scholarly journals Internal energy change and activation energy effects on Casson fluid

AIP Advances ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 025009 ◽  
Author(s):  
T. Salahuddin ◽  
Nazim Siddique ◽  
Maryam Arshad ◽  
I. Tlili
Keyword(s):  
Activation Energy ◽  
Internal Energy ◽  
Casson Fluid ◽  
Energy Change

scholarly journals Thermophyical properties and internal energy change in Casson fluid flow along with activation energy

2020 ◽  
Vol 11 (4) ◽  
pp. 1355-1365 ◽  
Author(s):  
T. Salahuddin ◽  
Maryam Arshad ◽  
Nazim Siddique ◽  
A.S. Alqahtani ◽  
M.Y. Malik
Keyword(s):  
Activation Energy ◽  
Fluid Flow ◽  
Internal Energy ◽  
Casson Fluid ◽  
Energy Change

SEARCH FOR THE TRANSITION POINT AND DEDUCTION OF THE ORDER OF PHASE TRANSITIONS—APPLICATION OF THE MICROCANONICAL SIMULATION METHOD WITH FRICTION TERMS

1990 ◽  
Vol 05 (03) ◽  
pp. 515-530
Author(s):  
YOSHITOMI MORIKAWA
Keyword(s):  
Phase Transitions ◽  
Internal Energy ◽  
Transition Point ◽  
Simulation Method ◽  
Energy Change ◽  
Gauge Model ◽  
First Order ◽  
First Order Phase

We apply the microcanonical simulation method with friction terms to deduce the order of phase transitions by examining the existence of the S-shaped curve in the internal energy-temperature diagram. We study the dependence of the S-shape on a parameter of energy change by using a gauge model, and determine the location of the transition point. We further consider the possibility of finding out weak first-order phase transitions. We also explain several features in the method and remark a condition on the parameter for a reasonable simulation.

scholarly journals Finite Element Study of Magnetohydrodynamics (MHD) and Activation Energy in Darcy–Forchheimer Rotating Flow of Casson Carreau Nanofluid

Processes ◽  
2020 ◽  
Vol 8 (9) ◽  
pp. 1185 ◽  
Author(s):  
Bagh Ali ◽  
Ghulam Rasool ◽  
Sajjad Hussain ◽  
Dumitru Baleanu ◽  
Sehrish Bano
Keyword(s):  
Activation Energy ◽  
Finite Element ◽  
Brownian Motion ◽  
Physical Nature ◽  
Casson Fluid ◽  
Rotating Flow ◽  
Differential Problem ◽  
Slowing Down ◽  
Carreau Nanofluid ◽  
Finite Element Procedure

Here, a study for MHD (magnetohydrodynamic) impacts on the rotating flow of Casson Carreau nanofluids is considered. The temperature distribution is associated with thermophoresis, Brownian motion, and heat source. The diffusion of chemically reactive specie is investigated with Arrhenius activation energy. The governing equations in the 3D form are changed into dimensionless two-dimensional form with the implementation of suitable scaling transformations. The Variational finite element procedure is harnessed and coded in Matlab script to obtain the numerical solution of the coupled non-linear partial differential problem. The variation patterns of Sherwood number, Nusselt number, skin friction coefficients, velocities, concentration, and temperature functions are computed to reveal the physical nature of this examination. It is seen that higher contributions of the magnetic force, Casson fluid, and rotational fluid parameters cause a raise in the temperature like thermophoresis and Brownian motion does but also causes a slowing down in the primary as well as secondary velocities. The FEM solutions show an excellent correlation with published results. The current study has significant applications in the biomedical, modern technologies of aerospace systems, and relevance to energy systems.

Stability of the Pd-Co-Ni-Cu-P Metallic Glasses

2007 ◽  
Vol 1048 ◽  
Author(s):  
Daisuke Fukamaki ◽  
Tsunehiro Takeuchi ◽  
Masashi Hasegawa ◽  
Kazuo Soda ◽  
Hirokazu Sato ◽  
...  
Keyword(s):  
Activation Energy ◽  
Thermal Analysis ◽  
Free Energy ◽  
Electronic Structure ◽  
Metallic Glass ◽  
Internal Energy ◽  
Metallic Glasses ◽  
Photoemission Spectroscopy ◽  
First Principle ◽  
Cluster Calculations

AbstractStability of Pd-Co-Ni-Cu-P metallic glass was investigated in terms of free energy using first principle cluster calculations, thermal analysis, and photoemission spectroscopy measurements. We found that the internal energy of the Pd-based metallic glasses is dominated by the electronic structure near the Fermi level. The analyses on the electronic structure and local atomic arrangements indicate that the substitution of cobalt or a hypothetical atom Co0.5Cu0.5 for nickel in the Pd40Ni40P20 metallic glass decreases the free energy of the Pd-Ni-P metallic glass by increasing entropy without altering significantly internal energy. On the basis of the idea mentioned above, we prepared Pd28Co24Ni24P24, Pd25Co25Ni25P25 and Pd40Co40/3Ni40/3Cu40/3P20 metallic glasses. These metallic glasses certainly showed the nearly highest TX, which directly reflect the activation energy against crystallization, among the Pd-based metallic glasses ever reported.

Study on Mechanically Activated Dioscorea Fiber and Analysis of Activation Energy

2020 ◽  
Vol 984 ◽  
pp. 168-173
Author(s):  
Xiang Li Long ◽  
Yan Sheng Li ◽  
Qing Yan Liang ◽  
Mei Lin Chen ◽  
Hong Gao
Keyword(s):  
Activation Energy ◽  
Mechanical Activation ◽  
Internal Energy ◽  
Functional Groups ◽  
Fine Particles ◽  
Amorphous State ◽  
Fine Powder ◽  
Planetary Mill ◽  
Before And After ◽  
Ft Ir

Microtopography of fiber of Discorea nipponica Makino before and after mechanical activated by AGO-2 planetary mill was observed by SEM, and they changed the thick floccules to fine particles (D50 particle sizes were 10.18μm). Discorea fiber powder after mechanical activation had a narrow size distribution. According to XRD, the granularity and structures of discorea fiber with and without mechanical activation significantly differed, and the crystalline of discorea fiber was significantly converted into amorphous state after mechanical activation. On the basis of TG–DSC analysis, the activity of discorea fiber was enhanced, and certain internal energy were stored, and complete decomposition in advance. According to FT-IR, none of the functional groups of the mechanically activated discorea fiber disappeared, and no new functional groups appeared, which indicate that mechanical activation does not induce a chemical transformation of discorea fiber. According to the activation energy analysis, the thermal activation energy of dioscorea fiber after mechanical activation was18.49 kJ•mol, and the mechanical transfer activation energy was 56.06 kJ•mol, indicating that about 1/3 of the mechanical transfer activation energy was stored in the activated dioscorea fiber fine powder in the form of surface energy and internal energy.

scholarly journals Kinetics Study of Thermal Degradation of Resin Derived from Salicylaldehyde, Ethylenediamine and Formaldehyde

2010 ◽  
Vol 7 (2) ◽  
pp. 564-568 ◽  
Author(s):  
Dhanraj. T. Masram ◽  
N. S. Bhave ◽  
K. P. Kariya
Keyword(s):  
Activation Energy ◽  
Thermal Stability ◽  
Free Energy ◽  
Thermal Degradation ◽  
Frequency Factor ◽  
Entropy Change ◽  
Energy Change ◽  
Kinetics Study ◽  
Degradation Studies ◽  
Kinetics Of

The present paper reports the synthesis and kinetics of thermal degradation studies of resin salicylicldehyde -ethylenediamine -formaldehyde (SdEDF) derived by the condensation of salicylicldehyde and ethylenediamine with formaldehyde in the presence of catalyst hydrochloric acid in 1:1:2 molar proportions of reactants. Detailed thermal degradation studies of the SdEDF resin has been carried out to ascertain its thermal stability. Thermal degradation curve has been discussed in order to determine their mode of decomposition, order of reaction, apparent activation energy, frequency factor, free energy change, entropy change, and apparent energy change. Freeman - Carroll and Sharp- Wentworth methods have been applied for the calculation of kinetic parameters while the data from the Freeman - Carroll methods have been used to determine various thermodynamic parameters.

Formation of C60− and C70− by free electron capture. Activation energy and effect of the internal energy on lifetime

1994 ◽  
Vol 226 (1-2) ◽  
pp. 213-218 ◽  
Author(s):  
Thomas Jaffke ◽  
Eugen Illenberger ◽  
Mathias Lezius ◽  
Stefan Matejcik ◽  
David Smith ◽  
...  
Keyword(s):  
Activation Energy ◽  
Internal Energy ◽  
Electron Capture ◽  
Free Electron

A bio-convective investigation for flow of Casson nanofluid with activation energy applications

2021 ◽  
pp. 095765092110393
Author(s):  
Fazal Haq ◽  
Muzher Saleem ◽  
M Ijaz Khan ◽  
Sami Ullah Khan ◽  
Mohammed Jameel ◽  
...  
Keyword(s):  
Activation Energy ◽  
Numerical Data ◽  
Casson Fluid ◽  
Surface Drag ◽  
Gyrotactic Microorganisms ◽  
Shooting Technique ◽  
Transfer Rates ◽  
Constitutive Theories ◽  
Energy Applications ◽  
Buoyancy Forces

Here theoretical analysis of heat, mass and motile microorganisms transfer rates in Casson fluid flow over stretched permeable surface of cylinder is studied. Investigated is carried out in the presence of suspended nanoparticles and self-propelled gyrotactic microorganisms. The effects of buoyancy forces, magnetic field and thermal radiation are considered. The nanoparticles with suitable suspension are stabilized through mutual effects of buoyancy forces and bioconvection. Furthermore, activation energy and Darcy- Forchheimer effects on bio nanofluid flow are accounted. The constitutive theories are executed to develop the model formulation. The obtained model is made dimensionless trough appropriate transformations. The dimensionless flow model is tackled by built-in algorithm of shooting technique. Impact of flow controlling constraints parameters is physically elaborated by making graphical illustrations. The outcomes based on numerical data against essential engineering formulations like surface drag force, Nusselt, density and Sherwood numbers are tabulated. Main outcomes are successfully summarized in terms of closing remarks.

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