Optimisation of various Thermodynamic Parameters for minimum Temperature Gradient along Cylinder Liner

2021 ◽  
pp. 1-20
Author(s):  
N. B. Totla ◽  
C. L. Prabhune ◽  
N. K. Sane
Keyword(s):  
Temperature Gradient ◽  
Thermodynamic Parameters ◽  
Minimum Temperature ◽  
Cylinder Liner

Study on Thermal Stresses of Cylinder Liner’s Fabrication Using FEM Analysis

2011 ◽  
Vol 189-193 ◽  
pp. 2058-2061
Author(s):  
Zi Qian Huang ◽  
Qing Lian Xie
Keyword(s):  
Temperature Gradient ◽  
Thermal Stresses ◽  
Cylinder Liner ◽  
Fem Analysis ◽  
Von Mises Stress ◽  
Surface Zone ◽  
Cooling Speed ◽  
Quality Of Products ◽  
Von Mises

In the process of casing casting, great temperature gradient leads to contraction deformation of cylinder liner, which influences the quality of products. The thermal stresses caused by temperature gradient were analyzed by finite element method. The numerical results show that high equivalent Von Mises stress(242MPa) occurs in the surface zone of the cylinder liner as Cooling down to room temperature within pipe die ,also there is plastic deformation in the internal and external surface zone. Reducing the cooling speed, decreasing the temperature gradient and aging can reduce the influence of thermal stresses.

scholarly journals Diferenças de temperatura mínima entre o abrigo meteorológico e a relva em noites com geadas

2018 ◽  
Vol 39 (6) ◽  
pp. 2337
Author(s):  
Nilson Aparecido Vieira Junior ◽  
Paulo Henrique Caramori ◽  
Marcelo Augusto de Aguiar e Silva ◽  
Pablo Ricardo Nitsche
Keyword(s):  
Temperature Gradient ◽  
Air Temperature ◽  
Temperature Difference ◽  
Minimum Temperature ◽  
Probability Distributions ◽  
Climate Conditions ◽  
Thermal Inversion ◽  
Average Temperature ◽  
Estimation Equations ◽  
Minimum Air Temperature

A phenomenon called thermal inversion, in which there is the accumulation of colder and denser air in the layers closer to the soil, occurs in radiative frost nights, resulting in a temperature gradient with differences between the meteorological screen and grass, which vary depending on cooling conditions. Knowing this temperature difference assists in taking preventive measures against radiative frosts, as well as in estimating the probability of their occurrences. In this context, this study aimed to verify the adjustment of different probability distributions to determine the differences between the minimum temperature measured in the meteorological screen and grass temperature below 0 °C for eight regions of the Paraná State, as well as the probability of occurring these differences and adjust estimation equations of grass temperature from minimum air temperature. Temperature differences between the screen and grass were calculated and probability distributions of their occurrences were adjusted in order to determine risks per intervals of temperature differences. Estimation equations of grass temperature were adjusted from minimum screen temperatures. Average gradients of minimum temperature were observed between the screen and grass ranging from 4.2 to 6.3 °C in the analyzed regions. The average temperature difference measured in the meteorological screen and grass for the Paraná State was 5 °C. The probabilistic model of normal distribution is the most suitable for determining the probability of occurring the differences between the screen and grass temperatures for the Paraná State. Regional relief and climate conditions influence the magnitude of the minimum temperature gradient measured in the meteorological screen and grass. Estimation equations can be useful to determine the grass temperature based on the minimum air temperature for periods in which there is no such data and thus provide a subsidy for studies of risk analysis of frosts. The results of this analysis are empirical and the equations should be used in regions in which they were adjusted aiming at a higher accuracy.

scholarly journals Self-Consistent Thermodynamic Parameters of Diopside at High Temperatures and High Pressures: Implications for the Adiabatic Geotherm of an Eclogitic Upper Mantle

Minerals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1322
Author(s):  
Chang Su ◽  
Dawei Fan ◽  
Jiyi Jiang ◽  
Zhenjun Sun ◽  
Yonggang Liu ◽  
...  
Keyword(s):  
Temperature Gradient ◽  
Thermodynamic Parameters ◽  
Upper Mantle ◽  
High Pressures ◽  
Potential Temperature ◽  
Theoretical Data ◽  
Adiabatic Temperature ◽  
Depth Range ◽  
Self Consistent ◽  
Adiabatic Temperature Gradient

Using an iterative numerical approach, we have obtained the self-consistent thermal expansion, heat capacity, and Grüneisen parameters of diopside (MgCaSi2O6) over wide pressure and temperature ranges based on experimental data from the literature. Our results agree well with the published experimental and theoretical data. The determined thermodynamic parameters exhibit nonlinear dependences with increasing pressure. Compared with other minerals in the upper mantle, we found that the adiabatic temperature gradient obtained using the thermodynamic data of diopside is larger than that of garnet while lower than that of olivine, when ignoring the Fe incorporation. Combining our results with thermodynamic parameters of garnet obtained in previous studies, we have estimated the adiabatic temperature gradient and geotherm of an eclogitic upper mantle in a depth range of 200–450 km. The results show that the estimated adiabatic temperature gradient of the eclogite model is ~16% and ~3% lower than that of the pyrolite model at a depth of 200 km and 410 km, respectively. However, the high mantle potential temperature of the eclogite model leads to a similar temperature as the pyrolite model in a depth range of 200–410 km.

Models of Thermodynamic Properties of Prominences

1979 ◽  
Vol 44 ◽  
pp. 349-355
Author(s):  
R.W. Milkey
Keyword(s):  
Thermodynamic Properties ◽  
Mass Transport ◽  
Emission Spectrum ◽  
Thermodynamic Parameters ◽  
Working Group ◽  
Physical Processes ◽  
Theoretical Concepts ◽  
Group 3 ◽  
Observational Techniques

The focus of discussion in Working Group 3 was on the Thermodynamic Properties as determined spectroscopically, including the observational techniques and the theoretical modeling of physical processes responsible for the emission spectrum. Recent advances in observational techniques and theoretical concepts make this discussion particularly timely. It is wise to remember that the determination of thermodynamic parameters is not an end in itself and that these are interesting chiefly for what they can tell us about the energetics and mass transport in prominences.

Technical Note. Influence of Material Used for the Regenerator on the Properties of a Thermoacoustic Heat Pump

2013 ◽  
Vol 38 (4) ◽  
pp. 565-570 ◽  
Author(s):  
Bartłomiej Kruk
Keyword(s):  
Heat Transfer ◽  
Temperature Gradient ◽  
Acoustic Wave ◽  
Heat Pump ◽  
Sound Wave ◽  
Heat Exchangers ◽  
Heat Pumps ◽  
Technical Note ◽  
New Materials ◽  
Modern Technologies

Abstract Research in termoacoustics began with the observation of the heat transfer between gas and solids. Using this interaction the intense sound wave could be applied to create engines and heat pumps. The most important part of thermoacoustic devices is a regenerator, where press of conversion of sound energy into thermal or vice versa takes place. In a heat pump the acoustic wave produces the temperature difference at the two ends of the regenerator. The aim of the paper is to find the influence of the material used for the construction of a regenerator on the properties of a thermoacoustic heat pump. Modern technologies allow us to create new materials with physical properties necessary to increase the temperature gradient on the heat exchangers. The aim of this paper is to create a regenerator which strongly improves the efficiency of the heat pump.

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