Entropy Generation Rates in Two-Dimensional Rayleigh–Taylor Turbulence Mixing
Faculty of Mechanical Engineering and Automation, Zhejiang Sci-Tech University, Hangzhou 310018, China
Zhejiang Yilida Ventilator Company, Taizhou 318056, China
State-Province Joint Engineering Lab of Fluid Transmission System Technology, Hangzhou 310018, China
College of Energy Engineering, Zhejiang University, Hangzhou 310018, China
Authors to whom correspondence should be addressed.
Received: 20 August 2018 / Revised: 13 September 2018 / Accepted: 17 September 2018 / Published: 26 September 2018
Entropy generation rates in two-dimensional Rayleigh–Taylor (RT) turbulence mixing are investigated by numerical calculation. We mainly focus on the behavior of thermal entropy generation and viscous entropy generation of global quantities with time evolution in Rayleigh–Taylor turbulence mixing. Our results mainly indicate that, with time evolution, the intense viscous entropy generation rate
and the intense thermal entropy generation rate
occur in the large gradient of velocity and interfaces between hot and cold fluids in the RT mixing process. Furthermore, it is also noted that the mixed changing gradient of two quantities from the center of the region to both sides decrease as time evolves, and that the viscous entropy generation rate
and thermal entropy generation rate
constantly increase with time evolution; the thermal entropy generation rate
with time evolution always dominates in the entropy generation of the RT mixing region. It is further found that a “smooth” function
and a linear function
are achieved in the spatial averaging entropy generation of RT mixing process, respectively.
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MDPI and ACS Style
Yang, X.; He, H.; Xu, J.; Wei, Y.; Zhang, H. Entropy Generation Rates in Two-Dimensional Rayleigh–Taylor Turbulence Mixing. Entropy 2018, 20, 738.
Yang X, He H, Xu J, Wei Y, Zhang H. Entropy Generation Rates in Two-Dimensional Rayleigh–Taylor Turbulence Mixing. Entropy. 2018; 20(10):738.
Yang, Xinyu; He, Haijiang; Xu, Jun; Wei, Yikun; Zhang, Hua. 2018. "Entropy Generation Rates in Two-Dimensional Rayleigh–Taylor Turbulence Mixing." Entropy 20, no. 10: 738.
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