scholarly journals Minimal dissipation processes and estimates of limiting possibilities of irreversible thermodynamic systems

2004 ◽  
Author(s):  
A.M. Tsirlin ◽  
V. Kazakov
Keyword(s):  
Irreversible Thermodynamic ◽  
Minimal Dissipation ◽  
Dissipation Processes

Dissipation and Conditions of Equilibrium for an Open Microeconomic System

2001 ◽  
Vol 08 (02) ◽  
pp. 157-168 ◽  
Author(s):  
Anatolii Tsirlin ◽  
Sergey Amelkin
Keyword(s):  
Optimal Control ◽  
Stationary State ◽  
Irreversible Thermodynamic ◽  
Extremal Principle ◽  
Minimal Dissipation

An analogy between microeconomic and irreversible thermodynamic systems is shown. The concepts of economic irreversibility, dissipation of capital are introduced and conditions of minimal dissipation are obtained. Problems of optimal control of prices in the processes of resources exchange are solved and the extremal principle for the determination of stationary state of an open microeconomic system is formulated.

Energy Dissipation Processes of Singlet Excited 1-Hydroxyfluorenone and its Hydrogen-Bonded Complex with N-Methylimidazole

2004 ◽  
Author(s):  
Krisztina Sebők-Nagy ◽  
László Biczók ◽  
Akimitsu Morimoto ◽  
Tetsuya Shimada ◽  
Haruo Inoue
Keyword(s):  
Energy Dissipation ◽  
Dissipation Processes ◽  
Hydrogen Bonded

Thermodynamic Estimate of Minimal Dissipation for Heat Exchange System

2008 ◽  
Author(s):  
Andrei A. Akhremenkov ◽  
Anatoliy M. Tsirlin ◽  
Vladimir Kazakov
Keyword(s):  
Heat Exchanger ◽  
Heat Exchange ◽  
Heat Load ◽  
Point Of View ◽  
Exchange System ◽  
Heat Exchange System ◽  
Heat Exchange Surface ◽  
Minimal Dissipation ◽  
The Difference ◽  
Exchange Surface

In this paper we consider heat exchange system from point of view of Finite-time thermodynamics. At first time the novel estimate of the minimal entropy production in a general-type heat exchange system with given heat load and fixed heat exchange surface is derived. The corresponding optimal distribution of heat exchange surface and optimal contact temperatures are also obtained. It is proven that if a heat flow is proportional to the difference of contacting flows’ temperatures then dissipation in a multi-flow heat exchanger is minimal only if the ratio of contact temperatures of any two flows at any point inside heat exchanger is the same and the temperatures of all heating flows leaving exchanger are also the same. Our result based on those assumptions: 1. heat transfer law is linear (17); 2. summary exchange surface is given; 3. heat load is given; 4. input tempretures for all flows are given; 5. water equivalents for all flows are given.

Ohmic and viscous damping of the Earth's Free Core Nutation

2021 ◽  
Author(s):  
Santiago Triana ◽  
Jeremy Rekier ◽  
Antony Trinh ◽  
Veronique Dehant ◽  
Ping Zhu
Keyword(s):  
Effective Viscosity ◽  
Inner Core ◽  
Extreme Values ◽  
Ohmic Heating ◽  
Outer Core ◽  
Viscous Damping ◽  
Asymptotic Regime ◽  
Free Core Nutation ◽  
Numerical Studies ◽  
Dissipation Processes

<p>The cause for the damping of the Earth's Free Core Nutation (FCN) and the Free Inner Core Nutation (FICN) eigenmodes has been a matter of debate since the earliest reliable estimations from nutation observations were made available. Numerical studies are difficult given the extreme values of some of the parameters associated with the Earth's fluid outer core, where important dissipation processes can take place. We present a linear numerical model for the FCN that includes viscous dissipation and Ohmic heating. We find an asymptotic regime, appropriate for Earth's parameters, where viscous and Ohmic processes contribute equally to the total damping, with the dissipation taking place almost exclusively in the boundary layers. By matching the observed nutational damping we infer an enhanced effective viscosity matching and validating methods from previous studies. We suggest that turbulence caused by the Earth's precession can be a source for the FCN's damping. </p>

Sign in / Sign up

Export Citation Format

Share Document