Effect of Conjugated Heat Transfer Conditions on the Crystallization of the Composite Coating

2016 ◽  
Vol 685 ◽  
pp. 389-393
Author(s):  
Maria A. Anisimova
Keyword(s):  
Heat Transfer ◽  
Heat Exchange ◽  
Thermal Resistance ◽  
Composite Coating ◽  
Imperfect Contact ◽  
Thermophysical Model ◽  
Conjugated Heat Transfer

This paper presents the thermophysical model of crystallization of the coating at the conditions of imperfect contact between the coating and sunstrate. The model takes into account the heat exchange of coating with the environment and with the substrate. The influence of thermal resistance of the interface and concentration of filler in the coating on the change of temperature during cooling is investigated.

scholarly journals HEAT EXCHANGE IN THE AREA OF SURFACE CONTACT WITH SHAPE DEVIATIONS

2021 ◽  
Vol 4 (4) ◽  
pp. 64-69
Author(s):  
Viktor Popov ◽  
Olga Dornyak ◽  
Andrei Latinin ◽  
Elena Lushnikova
Keyword(s):  
Heat Transfer ◽  
Heat Exchange ◽  
Thermal Resistance ◽  
Transfer Process ◽  
Thermal Model ◽  
Composite System ◽  
Rough Surfaces ◽  
Heat Transfer Process ◽  
Contact Thermal Resistance ◽  
Contact Surfaces

The article discusses a thermal model of the heat transfer process in a composite system with contacting metal surfaces with macrodeviations in the form of bulges. It is shown that the previously developed methods for calculating contact thermal resistances are suitable only for contact pairs with flat-rough surfaces. For the considered contact pairs, when deriving analytical dependences, it is necessary to take into account the effect of equivalent non-flatness, the presence of which significantly increases the contact thermal resistance, which requires taking into account the influence of deviations in the shape of the contact surfaces in the process of designing heat-stressed systems.

The Effect of Regulating Elements on Convective Heat Transfer along Shaped Heat Exchange Surfaces

2013 ◽  
Vol 34 (1) ◽  
pp. 5-16 ◽  
Author(s):  
Jozef Cernecky ◽  
Jan Koniar ◽  
Zuzana Brodnianska
Keyword(s):  
Heat Transfer ◽  
Heat Exchange ◽  
Cfd Simulation ◽  
Local Heat Transfer ◽  
Local Heat ◽  
Temperature Fields ◽  
Transfer Coefficients ◽  
Heat Transfer Intensification ◽  
Heat Transfer Coefficients ◽  
Forced Air

Abstract The paper deals with a study of the effect of regulating elements on local values of heat transfer coefficients along shaped heat exchange surfaces with forced air convection. The use of combined methods of heat transfer intensification, i.e. a combination of regulating elements with appropriately shaped heat exchange areas seems to be highly effective. The study focused on the analysis of local values of heat transfer coefficients in indicated cuts, in distances expressed as a ratio x/s for 0; 0.33; 0.66 and 1. As can be seen from our findings, in given conditions the regulating elements can increase the values of local heat transfer coefficients along shaped heat exchange surfaces. An optical method of holographic interferometry was used for the experimental research into temperature fields in the vicinity of heat exchange surfaces. The obtained values correspond very well with those of local heat transfer coefficients αx, recorded in a CFD simulation.

Lime salts: origin and control in beet processing

2020 ◽  
pp. 282-287
Author(s):  
Jan Maarten de Bruijn
Keyword(s):  
Heat Transfer ◽  
Heat Exchange ◽  
Performance Indicator ◽  
Key Performance Indicator ◽  
Process Measures ◽  
Trouble Shooting ◽  
Important Chemical ◽  
And Control ◽  
Affect Processing ◽  
White Sugar

Lime salts in the thin juice obtained after juice purification is one of the most important chemical KPI’s (Key Performance Indicator) in beet processing. Too high lime salts content will significantly affect processing costs – particularly energy – due to scaling of heat exchange surfaces thus decreasing heat transfer. In addition, high lime salts are at the origin of turbidity and insoluble solids in white sugar. Therefore, it is of the utmost importance to understand the chemistry behind lime salts in beet processing in order to be able preventing too high lime salts contents in thin juice. This paper will explain the details of the chemistry behind the presence of lime salts. Further, a trouble-shooting guide is included to elucidate the different causes for high lime salts contents and how these causes can be identified, as well as the process measures to reduce the lime salts content in thin juice.

scholarly journals Fundamental limitations of the mode temperature concept in strongly coupled systems

2020 ◽  
Vol 75 (8) ◽  
pp. 803-807
Author(s):  
Svend-Age Biehs ◽  
Achim Kittel ◽  
Philippe Ben-Abdallah
Keyword(s):  
Heat Transfer ◽  
Heat Exchange ◽  
Strong Coupling ◽  
Quantum Systems ◽  
Coupled Systems ◽  
Strong Coupling Limit ◽  
Strongly Coupled ◽  
Fundamental Limitations ◽  
Temperature Concept ◽  
Vacuum Gap

AbstractWe theoretically analyze heat exchange between two quantum systems in interaction with external thermostats. We show that in the strong coupling limit the widely used concept of mode temperatures loses its thermodynamic foundation and therefore cannot be employed to make a valid statement on cooling and heating in such systems; instead, the incorrectly applied concept may result in a severe misinterpretation of the underlying physics. We illustrate these general conclusions by discussing recent experimental results reported on the nanoscale heat transfer through quantum fluctuations between two nanomechanical membranes separated by a vacuum gap.

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