A theoretical analysis to the problem of free convection flow induced by an infinite moving vertical plate subject to a ramped surface temperature with simultaneous mass transfer to or from the surface is presented. T...
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(纸本)9780791843574
A theoretical analysis to the problem of free convection flow induced by an infinite moving vertical plate subject to a ramped surface temperature with simultaneous mass transfer to or from the surface is presented. The plate temperature increases linearly over a specified period of time until it reaches a constant value. Diffusional mass transfer occurs at the surface contributing to the density gradient in the boundary layer. An exact analytical solution to the governing equations for flow, temperature and concentration with coupled boundary conditions in the dimensionless form have been developed using the Laplace transform technique. Heat and mass transfer at the plate are assumed to be purely diffusive in nature. The cases of impulsive start and uniformly accelerating start of the plate are considered and solutions for the flow, temperature and concentration fields are derived. The effects of different system parameters have been studied in terms of relevant dimensionless groups such as Grashof number (Gr ), Prandtl number (Pr), Schmidt number (Sc), time (t) and the mass to thermal buoyancy ratio (N). The possible cases of the last parameter, namely N = O (the buoyancy force is due to thermal diffusion only), N > 0 (the mass buoyancy force acts in the same direction of thermal buoyancy force) and N
Faults in Heating Ventilating and Air-Conditioning (HVAC) systems can play a significant role against the system in terms of energy efficiency loss, performance degradations, and even environmental implications. Being...
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The Puppet King website includes a large number of digital video and audio materials of Taiwan's traditional puppet shows. These digital materials include pictures, videos, music and a digital right management sys...
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Based on reasonable hypothesis, two general expressions and their six derived formulae for estimating the critical temperature (T_b) of thermal explosion for energetic materials (EM) were derived from the Semenov'...
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Based on reasonable hypothesis, two general expressions and their six derived formulae for estimating the critical temperature (T_b) of thermal explosion for energetic materials (EM) were derived from the Semenov's thermal explosion theory and eight non-isothermal kinetic equations. We can easily obtain the values of the initial temperature (T_(0i)) at which DSC curve deviates from the baseline of the non-isothermal DSC curve of EM, the onset temperature (T_(ei)), the exothermic decomposition reaction kinetic parameters and the values of T_(00) and T_(e0) from the equation T_(0i or ei)=T_(00 or e0)+α_1β_i+α_2β_i~2+…+α_(L-2)β_i~(L-2), i=1,2,…,L and then calculate the values of T_b by the six derived formulae. The T_b values for seven nitrosubstituted azetidines, 3,3-dinitroazetidinium nitrate (1), 3,3-dinitroazetidinium picrate (2), 3,3-dinitroazetidinium-3-nitro-1,2,4-triazol-5-onate (3), 1,3-bis(3',3'-dinitro-azetidine group)-2,2-dinitropropane (4), 1-(2',2',2'-trinitroethyi)-3,3-dinitroazetidine (5), 3,3-dinitroazetidinium perchiorate (6) and 1-(3',Y-dinitroazetidineyl)-2,2-dinitropropane (7), obtained with the six derived formulae are agreeable to each other, whose differences are within 1.5%. The results indicate that the heat-resistance stability of the seven nitrosubstituted azetidines decreases in the order 6＞7＞5＞4＞3＞2＞1.
The authors describe a high-throughput patterning process used to create arrays of molecular-scale features for the study of cytoskeletal protein binding interactions. The process uses a shadow-evaporated metal mask t...
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An emerging literature focuses on differences in learning style between the so-called millennial generation and preceding generations of students. Concurrently, engineering educators have developed a number of intuiti...
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The formation and dynamics of spatially extended compositional domains in multicomponent lipid membranes both in vivo and in vitro lie at the heart of many important biological and biophysical phenomena. While the the...
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The formation and dynamics of spatially extended compositional domains in multicomponent lipid membranes both in vivo and in vitro lie at the heart of many important biological and biophysical phenomena. While the thermodynamic basis for domain formation has been explored extensively in the past, the roles of membrane and exterior fluid hydrodynamics on domain formation kinetics have received less attention. A case in point is the impact of hydrodynamics on the dynamics of compositional heterogeneities in lipid membranes in the vicinity of a critical point. In this Rapid Communication it is argued that the asymptotic dynamic behavior of a lipid membrane system in the vicinity of a critical point is strongly influenced by hydrodynamic interactions. More specifically, a mode-coupling argument is developed which predicts a scaling behavior of lipid transport coefficients near the critical point for both symmetric and asymmetric bilayers immersed in a bulk fluid.
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