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Numerical Analysis of Entropy Production during Hydrogen-Air Burner Combustion Process

  • STEAM BOILERS, POWER-PLANT FUEL, BURNER DEVICES, AND AUXILIARY EQUIPMENT OF BOILERS
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Abstract

Entropy production during hydrogen-air diffusion in the combustion chamber (СС) was studied. A two-dimensional axisymmetric combustion chamber is considered in this paper. The numerical simulation of combustion has been done by Fluent software. The entropy production per unit volume for heat conduction and convection, mass diffusion, viscous dissipation, and the chemical reaction was calculated by user-defined function (UDF) post-processing, while the entropy production for heat transfer radiation was determined by post-processing with the help of calculated data of temperature. The results reveal that the radiation entropy production cannot be omitted when second law analysis of thermodynamic is adopted in high-temperature conditions such as boilers, heat exchangers, furnaces, etc; in these devices, thermal radiation is the basic mode of heat transfer. The effects of parameters such as Boltzmann number and Reynolds number on entropy production and entropy production number are analyzed. It is shown that the total entropy production number first decreases with the increase Reynolds and Boltzmann numbers; and then gradually increases. The results provide a theoretical reference for the improvement of thermodynamic efficiency for heat transfer and energy utilization.

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Authors and Affiliations

  1. School of Energy Science and Engineering, Harbin Institute of Technology, 150001, Harbin, China

    Ali Anwar Brohi & Hao-Chun Zhang

  2. Mehran University of Engineering and Technology, SZAB Campus, Khairpur Mir’s, Sindh, Pakistan

    Ali Anwar Brohi

  3. School of Electronics and Information Engineering, Harbin Institute of Technology, 150001, Harbin, China

    Shahid Karim

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  1. Ali Anwar Brohi
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Correspondence to Ali Anwar Brohi.

Additional information

This work is supported by the Foundation for Innovative Research Groups of the National Natural Science Foundation of China (Grant nos. 51776050 and 51536001), The Higher Education Commission (HEC) of Pakistan and Mehran University of Engineering and Technology, Jamshoro, Sindh, Pakistan.

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Ali Anwar Brohi, Zhang, HC. & Karim, S. Numerical Analysis of Entropy Production during Hydrogen-Air Burner Combustion Process. Therm. Eng. 67, 304–313 (2020). https://doi.org/10.1134/S0040601520050031

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