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thermodynamics

Hsiao-Wei Lee's picture

Dynamic Equilibrium Equations in Unified Mechanics Theory

Traditionally dynamic analysis is done using Newton’s universal laws of the equation of motion. According to the laws of Newtonian mechanics, the x, y, z, space-time coordinate system does not include a term for energy loss, an empirical damping term “C” is used in the dynamic equilibrium equation. Energy loss in any system is governed by the laws of thermodynamics. Unified Mechanics Theory (UMT) unifies the universal laws of motion of Newton and the laws of thermodynamics at ab-initio level.

Hsiao-Wei Lee's picture

Predicting high cycle and ultrasonic vibration fatigue with unified mechanics theory

The unified mechanics theory (UMT) is ab-initio unification of the second law of thermodynamics and Newton's universal laws of motion, in which Boltzmann's second law of entropy formulation governs dissipation & degradation. Hence, the unified mechanics theory does not require any empirical dissipation & degradation potential function or an empirical void evolution function. Material degradation is quantified on the Thermodynamic state index (TSI) axis based on the specific entropy production, which starts at zero and asymptotically approaches one at failure.

Hsiao-Wei Lee's picture

Modeling fatigue of pre-corroded metals with unified mechanics theory

The unified mechanics theory (UMT) was used to develop a model to predict the fatigue life of pre-corroded steel samples with BCC structure. Details of the experimental validation are also provided.

https://doi.org/10.1016/j.matdes.2022.111383

Mechanical Engineering HQ's picture

Using Solar Heat to Create Clean Drinking Water

Hello again iMechanica! My name is Ryan and I am the Founder of Mechanical Engineering HQ. I am writing today to share an interesting development in water sanitation technology. Scientists and engineers have developed a new solar powered water purifier that can create drinking water from wastewater and seawater. Read on to find out how they have achieved this!

Cemal Basaran's picture

Thermodynamics 2.0

Thermodynamics 2.0 Conference [online] has waived the registration fee.

The conference is about Thermodynamics in relation to other disciplines including Mechanics.

My talk on Wednesday at noon is about the Unification of Mechanics and Thermodynamics. 

https://iaisae.org/index.php/speakers/

 

Assistant Professors (tenure track) / Associate Professors in Mechanical Engineering, Department of Engineering, Aarhus University 979843

The Department of Engineering at Aarhus University has a number of open positions as Assistant Professor (tenure track) or Associate Professor at the Section of Mechanical Engineering. The University seeks innovative and visionary engineers/researchers capable of developing the research in Mechanical Engineering.

The positions are available from October 1, 2019 or as soon as possible hereafter.

Cemal Basaran's picture

Scientists report solving one of the oldest problems in mechanics

Being able to accurately predict the life span of physical bodies, both living and non-living, has been one of humankind’s eternal endeavors.  Over the last 150 years, many attempts were made to unify the field of Newtonian mechanics  and thermodynamics,  in order to create a generalized and consistent theory of evolution of life-span.

 

A ``small'' but interesting riddle from the theory of vibrations

A ``small'' but interesting riddle from the basic theory of vibrations. Haven't run into it in any physics/classical mechanics text/reference.

Learn fluid mechanics or thermodynamics ?

Choose a channel featured in the header of iMechanica: 
Cemal Basaran's picture

A Nobel Prize worthy paper, unifying Mechanics and Thermodynamics with a mathematical basis

I highly recommend this paper to any mechanician who is familiar with the scientific efforst in the last 150 years to unify mechanics and thermodynamics. Sosnoskiy and Sherbakov and several others from the Russian Academy of Sciences listed in the Acknowledgemnsts have achieved it. Congratulations.

Sosnovskiy, L. Sherbakov, S.,”Mechanothermodynamic Entropy and Analysis of Damage State of Complex Systems”, Entropy, 2016, 18, 268.

Cemal Basaran's picture

A Nobel prize worthy paper, unifying Mechanics and Thermodynamics with a Mathematical Basis

I highly recommend this paper to any mechanician who is familiar with the scientific efforst in the last 150 years to unify mechanics and thermodynamics. Sosnoskiy and Sherbakov and several others from the Russian Academy of Sciences listed in the Acknowledgemnsts have achieved it. Congratulations.

Sosnovskiy, L. Sherbakov, S.,”Mechanothermodynamic Entropy and Analysis of Damage State of Complex Systems”, Entropy, 2016, 18, 268.

Assistant Professors / Associate Professors in Mechanical Engineering 825559

Department of Engineering (ENG), Aarhus University (AU) invites applications for a number of positions as tenure track assistant professors or associate professors in the field of Mechanical Engineering (ME). The University has ambitious plans to increase its activities significantly within research and education as well as public and industrial collaboration with the vision of bringing AU into the global engineering elite.

Zhigang Suo's picture

Masters of Thermodynamics

One Internet, multiple worlds.  People have gone mobile, but iMechanica has not.  Although iMechanica is accessible from mobile phones, but it was not designed as such.  On the other hand, mobile social networks are good mostly for short forms.  A practical solution seems to be posting on iMechanica and linking the entries to social networks, such as twitter, wechat, and Facebook.  For example, The New Yorker has a strong presence on Facebook, as my sons and their friends would say.   

Zhigang Suo's picture

Fossil-fueled civilization

I'll be teaching an undergraduate course on engineering thermodynamics.  We will use the textbook by Cengel and Boles.  I will supplement the textbook using my own notes on thermodynamics.

Guanchu Cheng's picture

thermodynamics equilibrium state vs. steady state???

I am not clear about two concepts: thermodynamics equilibrium state and steady state. It's easy to conceive of the following different two osmosis processes regarding thermodynamics equilibrium state and steady state, respecitvely.

Zhigang Suo's picture

Freely jointed chain

A single strand of polymer is a chain of a large number of monomers.  The monomers are joined by covalent bonds, and two bonded monomers may rotate relative to each other.  At a finite temperature, the polymer rapidly changes from one configuration to another.  When the two ends of the polymer are pulled by a force, the distance between the two ends changes.  The polymer is known as an entropic spring.

Mubeen's picture

Physical Foundations of Continuum Mechanics

After many publications and lecture notes, Prof. Ian Murdoch has finally organized much of that material in the form of a book.

I am very hopeful that like Prof. Murdoch's lectures, this monograph will also help the readers to develop a better understanding of the physical aspects of mechanics. It will be a valuable addition to the researchers' personal collection. 

Link:

http://www.cambridge.org/gb/knowledge/isbn/item6828574

more details in the flyer attached.

Zhigang Suo's picture

Empirical observations of temperature

I have divided the old notes on temperature into three parts:

Our feeling of hotness comes from everyday experiences. These experiences indicate that many levels of hotness exist, and that all levels of hotness can be mapped to a real variable.

Zhigang Suo's picture

Energy

Andrew Bunger's picture

Postdoctoral Fellow - Geomechanical Modelling, Perth, Australia

CSIRO division of Earth Science and Resource Engineering is seeking a Postdoctoral Fellow to develop a coupled Thermo-Hydro-Chemo-Mechanical (THCM) reservoir model for application to Engineered Geothermal Systems. To read the position details and to apply please visit this link: http://csiro.nga.net.au/?jobID=2aac9739-a118-8730-e510-64c65b15c683&audienceTypeCode=INT&appJobAd=1

 

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