scholarly journals The Recent IAEA Environmental Transfer Parameter Handbooks and Contribution from Japan

2021 ◽  
Vol 56 (3) ◽  
pp. 123-132
Author(s):  
Shigeo UCHIDA ◽  
Keiko TAGAMI
Keyword(s):  
Author(s):  
C. P. Lee ◽  
J. C. Han

The effect of heat transfer on film cooling has been studied analytically. The proposed model shows that the non-adiabatic film cooling effectiveness will increase with increasing of the heat transfer parameter, Ū / (ρVCp)2, on the convex, the flat and the concave walls over the entire range of film cooling parameter, X/MS. On the convex wall with a blowing rate, M, of 0.51 and a heat transfer parameter of 10−3 at the typical engine conditions, the non-adiabatic effectiveness can be higher than the adiabatic effectiveness by 45% at a film cooling parameter of 103; while the film temperature can be lower than the adiabatic wall by 18°C (32°F) at a dimensionless distance of 500. The model can be extended and applied to the heat transfer analysis for any kind of turbine blade with film cooling.


Author(s):  
Jillian Moffatt ◽  
Georgios Tsiminis ◽  
Elizaveta Klantsataya ◽  
Ori Henderson-Sapir ◽  
Barnaby Smith ◽  
...  

2019 ◽  
Vol 16 ◽  
pp. 2135-2143
Author(s):  
M.H. Khan ◽  
R. Daud ◽  
M.K. Ali Hassan ◽  
A.F. Azizan ◽  
B. Izzawati ◽  
...  

2009 ◽  
Vol 100 (9) ◽  
pp. 757-766 ◽  
Author(s):  
Philippe Calmon ◽  
Yves Thiry ◽  
Gregor Zibold ◽  
Aino Rantavaara ◽  
Sergei Fesenko

1998 ◽  
Vol 1 (3) ◽  
pp. 175-176 ◽  
Author(s):  
FRANÇOIS GROSJEAN

Natascha Müller's proposal to view transfer as a relief strategy used by bilingual learners to cope with problematic input is very interesting and has far-reaching consequences for theories of bilingual language acquisition. The author makes a strong case for the fact that bilingual children transfer parameter values from the language presenting unambiguous input to the other “puzzling language”. In what follows, I will not question the main thrust of her argument. Rather I will return to the definitions that have been proposed for transfer in the literature and show that they are usually too broad. I will then propose that anyone interested in studying transfer must take into account the language mode the language learner or bilingual subject is in when being studied, and I will end by showing the consequences that this may have if it is not done. Natascha Müller's main argument is not affected by the language mode factor but the quantitative difference she finds between monolingual and bilingual children could be.


2021 ◽  
Vol 22 (2) ◽  
Author(s):  
Tim Wenzel ◽  
Henning Gieseler

AbstractRecent advances in molded vial manufacturing enabled manufacturers to use a new manufacturing technique to achieve superior homogeneity of the vial wall thickness. This study evaluated the influence of the different manufacturing techniques of molded vials and glass compositions on vial heat transfer in freeze-drying. Additionally, the influence of using empty vials as thermal shielding on thermal characteristics of edge and center vials was investigated. The vial heat transfer coefficient Kv was determined gravimetrically for multiple vial systems. The results showed superior heat transfer characteristics of the novel manufacturing technique as well as differences in heat transfer for the different glass compositions. Empty vials on the outside of the array did not influence center vial Kv values compared to a full array. The direct contact area and vial bottom curvature and their correlation to heat transfer parameters were analyzed across multiple vial systems. A new approach based on light microscopy to describe the vial bottom curvature more accurately was described. The presented results for the contact area allowed for an approximation of the pressure-independent heat transfer parameter KC. The results for the vial bottom curvature showed a great correlation to the pressure-dependent heat transfer parameter KD. Overall, the results highlighted how a thorough geometrical characterization of vials with known heat transfer characteristics could be used to predict thermal characteristics of new vial systems as an alternative to a time-consuming gravimetric Kv determination. Primary drying times were simulated to show the influence of Kv on drying performance.


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