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Diffusion Limitations in Biocatalytic Reactions
Published in M. Jerold, V. Sivasubramanian, Biochemical and Environmental Bioprocessing, 2019
Carlin Geor Malar, Muthulingam Seenuvasan, Kannaiyan Sathish Kumar
Autocatalysis is a catalytic reaction that is easily catalyzed by the products of the same reaction. The rate of catalysis depends on the rate of product formation and thereby increases with the progress of the reaction.
Chemical Reaction Thermodynamics, Kinetics, and Reactor Analysis
Published in Debabrata Das, Debayan Das, Biochemical Engineering, 2019
Next we will consider the example of an autocataytic reaction. In an autocatalytic reaction, the product of the reaction acts as the catalyst. () A+R→R+R
Optimization Aspects in Chemical Reaction Engineering
Published in Salmi Tapio, Mikkola Jyri-Pekka, Wärnå Johan, Chemical Reaction Engineering and Reactor Technology, 2019
Salmi Tapio, Mikkola Jyri-Pekka, Wärnå Johan
Autocatalysis implies that the reaction rate increases as the reaction progresses. Typically the rate is retarded again at high conversions of the reactants. The kinetic curve recorded in a batch reactor has thus an S-shaped form as described by Figure 10.6. The reaction rate is accelerated in the beginning, because the product molecules contribute to the forward rate. At high conversions of the reactant, the reaction rate declines because the reactant concentration is low.
Radiation absorption on MHD free conduction flow through porous medium over an unbounded vertical plate with heat source
Published in International Journal of Ambient Energy, 2023
Kodi Raghunath, Mopuri Obulesu, Konduru Venkateswara Raju
The study of heat and mass transfer with chemical reaction is of great practical importance to engineers and scientists because of its almost universal occurrence in many branches of science and engineering. Possible applications of this type of flow can be found in many industries like power industry and chemical process industries. Recently, Obulesu, Raghunath, and Sivaprasad (2020) have discussed Hall current effects on MHD convective flow past a porous plate with thermal radiation, chemical reaction with radiation absorption. Prasad et al. (2019) have studied the MHD flow of a visco-elastic fluid over an unbounded rotating porous plate with heat source and chemical reaction. Sudheerbabu and Satyanarayana (2009) have discussed effects of the chemical reaction and radiation absorption on free convection flow through porous medium with variable suction in the presence of the uniform magnetic field. Raju, Varma, and Rao (2013) have analysed unsteady MHD-free convection and chemically reaction flow past an infinite vertical porous plate. Irfan et al. (2022) have reviewed significance of non-Fourier heat flux on ferromagnetic Powell-Eyring fluid subject to cubic autocatalysis kind of chemical reaction. Khan et al. (2021c) have studied the importance of heat generation in chemically reactive flow subjected to convectively heated surface. Ijaz Khan et al. (2017) have studied chemically reactive flow of upper-convected Maxwell fluid with Cattaneo–Christov heat flux model.
Influence of chemical reaction on MHD couple stress nanoliquid flow over a bidirectional stretched sheet
Published in International Journal of Ambient Energy, 2022
P. V. Satya Narayana, Nainaru Tarakaramu, D. Harish Babu
In industrial chemical processes, different chemical reactions are performed in a reactor to convert cheaper raw materials into higher standard products. It is observed that the homogeneous (reaction between two gases or between two liquids) and heterogeneous (reaction between a liquid and a gas) chemical reactions (Sudarsana Reddy and Sreedevi 2020a, 2020b; Sudarsana Reddy, Sreedevi, and Chamkha 2020; Harish Babu et al. 2018; Santhi et al. 2020; Satya Narayana 2017; Basir et al. 2020) are very important in many engineering and industrial applications such as the design of chemical processing equipment, and food processing etc. Heat and mass transfer of a nanofluid with motile gyrotactic microorganism and chemical reaction in the presence of slip and convective boundary conditions was presented by Ramzan, Chung, and Ullah (2017). It is observed from their study that, the motile density of microorganisms decrease slowly for enlarging values of bio-convection Lewis number and Péclet number. Recently, some of the investigators (Hayat et al. 2017a, 2017b) examined the chemical reaction effect in a nanofluid flow over a nonlinear stretching surface. The quartic autocatalysis kind of homogenous-heterogeneous chemical reaction has been developed by Makinde and Animasaun (2016). It is observed that the skin-friction coefficient is larger for higher values of thickness parameter and rate of heat transfer is smaller for larger values of temperature parameter.
Significance of Darcy-Brinkman porous drag forces and Cattaneo-Christov thermal transportation on the features of second-grade fluid flows conveying copper nanomaterials past an unsteady stretching permeable sheet heated convectively
Published in Waves in Random and Complex Media, 2022
In recent years, the fluid motions over different geometrical surfaces were analyzed comprehensively by several researchers to gain a better theoretical understanding of the dynamics of such flows. Geometrically, the spheres [1,2], the cones [3,4], the cylinders [5,6], and the flat sheets [7,8] are among the most commonly employed surfaces in the related literature survey. In this context, Davis and Werle [9] examined thoroughly the characteristics of laminar fluid flows near the paraboloid surfaces of revolution, which provide more realistic flow patterns as compared with the flow over other surfaces. Recently, Animasaun and Sandeep [10] analyzed the motion of alumina (36 nm)-water nanofluid over an upper horizontal surface of a paraboloid of revolution (UHSPR) under the influences of buoyancy-driven forces and variable thermophysical properties. Makinde and Animasaun [11], supposed the same UHSPR geometrical configuration to inspect the significance of quartic autocatalysis chemical reaction and nonlinear thermal radiation on MHD bioconvective nanofluid flows.