSR and pyrolysis length are more sensitive to the changes in airflow velocity. The flame height and preheating length increase with sample width, due to the enhanced fuel burning rate and limited air entrainment. The average heat flux in preheating zone is independent to the airflow velocity and sample width. In pyrolysis zone, the convective heat flux is the dominant heat transfer term under concurrent airflow. Theoretical analysis indicates that in steady spread stage, FSR and the pyrolysis length are proportional to the concurrent airflow velocity. Additionally, FSR increase with the 1/3rd power of sample width, whereas the pyrolysis length increases with the 2/3rd power of sample width. Pyrolysis length can be well predicted based on the energy balance at the pyrolysis front.
期刊介绍:
International Communications in Heat and Mass Transfer serves as a world forum for the rapid dissemination of new ideas, new measurement techniques, preliminary findings of ongoing investigations, discussions, and criticisms in the field of heat and mass transfer. Two types of manuscript will be considered for publication: communications (short reports of new work or discussions of work which has already been published) and summaries (abstracts of reports, theses or manuscripts which are too long for publication in full). Together with its companion publication, International Journal of Heat and Mass Transfer, with which it shares the same Board of Editors, this journal is read by research workers and engineers throughout the world.