Surface Temperature Of Parts Research Articles

Development of a fiber-optic probe for thermographic phosphor measurements in turbine engines

A laser-based system for remotely measuring the surface temperature of parts coated with thermographic phosphor (Y 2O 3:Eu) is described. The obtained temperature-decay lifetime calibration measurements and empirical fits for Y 2O 3:Eu ( 4.52% Eu) over the temperature range 200–1000 °C are presented. In addition, the results of a proof-of-principle test conducted on a stationary coupon coated with Y 2O 3:Eu immersed in an atmospheric-combustor, chamber are described. Furthermore, a design of a fiber optic probe for fluorescence decay lifetime measurements within turbine engines is presented. A surfacedamage threshold of ~3.5 J/cm 2 ( 266 nm/4–6 ns pulse width) was measured for the fused silica step-index optical fiber used.

Thermal contact resistance in injection molding

AbstractThis paper describes a method for obtaining the thermal contact resistance (TCR) between an injection molded part and its mold. Due to the absence of TCR the simulated cooling times obtained from Polycool II, a computer aided engineering (CAE) package for cooling simulation of injection molding, have compared poorly with both field and experimental data. This paper shows that an improvement in the accuracy of the simulated data results from making TCR an Input to Polycool II. TCR was obtained through a combination of experimental and analytical procedures. Experimental work was performed to obtain the part surface temperature distribution and the inside cavity pressure gradient. The part surface temperature distribution was then used as a boundary condition in the thermal analysis. The inside cavity pressure gradient was utilized as a basis for determining the inside cavity shrinkage. The results show that due to the thermal expansion of thermoplastics, the compressibility of the plastic melt, and the mold deformation, the inside cavity shrinkage is reduced as the thickness of the part is increased. Therefore, the TCR value of a thicker part is lower than that of a thinner part. The effects of both part thickness and process parameters, such as temperature and pressure, on TCR are also discussed.

抄紙機ドライパートの湿紙乾燥に関する理論的解析の問題点に対する若干の考察と高速抄紙機における湿紙乾燥の実際的な考察 ＩＩ

There exist very few reports or studies for the purpose of improving quality of final products, efficiency and operation by measuring and analyzing tendency of paper drying on dryer part actually operated wide and high speed paper machine. This is mainly because the higher the paper machine speed, the measurement of dryer part increase the possibility of production loss and is also more hazardous from safety stand point. I have measured moisture content distribution in each pocket of dry part and dryer surface temperature under special countermeasures against above mentioned difficulties and have investigated influences of so-called “chimney” and “ventury” effect together with relation to the uneven drying of products, of which results are presented in this paper. I have found unexpectedly high non uniform moisture and temperature profile in case of canvas air system dryer. The fact that cross machine moisture profile in the pockets of wet and dryers is not uniform, easily causes uneven drying which is impossible to be corrected by the subsequent dryers. Dryer surface temperature is high on back side because drying steam has too much superheat. “Chimney” and “ventury” effects have no negligible influence and I have been able to confirm many facts which hitherto were only conjectures. This measurement was executed on a paper machine of 6, 960 mm wire width and 650 m/min. operating speed. The measuring method was as shown in fig. 9.