Polishing and Honing Processes: An Investigation of the Thermal Properties of Mixtures of Polyborosiloxane and Silicon Carbide Abrasive

1996 ◽  
Vol 210 (3) ◽  
pp. 255-265 ◽  
Author(s):  
A J Fletcher ◽  
A Fioravanti
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Silicon Carbide ◽  
Thermal Properties ◽  
Empirical Models ◽  
Surface Heat ◽  
Transfer Processes ◽  
Surface Heat Transfer Coefficient ◽  
Semi Empirical

The passage of an ultrasonic wave through a mixture of polyborosiloxane and silicon carbide abrasive, when used in a honing process, causes heating due to the attenuation of the said wave. This is critical to the honing process since the temperature in the components being treated must be limited to about 70° C. A numerical model of the heat generation and transfer processes in the polishing medium is being formulated, which requires knowledge of the thermophysical properties of the mixture. This investigation concentrates on the experimental determination of thermal conductivity, specific heat capacity and surface heat transfer coefficient for various mixtures of polyborosiloxane and silicon carbide abrasive. Theoretical, semi-empirical and empirical models are derived for the variation of these thermal properties as functions of both material composition and temperature.

Thermal Tomography Using Experimental Measurement Data

2013 ◽  
Author(s):  
Jussi M. Toivanen ◽  
Ville Kolehmainen ◽  
Tanja Tarvainen ◽  
Janne Huttunen ◽  
Tuomo Savolainen ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Heat Capacity ◽  
Heat Transfer Coefficient ◽  
Experimental Measurement ◽  
Measurement Data ◽  
Surface Heat ◽  
Thermal Tomography ◽  
Surface Heat Transfer Coefficient ◽  
Air Hole

Experimental measurement data is used to test the feasibility of thermal tomography. The 3D distributed thermal conductivity, heat capacity and surface heat transfer coefficient of a mortar target containing an air hole are estimated using measurement data obtained with a prototype thermal tomography measurement device.

scholarly journals Influence of Material Coating on the Heat Transfer in a Layered Cu-SiC-Cu Systems

2017 ◽  
Vol 62 (2) ◽  
pp. 1311-1314
Author(s):  
A. Strojny-Nędza ◽  
K. Pietrzak ◽  
M. Teodorczyk ◽  
M. Basista ◽  
W. Węglewski ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Silicon Carbide ◽  
Thermal Properties ◽  
High Temperature ◽  
Vapour Deposition ◽  
Chemical Vapour ◽  
Plasma Sintering ◽  
Metal Ceramic ◽  
Spark Plasma

AbstractThis paper describes the process of obtaining Cu-SiC-Cu systems by way of spark plasma sintering. A monocrystalline form of silicon carbide (6H-SiC type) was applied in the experiment. Additionally, silicon carbide samples were covered with a layer of tungsten and molybdenum using chemical vapour deposition (CVD) technique. Microstructural examinations and thermal properties measurements were performed. A special attention was put to the metal-ceramic interface. During annealing at a high temperature, copper reacts with silicon carbide. To prevent the decomposition of silicon carbide two types of coating (tungsten and molybdenum) were applied. The effect of covering SiC with the aforementioned elements on the composite’s thermal conductivity was analyzed. Results were compared with the numerical modelling of heat transfer in Cu-SiC-Cu systems. Certain possible reasons behind differences in measurements and modelling results were discussed.

Determination of the surface heat-transfer coefficient in CE

2009 ◽  
Vol 30 (5) ◽  
pp. 910-920 ◽  
Author(s):  
Vlastimil Hruska ◽  
Christopher J. Evenhuis ◽  
Rosanne M. Guijt ◽  
Miroslav Macka ◽  
Bohuslav Gas ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Surface Heat ◽  
Surface Heat Transfer ◽  
Surface Heat Transfer Coefficient

scholarly journals A Convenient Method for the Accurate Calculation of Fin Efficiency of H-Type Fins Based on Linear Nomograms and Fitting Formulae

Energies ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 456
Author(s):  
Yongshi Feng ◽  
Xin Wu ◽  
Cai Liang ◽  
Zhongping Sun
Keyword(s):  
Heat Transfer ◽  
Experimental Data ◽  
Thermal Conductivity ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Surface Heat ◽  
Surface Heat Transfer ◽  
Fin Efficiency ◽  
Surface Heat Transfer Coefficient ◽  
Fin Thickness

Fin efficiency, as a measure of the effectiveness of the heat transfer enhancement, is of great importance in studying the heat transfer performance of H-type finned tube banks. The fin efficiency of square fins is adopted by most researchers as an alternative to that of H-type fins, which can create certain errors in the fin efficiency of H-type fins. For this paper, the linear nomograms and fitting formulae of fin efficiency of H-type fins are obtained by the definition method of fin efficiency based on numerous numerical simulations, and the results calculated by this method are verified by experimental data. On this basis, the effects of three geometric parameters (slit width, fin height, and fin thickness) and two thermal parameters (surface heat transfer coefficient and fin thermal conductivity) on the fin efficiency of H-type fins are also investigated and compared to those of square fins. The results indicate that the fin efficiency of H-type fins increases with the increment of fin thickness and thermal conductivity, and decreases with the increase of slit width, fin height, and surface heat transfer coefficient. Accordingly, the linear nomograms and fitting formulae for the fin efficiency of H-type fins, which are well compatible with experimental data, can help to facilitate further theoretical research and engineering application.

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