Publications by authors named "Michal Hemmerling"
Article Synopsis
- Quantum thermal engines, particularly those using Bose-Einstein condensed gases like rubidium-87, are being explored for their potential applications but have had limited research on energy transfers during phase transitions.
- An empirical equation of state model was developed to analyze the relationship between pressure, temperature, and other factors in these gas samples, helping to measure entropy and enthalpy during the BEC transition.
- Findings indicated that the entropy remains constant during the BEC transition, suggesting it could serve as an energy source for non-mechanical work, marking progress toward practical quantum thermal engines.
Carnot cycles of samples of harmonically confined ultracold 87Rb fluids, near and across Bose-Einstein condensation (BEC), are analyzed. This is achieved through the experimental determination of the corresponding equation of state in terms of the appropriate global thermodynamics for non-uniform confined fluids. We focus our attention on the efficiency of the Carnot engine when the cycle occurs for temperatures either above or below the critical temperature and when BEC is crossed during the cycle.
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