Work extraction and performance of colloidal heat engines in viscoelastic baths
arXiv:2012.10607 · doi:10.3389/fphy.2021.643333
Abstract
A colloidal particle embedded in a fluid can be used as a microscopic heat engine by means of a sequence of cyclic transformations imposed by an optical trap. We investigate a model for the operation of such kind of Brownian engines when the surrounding medium is viscoelastic, which endows the particle dynamics with memory friction. We analyze the effect of the relaxation time of the fluid on the performance of the colloidal engine under finite-time Stirling cycles. We find that, due to the frequency-dependence of the friction in viscoelastic fluids, the mean power delivered by the engine and its efficiency can be highly enhanced as compared to those in a viscous environment with the same zero-shear viscosity. In addition, with increasing fluid relaxation time the interval of cycle times at which positive power output can be delivered by the engine broadens. Our results reveal the importance of the transient behavior of the friction experienced by a Brownian heat engine in a complex fluid, which cannot be neglected when driven by thermodynamic cycles of finite duration.
5 Figures, 14 pages, Frontiers in Physics (Received: 17 December 2020; Accepted: 04 March 2021; Published: 29 March 2021)
References in corpus (15)
- Artificial Brownian motors: Controlling transport on the nanoscale
- Efficiency at maximum power: An analytically solvable model for stochastic heat engines
- Power laws in microrheology experiments on living cells: comparative analysis and modelling
- Experimental Realization of a Minimal Microscopic Heat Engine
- Tuning the motility and directionality of self-propelled colloids
- Single Particle Stochastic Heat Engine
- Exactly solvable model of stochastic heat engine: Optimization of power, its fluctuations and efficiency
- Molecular kinetic analysis of a finite-time Carnot cycle
- Effects of active fluctuations on energetics of a colloidal particle: superdiffusion, dissipation and entropy production
- Probing linear and nonlinear microrheology of viscoelastic fluids
- Rotational hot Brownian motion
- Underdamped Active Brownian Heat Engine
- Atomic theory of viscoelastic response and memory effects in metallic glasses
- Transient coarsening and the motility of optically heated Janus colloids in a binary liquid mixture
- Optical Tweezers: A Comprehensive Tutorial from Calibration to Applications