Computational Study of Chain Transfer to Monomer Reactions in High-Temperature Polymerization of Alkyl Acrylates

2013 ◽  
Vol 117 (12) ◽  
pp. 2605-2618 ◽  
Author(s):  
Nazanin Moghadam ◽  
Shi Liu ◽  
Sriraj Srinivasan ◽  
Michael C. Grady ◽  
Masoud Soroush ◽  
...  
Keyword(s):  
High Temperature ◽  
Chain Transfer ◽  
Computational Study ◽  
Alkyl Acrylates

scholarly journals Thermochemical Nonequilibrium in Rapidly Expanding Flows of High-Temperature Air

1997 ◽  
Vol 52 (4) ◽  
pp. 358-368 ◽  
Author(s):  
Michio Nishida ◽  
Masashi Matsumotob
Keyword(s):  
High Temperature ◽  
Vibrational Energy ◽  
Stokes Equations ◽  
Computational Study ◽  
Mass Conservation ◽  
Navier Stokes ◽  
Tvd Scheme ◽  
Governing Equations ◽  
Navier Stokes Equations ◽  
Free Jet

Abstract • This paper describes a computational study of the thermal and chemical nonequilibrium occuring in a rapidly expanding flow of high-temperature air transported as a free jet from an orifice into low-density stationary air. Translational, rotational, vibrational and electron temperatures are treated separately, and in particular the vibrational temperatures are individually treated; a multi-vibrational temperature model is adopted. The governing equations are axisymmetric Navier-Stokes equations coupled with species vibrational energy, electron energy and species mass conservation equations. These equations are numerically solved, using the second order upwind TVD scheme of the Harten-Yee type. The calculations were carried out for two different orifice temperatures and also two different orifice diameters to investigate the effects of such parameters on the structure of a nonequilibrium free jet.

scholarly journals Selective hydroformylation of alkyl acrylates using [2,2′-bis(dipyrrolylphosphinooxy)-1,1′-(±)-binaphthyl]/Rh catalyst: reversal of regioselectivity

RSC Advances ◽  
2017 ◽  
Vol 7 (24) ◽  
pp. 14816-14823 ◽  
Author(s):  
Xiao Shu ◽  
Haoran Liang ◽  
Qianhui Wu ◽  
Fanding Zhou ◽  
Xueli Zheng ◽  
...  
Keyword(s):  
High Temperature ◽  
Alkyl Acrylates ◽  
Alkyl Acrylate ◽  
Rh Catalyst

Deuterioformylation clarified the possible mechanism for the regioselectivity reversal of hydroformylation of alkyl acrylate at low and high temperature.

Experimental and Numerical Film Effectiveness Downstream a Row of Compound Angle Film Holes

2003 ◽  
Author(s):  
A. Khanicheh ◽  
M. E. Taslim
Keyword(s):  
High Temperature ◽  
Film Cooling ◽  
Computational Study ◽  
Cooling Effectiveness ◽  
Film Cooling Effectiveness ◽  
Single Row ◽  
Cooling Hole ◽  
Cylindrical Holes ◽  
Film Cooling Holes ◽  
Compound Angle

High component lifetimes of modern gas turbines can be achieved by cooling the airfoils effectively. Film cooling is commonly employed on the airfoils and other engine hot section surfaces in order to protect them from the high thermal stress fields created by exposure to combustion gases. Complex geometries as well as optimized cooling considerations often dictate the use of compound-angled film cooling hole. In the present experimental and computational study, the effects that two different compound angle film cooling hole injection configurations have on film cooling effectiveness are investigated. Film cooling effectiveness measurements have been made downstream of a single row of compound angle cylindrical holes with a diameter of 7.5 mm, and a single row of compound angle, diffuser-shaped holes with an inlet diameter of 7.5 mm. The cylindrical holes were inclined (α=25°) with respect to the coverage surface and were oriented perpendicular to the high-temperature airflow direction. The diffuser-shaped holes had a compound angle of 45 degrees with respect to the high temperature air flow direction and, similar to the cylindrical film holes, a 25-deg angle with the coverage surface. Both geometries were tested over a blowing ratio range of 0.7 to 4.0. Surface temperatures were measured along four longitudinal rows of thermocouples covering the downstream area between two adjacent holes. The results showed that the best overall protection over the widest range of blowing ratios was provided by the diffuser-shaped film cooling holes. Compared with the cylindrical hole results, the diffuser-shaped expansion holes produced higher film cooling effectiveness downstream of the film cooling holes, particularly at high blowing ratios. The increased cross sectional area at the shaped hole exit compared to that of the cylindrical hole lead to a reduction of the mean velocity, thus the reduction of the momentum flux of the jet exiting the hole. Therefore, the penetration of the jet into the main flow was reduced, resulting in an increased cooling effectiveness. A commercially available CFD software package was used to study film cooling effectiveness downstream of the row of holes. Comparisons between the experimentally measured and numerically calculated film effectiveness distributions showed that the computed results are in reasonable agreement with the measured results. Therefore, CFD can be considered as a viable tool to predict the cooling performance of different film cooling configurations in a parametric study. A more realistic turbulence model, possibly adopting a two-layer model that incorporates boundary layer anisotropy, in the computational study may improve the predicted results.

Effect of the Intramolecular Chain Transfer to Polymer on PLP/SEC Experiments of Alkyl Acrylates

2003 ◽  
Vol 12 (5) ◽  
pp. 315-324 ◽  
Author(s):  
Gurutze Arzamendi ◽  
Christophe Plessis ◽  
José R. Leiza ◽  
José M. Asua
Keyword(s):  
Chain Transfer ◽  
Alkyl Acrylates

Computational Study of the High Temperature Heat Transfer Coefficient for Different Cutting Fluids

2013 ◽  
Vol 19 (3) ◽  
pp. 726-730
Author(s):  
Wisansart Satana ◽  
Karuna Tuchinda ◽  
Anantawit Tuchinda ◽  
Surachet Chutima
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
High Temperature ◽  
Transfer Coefficient ◽  
Computational Study ◽  
Cutting Fluids ◽  
Temperature Heat
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