Article
Mechanics
Bart Cleuren, Ralf Eichhorn
Summary: This study derives a general formalism that describes both dynamical and energetic properties of a microscopic Feynman ratchet. Work and heat flows are expressed as a series expansion in terms of thermodynamic forces, providing analytical expressions for the (non)linear response coefficients. Our findings extend previously obtained expressions in the field of chiral heat pumps.
JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT
(2023)
Article
Physics, Fluids & Plasmas
Varinder Singh, Satnam Singh, Obinna Abah, Ozgur E. Mustecaplioglu
Summary: We investigate the quantum Otto engine and refrigeration cycles of a time-dependent harmonic oscillator, exploring the conditions of maximum Q function. We derive analytical expressions for the efficiency and coefficient of performance of the Otto cycle, and observe interesting behaviors including the mapping of the harmonic Otto engine to Feynman's ratchet and pawl model and loop-like behavior of the efficiency-work curve for sudden frequency switches. Furthermore, we discuss the behavior of cooling power at maximum Q function.
Article
Physics, Multidisciplinary
Lock Yue Chew, Andri Pradana, Lianjie He, Jian Wei Cheong
Summary: This paper explores the stochastic thermodynamics of a finite-tape information ratchet system. It reveals that entropy production is driven by non-adiabatic processes, leading to spontaneous relaxation and switching operations in the system. These processes involve work extraction and dissipation of excess heat in the system.
EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS
(2023)
Article
Physics, Multidisciplinary
Jenny M. Poulton, Thomas E. Ouldridge
Summary: In living systems, the finite length of templates functions as a highly-selective engine that converts chemical and information-based free energy stored in the environment, revealing that copy accuracy does not directly impact overall thermodynamics. The energy stored in correlations between copy and template sequences is lost when the copy detaches and mixes with the environment, emphasizing the importance of template length in the copying process.
NEW JOURNAL OF PHYSICS
(2021)
Article
Multidisciplinary Sciences
Ryota Takaki, Mauro L. Mugnai, D. Thirumalai
Summary: Molecular motors, such as kinesin and myosin, utilize the energy from ATP hydrolysis to walk on polar tracks. The communication between the two motor heads, referred to as gating, is important for their functioning. In this study, we develop a framework to quantify the information flow between the motor heads and find that it is positively cooperative below a critical force value. When the force exceeds this critical value, the information flow ceases. We also observe that the critical force coincides with the force at which the probability of backward steps increases. Our findings suggest that the optimal transport efficiency of these motors is achieved at low forces.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Physics, Applied
Haoguang Liu, Jizhou He, Jianhui Wang
Summary: The article introduces a model of a quantum endoreversible Carnot engine cycle and its inverse operation - Carnot refrigeration cycle, and explores the relationship between their performance and the time allocated to two thermal-contact and two adiabatic processes.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Physics, Multidisciplinary
Pedro Paraguassu, Welles A. M. Morgado
Summary: This study investigates the statistical properties of heat exchanged by a Brownian particle subjected to a logarithm-harmonic potential. Analytical derivations, numerical integrations, and simulations were used to characterize the probability distribution of heat and fully understand its statistical behavior. The results highlight the asymptotic limit where the characteristic function is expressed in terms of hypergeometric functions.
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Ruibo Wang, Lingen Chen, Yanlin Ge, Huijun Feng
Summary: The study demonstrates that in an irreversible steady flow Lenoir cycle, optimizing heat conductance distribution and thermal capacity rate matching can reach the maximum power and efficiency points.
APPLIED SCIENCES-BASEL
(2021)
Article
Multidisciplinary Sciences
Benjamin Kuznets-Speck, David T. Limmer
Summary: Complex systems have the ability to regulate the transition speed between different long-lived states by converting energy from nonequilibrium forces, but currently there is no general framework to relate the enhancement of transition rate to energy dissipation. Recent advances in stochastic thermodynamics have provided a framework that allows for a deeper understanding of transitions far from equilibrium, revealing a basic speed limit that relates heat dissipation to achievable rate amplification. This speed limit is shown to tightly constrain the rate enhancement in various examples of barrier crossings in systems driven by autonomous and deterministic external forces.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Mechanics
Cheng Wang, Lin-feng Jiang, He-chuan Jiang, Chao Sun, Shuang Liu
Summary: This paper presents a numerical study of Rayleigh-Benard convection in two-dimensional cells with asymmetric roughness, finding that the effects of roughness on heat transfer and flow structure depend strongly on the Rayleigh number and roughness geometry. The presence of roughness significantly influences the organization of corner rolls and leads to sharp changes in Nu values and large-scale flow structure with slight increases in Ra. The impact of ratchet orientation on heat transfer and flow structure is also discussed.
JOURNAL OF HYDRODYNAMICS
(2021)
Review
Green & Sustainable Science & Technology
Z. Rahimi-Ahar, M. S. Hatamipour
Summary: This study explores the improvements in thermal desalination systems, with a focus on exergy. The research suggests that efforts should be made to minimize exergy destruction in order to enhance the overall efficiency of standalone systems. The integration of different desalination technologies and optimization of various factors can increase the exergy efficiency of a desalination plant.
CLEAN TECHNOLOGIES AND ENVIRONMENTAL POLICY
(2023)
Article
Energy & Fuels
Congzheng Qi, Lingen Chen, Yanlin Ge, Huijun Feng, Zhicong He
Summary: A new finite time thermodynamic model of thermal Brownian heat engine is established, and the effects of heat transfer process on system performance are studied. The power of the system can be maximized by optimizing the temperatures of the viscous medium and the distribution of heat exchanger inventory. The results show that enhancing the heat transfer between the reservoir and heat engine can improve the thermodynamic performance of the system.
Article
Green & Sustainable Science & Technology
T. Zhang, Y. F. Zhang, Z. R. Shi, Q. F. Li, J. Y. Cai
Summary: A hybrid PV/T collector/evaporator was designed and a hybrid system named PV-SAHP/GHP was proposed. Outdoor experiments were conducted to compare the operating characteristics of different modes. The results showed that the GHP-PV/T mode had satisfactory energy-saving effect while the PV-SAHP mode met the temperature demand but had unsatisfactory energy conservation effect. It is recommended to operate the GHP-PV/T mode during intense radiation and the PV-SAHP mode otherwise to balance the thermal performance and energy-saving benefits.
Article
Thermodynamics
Somchart Chantasiriwan
Summary: Conventionally, regenerative feed water heating is used to increase the net efficiency of a thermal power plant. However, there are limitations in terms of the number of feed water heaters and the mass flow rate of extracted steam. This paper proposes using extracted steam to increase air temperature as a way to increase the net power plant efficiency beyond the conventional design limits.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Physics, Multidisciplinary
Tong Fu, Jianying Du, Shanhe Su, Guozhen Su, Jincan Chen
Summary: A thermodynamic pump driven by Maxwell's demon is proposed in the study, considering the actual equivalent circuit model of three quantum dots with Coulomb coupling. The demon generates information that drives mass or heat transfer in the pump, allowing it to function without energy input. This system is shown to not violate the second law of thermodynamics.
EUROPEAN PHYSICAL JOURNAL PLUS
(2021)
Review
Physics, Multidisciplinary
Viktor Holubec, Artem Ryabov
Summary: The study of fluctuations in the performance of small heat engines has gained attention due to the development of microscopic machines. Understanding these fluctuations may lead to a revolution similar to the discovery of the second law of thermodynamics.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2022)
Article
Physics, Multidisciplinary
Viktor Holubec, Artem Ryabov, Sarah A. M. Loos, Klaus Kroy
Summary: A new class of stochastic delay processes with nonlinear time-local forces and linear time-delayed forces has been introduced, which obey fluctuation theorems and converge to a Boltzmann equilibrium at long times. These processes are stable, energetically passive, and computationally provide exact constraints on general nonlinear stochastic delay problems, suggesting potential applications in perturbative analysis. Physically, they can be interpreted as underdamped Brownian particles in different thermal baths, showing promising experimental implications.
NEW JOURNAL OF PHYSICS
(2022)
Article
Chemistry, Physical
Artem Ryabov, Mykola Tasinkevych
Summary: This study investigates a generic model of a self-propelled nanoparticle and reveals the significant impact of the assumption of microscopic reversibility on its dynamics, including enhanced diffusion coefficient, enhanced spectrum at all frequencies, and sigmoid-shaped transitions. These findings are expected to motivate new experimental studies and provide insights into the dynamics of catalytic macromolecules.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Mathematics, Applied
Artem Ryabov, Martin Zonda, Tomas Novotny
Summary: High-gain microwave amplifiers operating near quantum limit are crucial for the development of quantum technology. This paper presents a response theory for such amplifiers based on the nonlinear oscillations of an unshunted Josephson junction. The theory takes into account the interplay between fluctuations and nonlinear dynamics, and derives the amplifier gain and noise spectrum.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2022)
Article
Chemistry, Physical
David Vorac, Philipp Maass, Artem Ryabov
Summary: This study investigates the impact of polydispersity on particle currents in single-file Brownian motion of hard spheres, revealing a recurring pattern in dependence of the hard-sphere diameters and mixing ratio. The behavior of particle currents can be inferred based on a basic unit cell in the two hard-sphere diameters space. The analysis explains the occurrence of pronounced maxima and minima of the currents and predicts their variation in the fully covered system limit.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Physics, Fluids & Plasmas
Soren Schweers, Alexander P. Antonov, Artem Ryabov, Philipp Maass
Summary: Single-file diffusion refers to Brownian motion in narrow channels where particles cannot pass each other. In such processes, the diffusion of a tagged particle is normal at short times and becomes subdiffusive at long times. This study develops a scaling theory for adhesive particles and provides a full description of their time-dependent diffusive behavior. The results show that particle clustering induced by adhesive interaction slows down diffusion at short times and enhances subdiffusion at long times. The combined effects of pore structure and particle adhesiveness may speed up the translocation of molecules through narrow pores.
Article
Physics, Fluids & Plasmas
Alexander P. Antonov, Soeren Schweers, Artem Ryabov, Philipp Maass
Summary: We propose a simulation method for Brownian dynamics of hard rods in one dimension under arbitrary continuous external force fields. The method is based on event-driven procedures involving fragmentation and mergers of clusters formed by particles in contact. It can handle particle interactions in addition to hard-sphere exclusion, as long as the interaction forces are continuous functions of particle coordinates. Furthermore, we develop a treatment for sticky hard spheres using Baxter's contact interaction potential.
Article
Physics, Fluids & Plasmas
Daniel Geiss, Klaus Kroy, Viktor Holubec
Summary: The retardation between sensation and action has an impact on swarm models, affecting the ability of swarms to follow a leader, the spreading of information through the swarm, and the change in the orientation parameter. The effects vary with the length of the delay, the speed, and the conservation of orientation.
Article
Physics, Multidisciplinary
Zhuolin Ye, Federico Cerisola, Paolo Abiuso, Janet Anders, Marti Perarnau-Llobet, Viktor Holubec
Summary: We optimized finite-time stochastic heat engines with a periodically scaled Hamiltonian under experimentally motivated constraints on the bath temperature T and the scaling parameter lambda, and showed that the maximum-efficiency protocols for T and lambda are piecewise constant. Under certain conditions, this protocol can also maximize output power.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Chemistry, Physical
Dominik Lips, Eric Cereceda-Lopez, Antonio Ortiz-Ambriz, Pietro Tierno, Artem Ryabov, Philipp Maass
Summary: The study investigates the collective transport properties of colloidal particles in a rotating ring of optical traps. It is found that the particles are driven by a vortex flow of the surrounding fluid in the corotating reference frame. The jamming behavior observed with increasing particle density is attributed to enhanced energetic barriers between the optical traps due to hydrodynamic interactions. The study highlights the importance of considering the driving mechanism and hydrodynamic interactions in soft matter and biological systems.
Article
Physics, Fluids & Plasmas
Daniel Geiss, Klaus Kroy, Viktor Holubec
Summary: The study reveals that active many-body systems often break symmetries, with their collective behavior more naturally interpreted as a result of information exchange. In a simulated experiment on how information spreads through a flock, the dispersion relation gains a significant convective contribution along the leader's direction of motion, which seems to have a more consequential impact on the swarm response.
Article
Chemistry, Physical
Artem Ryabov, Mykola Tasinkevych
Summary: The physics of self-propelled objects at the nanoscale is a rapidly developing research field. However, the theoretical understanding of the possible self-propulsion mechanisms at this scale is limited. This study demonstrates that the fundamental principle of microscopic reversibility (MR) can increase particle mobility and diffusion coefficients, and external forces can further enhance these coefficients. These findings shed new light on the interpretation of measured diffusivities and help test the relevance of MR for the active motion of individual nanoswimmers.
Article
Physics, Fluids & Plasmas
Zhuolin Ye, Viktor Holubec
Summary: In this paper, we derive an analytical expression for the maximum efficiency of heat pumps operating along a finite-time reverse Carnot cycle under the low-dissipation assumption at fixed power. The result is complicated, but it provides simple formulas for tight upper and lower bounds on the maximum efficiency and various analytically tractable approximations. Our results agree qualitatively with those obtained earlier for endoreversible heat pumps, and we identify a special parameter regime where the performance of the low-dissipation and endoreversible devices is the same. We also find that heat pumps operate as work to heat converters with an efficiency of 1 at maximum power.
