scholarly journals MODEL OF HEAT GENERATION DURING DEFORMATION OF MEDIA WITH INTERNAL STRESSES

2021 ◽  
Vol 1 (74) ◽  
pp. 62-64
Author(s):  
B. Zimin ◽  
A. Khitrina
Keyword(s):  
Energy Dissipation ◽  
Physical Properties ◽  
Heat Release ◽  
Heat Generation ◽  
Solid Body ◽  
Internal Stresses ◽  
Elastic Stage

Observations of a solid body with internal stresses have been carried out, this model allows us to describe the energy dissipation during the change of the elastic stage of deformation to the plastic one. The dependence of heat release on the heat physical properties of the contacting structures is noted.

In Operando Detection of the Physical Properties Change of the Interfacial Electrolyte during Li-Metal Electrode Reaction by Atomic Force Microscopy

2020 ◽  
Author(s):  
Mitsunori Kitta
Keyword(s):  
Atomic Force Microscopy ◽  
Energy Dissipation ◽  
Physical Properties ◽  
Electrode Surface ◽  
Electrode Reaction ◽  
Metal Electrode ◽  
Ion Concentration ◽  
Force Microscopy ◽  
Atomic Force ◽  
Discharge Reaction

This manuscript propose the operando detection technique of the physical properties change of electrolyte during Li-metal battery operation.The physical properties of electrolyte solution such as viscosity (η) and mass densities (ρ) highly affect the feature of electrochemical Li-metal deposition on the Li-metal electrode surface. Therefore, the operando technique for detection these properties change near the electrode surface is highly needed to investigate the true reaction of Li-metal electrode. Here, this study proved that one of the atomic force microscopy based analysis, energy dissipation analysis of cantilever during force curve motion, was really promising for the direct investigation of that. The solution drag of electrolyte, which is controlled by the physical properties, is directly concern the energy dissipation of cantilever motion. In the experiment, increasing the energy dissipation was really observed during the Li-metal dissolution (discharge) reaction, understanding as the increment of η and ρ of electrolyte via increasing of Li-ion concentration. Further, the dissipation energy change was well synchronized to the charge-discharge reaction of Li-metal electrode.This study is the first report for direct observation of the physical properties change of electrolyte on Li-metal electrode reaction, and proposed technique should be widely interesting to the basic interfacial electrochemistry, fundamental researches of solid-liquid interface, as well as the battery researches.

scholarly journals Discuss the abnormal exothermic phenomenon “ cold fusion “

2021 ◽  
Vol 261 ◽  
pp. 04020
Author(s):  
Yang Liu ◽  
DongJie Liu ◽  
JiaXing Zhao ◽  
Xin Lu
Keyword(s):  
Low Temperature ◽  
Heat Release ◽  
Isotope Effect ◽  
Heat Generation ◽  
Cold Fusion ◽  
Solution Model ◽  
Calculation Formula ◽  
Research Results ◽  
The Past ◽  
Charging Rate

The research on cold fusion phenomenon has been in the past 30 years. Based on the research results of the predecessors, this article comprehensively describes the research results of the predecessors on the cold fusion phenomenon, and discusses it theoretically and experimentally. From the perspective of thermodynamics, this paper proposes to charge the palladium wire with hydrogen at low temperature to increase the frequency of abnormal heat generation, and gives a calculation formula for the hydrogen charging rate of the palladium wire. At the same time, a theoretical solution model for the isotope effect on the abnormal heat release phenomenon is proposed.

scholarly journals Constructal design of isothermal X-shaped cavities

2014 ◽  
Vol 18 (2) ◽  
pp. 349-356 ◽  
Author(s):  
G. Lorenzini ◽  
C. Biserni ◽  
F.B. Link ◽  
Dos Santos ◽  
L.A. Isoldi ◽  
...  
Keyword(s):  
Heat Generation ◽  
Solid Body ◽  
Outer Surface ◽  
Area Fraction ◽  
Cavity Volume ◽  
Constructal Design ◽  
Conducting Wall ◽  
And Performance ◽  
Optimal Configurations ◽  
Better Than

This paper applies Constructal design to study the geometry of a X-shaped cavity that penetrates into a solid conducting wall. The objective is to minimize the maximal dimensionless excess of temperature between the solid body and the cavity. There is uniform heat generation on the solid body. The total volume and the cavity volume are fixed, but the geometric lengths and thickness of the X-shaped cavity can vary. The cavity surfaces are isothermal while the solid body has adiabatic conditions on the outer surface. The emerged optimal configurations and performance are reported graphically. When compared to the Y- and C- and H-, the X-shaped cavity performs approximately 53% better than the Y-shaped cavity and 68% better than the C-shaped cavity for the area fraction ? = 0.05, while its performance is 22% inferior to the performance of the H-shaped cavity for the area fraction ? = 0.1. The results indicate that the increase of the complexity of the cavity geometry can facilitate the access of heat currents and improve the performance of the cavities.

Investigation of dynamic heat generation and transfer behavior and energy dissipation for nonlinear synchronous belt transmission

2018 ◽  
Vol 144 ◽  
pp. 457-468 ◽  
Author(s):  
Wenbo Li ◽  
Xiaojie Zhang ◽  
Yuanyuan Shang ◽  
Qi Chen ◽  
Chunhua Chen ◽  
...  
Keyword(s):  
Energy Dissipation ◽  
Heat Generation ◽  
Transfer Behavior ◽  
Belt Transmission

Simulation of n-Heptane and Surrogate Fuels for Advanced Combustion Engines (FACE) in a Single-Cylinder Compression Ignition Engine

2013 ◽  
Author(s):  
Joseph Taglialegami ◽  
Gregory Bogin ◽  
Eric Osecky ◽  
Anthony M. Dean
Keyword(s):  
Diesel Engine ◽  
Physical Properties ◽  
Heat Release ◽  
Chemical Mechanism ◽  
Computational Time ◽  
Combustion Engines ◽  
Single Cylinder ◽  
Advanced Combustion ◽  
The Face ◽  
Single Chemical

A CFD model of a HATZ diesel engine was developed for the purpose of simulating low temperature combustion (LTC) of surrogate diesel fuels for the Fuels for Advanced Combustion Engines (FACE). Initial validation of the model was performed using n-heptane data from a single cylinder HATZ diesel engine. Simulations were run with both a detailed n-heptane mechanism and several reduced mechanisms to determine the suitability of using a reduced mechanism to capture the main ignition characteristics and emissions. It was found that a 173 species n-heptane mechanism predicts start of combustion (SOC) within 0.5 crank angle degrees of the detailed 561 species mechanism. The 173 species mechanism required 27 hours of computational time to reach the end of the simulation whereas the 561 species detailed mechanism required 41 hours under the same conditions. Two additional reduced mechanisms, containing 85 and 35 species, were provided reasonable accuracy with a computational time of 8 hours and 2 hours, respectively. Due to the varying physical and chemical properties of the FACE surrogates, a sensitivity analysis of the effects of the physical properties was conducted by changing the n-heptane physical properties to those of n-hexadecane while keeping the chemistry the same. As expected, when the fuel properties of n-hexadecane (which is less volatile than n-heptane) were used with the n-heptane kinetics, SOC was delayed and the net heat release rate was reduced. The FACE fuels were developed to fulfill the need for research grade fuels that are able to represent common refinery stream fuels. Since the FACE fuels consist of hundreds of fuel components, it is not feasible to model the actual FACE fuels in a full-scale engine model. An alternative is to develop surrogates consisting of relatively few species for which detailed mechanisms are available. Even then this mechanism would need to be reduced to make the computation practical. For this work, a detailed diesel surrogate mechanism was reduced from 4016 species to 1046 species to match the characteristics for FACE fuels 1, 3, 5, 8, and 9. The surrogates only contain 4–7 species. Using the single chemical mechanism to represent five surrogate FACE fuels, it was found that ∼200°C of air preheat was required to achieve autoignition in the HATZ model compared to the 130°C of air preheat required experimentally. Initial runs have found that there were similar trends in SOC and heat release between the FACE fuel surrogate experiments and simulations for the respective fuels. Future work will require improvements on the single chemical mechanism to represent the five surrogate FACE fuels.

Heat generation associated with pressure-induced infiltration in a nanoporous silica gel

2008 ◽  
Vol 23 (7) ◽  
pp. 1902-1906 ◽  
Author(s):  
Aijie Han ◽  
Venkata K. Punyamurtula ◽  
Yu Qiao
Keyword(s):  
Energy Dissipation ◽  
Temperature Variation ◽  
Temperature Change ◽  
Silica Gel ◽  
Heat Generation ◽  
Temperature Increase ◽  
Maximum Temperature ◽  
Nanoporous Silica ◽  
Sorption Behavior ◽  
Multiple Loading

As a liquid moves in the nanopores of a silica gel, because of the hysteresis of sorption behavior, significant energy dissipation can take place. Through a calometric measurement, the characteristics of associated heat generation are investigated. The temperature variation increases with the mass of silica gel, which consists of a reversible part and an irreversible part. The residual temperature change is about 30% to 60% of the maximum temperature increase and can be accumulated as multiple loading cycles are applied.

scholarly journals The influence of stress and strain on the physical properties of matter. Part I. Moduli of elasticity— continued . Relations between moduli of elasticity, thermal capacity, and other physical constants

1885 ◽  
Vol 38 (235-238) ◽  
pp. 488-500 ◽  
Keyword(s):  
Physical Properties ◽  
Young’S Modulus ◽  
Solid Body ◽  
Young's Modulus ◽  
Thermal Capacity ◽  
Stress And Strain ◽  
Physical Constants ◽  
The Mean ◽  
Moduli Of Elasticity

It has been proved by Wertheim, whose results have been verified by myself, that if e be taken to denote “Young’s Modulus,” and α the mean distance between the centres of any two adjacent molecules of a solid body, e x α 7 is, in the case of most metals, approximately a constant.

scholarly journals Influence of cement slurry heat release on physical properties of marine hydrate reservoirs during well cementing

2021 ◽  
Vol 228 ◽  
pp. 01017
Author(s):  
Mingming Zheng ◽  
Xiaoyu Wang ◽  
Zhilin Wang ◽  
Kerui Zhou ◽  
Kai Wang ◽  
...  
Keyword(s):  
Physical Properties ◽  
Heat Release ◽  
Oil And Gas ◽  
Two Dimensions ◽  
Cement Slurry ◽  
Saturation Zone ◽  
Gas Drilling ◽  
New Energy ◽  
Object Of Study ◽  
Hydrate Reservoirs

Natural gas hydrates gradually become the focus of new energy resources, and the study of hydrate exploitation is growing vigorously during recent years. Well cementing is an important process during energy exploitation, especially when encounters hydrate bearing sediments in deep-water oil and gas drilling, showing great research significance and becoming a research hotspot. In this study, the exploratory well of SH2 of GMGS-1 project is chosen as the object of study, a cementing model of two dimensions based on this exploratory well is build, the invasion process of cement slurry is reappeared by TOUGH+HYDRATE, and the physical properties response of hydrate reservoirs during the cementing process is analyzed based on the numerical simulation data. In which, a view of “continuous stage simulation” to solve the problem of dynamic heat release of cement slurry is created and used for the first time. Result illustrated that the invasion behavior of cement slurry almost only occurred during the stage of holding pressure, the temperature has significantly increased in the area of reservoir which is invaded by cement slurry. At the same time, a large amount of decomposed hydrate have generated gas and water, which form high pressure region and transfer toward the deeper of reservoir. However, the variation in the temperature is not significant and the hydrate barely no longer decomposed in those area which outside or even though close to this area. There also have generated secondary hydrate closed to the area of decomposition and formed high saturation zone of hydrate. The results also proved the feasibility of “continuous stage simulation”, and played a guiding significance for the field well cementing.

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