Results 251 to 260 of about 443,894 (309)
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Effects of flow on polymeric reaction
Polymer Engineering & Science, 2002AbstractThe esterification of the maleic anhydride residue (MA) in a hydrogenated styrene‐butadiene‐styrene block copolymer (SEBS‐g‐MA) with a polycaprolactone diol (PCL) was carried out in a melt. Experiments in static melts found that the reaction had an induction period followed by a rapid consumption of the reactants.
I‐Kuan Yang, Jyh Dar Lin
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Effective dimensions and chemical reactions in fluid flows
Physical Review E, 2007We show that chemical activity in hydrodynamical flows can be understood as the outcome of three basic effects: the stirring protocol of the flow, the local properties of the reaction, and the global folding dynamics which also depends on the geometry of the container.
György, Károlyi, Tamás, Tél
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Flow effects in the polymer cyclization reaction
Macromolecular Theory and Simulations, 1997AbstractWe investigate the effect of shear and uniaxial extensional flows on the rate of the cyclization reaction in polymers. We find that for such an intramolecular diffusion‐controlled reaction the flow always reduces the reaction rate, in contrast to the previously studied case of intermolecular reactions, where linear flows enhance the reaction ...
Alexander Kolb +2 more
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Micromixing effects on a parallel reaction in flow reactors
Chemical Engineering & Technology, 1993AbstractUsing the micromixing concepts of Danckwerts and Zwietering, the Peclet number Pe has been correlated mathematically to the degree of segregation J for the axial dispersion model. The results were applied to compare the micromixing effects on a model, mixed‐order parallel reaction system in continuous flow reactors.
Muhammad Atiqullah +2 more
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Effects of Transport on Reactions in Homogeneous Tubular Flow
Industrial & Engineering Chemistry Research, 2006Numerical solutions have been carried out for representative conditions in a tubular reactor in fully developed laminar and turbulent flow. The computations are unique in two respects. First, they take into account the radial transport of both species and energy by molecular and turbulent fluctuations for the combination of energetic reactions and heat
Stuart W. Churchill, Bo Yu
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Effects of the shear flow on a homogeneous polymeric reaction
Journal of Applied Polymer Science, 2006AbstractThe reaction kinetics of the postamidation of polyamide 6 in the melt was studied by a new rheological method, and the reaction rate constant was calculated to be about 0.087 kg/mol min at 250°C. To study the effects of the shear flow on a homogeneous polymeric reaction, a more practical technique was used to select the data that responded only
Fan Xie, Chixing Zhou, Wei Yu
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Flow effects on the kinetics of a second-order reaction
Chemical Engineering Journal, 2008Flow effects on the kinetics of an isothermal, equimolar, second-order reaction taking place in a channel were investigated using a Lagrangian numerical method. The reactants were released instantaneously from the two opposite walls of the channel into fully developed turbulent or laminar flow.
Kien T. Nguyen +1 more
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The Effect of Reaction on Axial Flow Compressor Performance
Volume 1: Turbomachinery, 1994This paper describes a study of the effects of design-point reaction on axial flow compressor performance. Particular attention is given to differences in stable operating range and overall efficiency. Design of an 80% reaction, zero pre-whirl, blading is presented together with a discussion on the applicability of currently available design ...
C. D. Farmakalides +2 more
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The effect of oscillatory flow on the release reaction and aggregation of human platelets
Microvascular Research, 1976Abstract The effect of variable shear rate on the thrombin-induced release of [ 14 C]serotonin from human platelets was investigated by subjecting washed suspensions containing 5 × 10 5 cells/μl to laminar oscillatory flow at 37°C in 1-meter lengths of 1.57-mm polyethylene tubing.
H L, Goldsmith, J C, Marlow, S K, Yu
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Effectiveness of Reaction Control System in Hypersonic Rarefied Reactive Flow
Journal of Spacecraft and Rockets, 2022The present study completes the simulation of a Terminal High Altitude Area Defense–like missile’s lateral jet flowfield at a rarefied high-altitude atmosphere using the in-house parallel direct si...
Hongji Zhuang +5 more
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