Quantum gases in ring traps: From quantized flows to supersonic rotation

2020 ◽  
Author(s):  
Hélène Perrin
Keyword(s):  
Quantum Gases ◽  
Supersonic Rotation

scholarly journals Performance Analysis and Optimization for Irreversible Combined Carnot Heat Engine Working with Ideal Quantum Gases

Entropy ◽  
2021 ◽  
Vol 23 (5) ◽  
pp. 536
Author(s):  
Lingen Chen ◽  
Zewei Meng ◽  
Yanlin Ge ◽  
Feng Wu
Keyword(s):  
Power Output ◽  
Thermal Efficiency ◽  
Combined Cycle ◽  
Quantum Gases ◽  
Carnot Cycle ◽  
Leakage Loss ◽  
Optimal Power ◽  
Heat Leakage ◽  
Working Medium ◽  
Ideal Quantum

An irreversible combined Carnot cycle model using ideal quantum gases as a working medium was studied by using finite-time thermodynamics. The combined cycle consisted of two Carnot sub-cycles in a cascade mode. Considering thermal resistance, internal irreversibility, and heat leakage losses, the power output and thermal efficiency of the irreversible combined Carnot cycle were derived by utilizing the quantum gas state equation. The temperature effect of the working medium on power output and thermal efficiency is analyzed by numerical method, the optimal relationship between power output and thermal efficiency is solved by the Euler-Lagrange equation, and the effects of different working mediums on the optimal power and thermal efficiency performance are also focused. The results show that there is a set of working medium temperatures that makes the power output of the combined cycle be maximum. When there is no heat leakage loss in the combined cycle, all the characteristic curves of optimal power versus thermal efficiency are parabolic-like ones, and the internal irreversibility makes both power output and efficiency decrease. When there is heat leakage loss in the combined cycle, all the characteristic curves of optimal power versus thermal efficiency are loop-shaped ones, and the heat leakage loss only affects the thermal efficiency of the combined Carnot cycle. Comparing the power output of combined heat engines with four types of working mediums, the two-stage combined Carnot cycle using ideal Fermi-Bose gas as working medium obtains the highest power output.

scholarly journals Nonequilibrium steady states of ideal bosonic and fermionic quantum gases

2015 ◽  
Vol 92 (6) ◽  
Author(s):  
Daniel Vorberg ◽  
Waltraut Wustmann ◽  
Henning Schomerus ◽  
Roland Ketzmerick ◽  
André Eckardt
Keyword(s):  
Steady States ◽  
Quantum Gases ◽  
Nonequilibrium Steady States

scholarly journals The Zel’dovich effect in harmonically trapped, ultracold quantum gases

2012 ◽  
Vol 45 (4) ◽  
pp. 045303 ◽  
Author(s):  
Aaron Farrell ◽  
Zachary MacDonald ◽  
Brandon P van Zyl
Keyword(s):  
Quantum Gases ◽  
Ultracold Quantum Gases

scholarly journals A Note on the Cluster Expansion for Quantum Gases

1964 ◽  
Vol 31 (4) ◽  
pp. 538-552 ◽  
Author(s):  
Hiroshi Ichimura
Keyword(s):  
Cluster Expansion ◽  
Quantum Gases

scholarly journals Collective excitations of trapped one-dimensional dipolar quantum gases

2008 ◽  
Vol 77 (1) ◽  
Author(s):  
P. Pedri ◽  
S. De Palo ◽  
E. Orignac ◽  
R. Citro ◽  
M. L. Chiofalo
Keyword(s):  
Quantum Gases ◽  
Collective Excitations ◽  
One Dimensional
Sign in / Sign up

Export Citation Format

Share Document