The Experts below are selected from a list of 306 Experts worldwide ranked by ideXlab platform
Fengmei Li - One of the best experts on this subject based on the ideXlab platform.
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external and internal Mass Transfer Effect on photocatalytic degradation
Catalysis Today, 2001Co-Authors: Dingwang Chen, Fengmei LiAbstract:Abstract A rational approach is proposed in determining the Effect of internal and external Mass Transfer, and catalyst layer thickness during photocatalytic degradation. The reaction occurs at the liquid–catalyst interface and therefore, when the catalyst is immobilized, both external and internal Mass Transfer plays significant roles in overall photocatalytic processes. Several model parameters, namely, external Mass Transfer coefficient, dynamic adsorption equilibrium constant, adsorption rate constant, internal Mass Transfer coefficient, and Effective diffusivity were determined either experimentally or by fitting realistic models to experimental results using benzoic acid as a model component. The Effect of the internal Mass Transfer on the photocatalytic degradation rate over different catalyst layer thickness under two different illuminating configurations was analyzed theoretically and later experimentally verified. It was observed that an optimal catalyst layer thickness exists for SC (substrate-to-catalyst) illumination.
H B Pattanayak - One of the best experts on this subject based on the ideXlab platform.
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Flow over Exponentially Stretching Sheet through Porous Medium with Heat Source/Sink
The Journal of Engineering, 2015Co-Authors: I. Swain, S R Mishra, H B PattanayakAbstract:An attempt has been made to study the heat and Mass Transfer Effect in a boundary layer MHD flow of an electrically conducting viscous fluid subject to transverse magnetic field on an exponentially stretching sheet through porous medium. The Effect of thermal radiation and heat source/sink has also been discussed in this paper. The governing nonlinear partial differential equations are transformed into a system of coupled nonlinear ordinary differential equations and then solved numerically using a fourth-order Runge-Kutta method with a shooting technique. Graphical results are displayed for nondimensional velocity, temperature, and concentration profiles while numerical values of the skin friction local Nusselt number and Sherwood number are presented in tabular form for various values of parameters controlling the flow system.
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numerical investigation on heat and Mass Transfer Effect of micropolar fluid over a stretching sheet through porous media
alexandria engineering journal, 2015Co-Authors: B Mohanty, S R Mishra, H B PattanayakAbstract:Abstract The present paper deals with the study of unsteady heat and Mass Transfer characteristics of a viscous incompressible electrically conducting micropolar fluid. The flow past over a stretching sheet through a porous medium in the presence of viscous dissipation. A uniform magnetic field is applied transversely to the direction of the flow. Similarity transformations are used to convert the governing time dependent non-linear boundary layer equations into a system of non-linear ordinary differential equations that are solved numerically by Runge–Kutta fourth order method with a shooting technique. The influence of unsteady parameter ( A ), Eckert number ( E c ), porous parameter ( K p ), Prandtl number ( P r ), Schmidt number ( S c ) on velocity, temperature and concentration profiles are shown graphically. The buoyancy force retards the fluid near the velocity boundary layer in case of opposing flow and is favorable for assisting flow. In case of assisting flow, the absence of porous matrix enhances the flow. The impact of physical parameters on skin friction co-efficient, wall couple stress and the local Nusselt number and Sherwood number are shown in tabular form.
Kexin Xu - One of the best experts on this subject based on the ideXlab platform.
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Optimization of surface plasmon resonance glucose detection based on D-galactose/D-glucose protein amine coupling method
Advances in Optoelectronics and Micro nano-optics, 2010Co-Authors: Peng Wu, Jingxin Zhang, Dachao Li, Kexin XuAbstract:Measuring the glucose concentration of interstitial fluid in human body is an Effectively way to control and treat diabetes. A surface plasmon resonance (SPR) system based on a miniature integrated SPR sensor is presented in this paper to measure the glucose concentration in interstitial fluid. D-galactose/D-glucose Binding Protein (GGBP) which can specifically absorb glucose is immobilized onto the SPR sensor surface by amine coupling method for higher sensitivity. The experiment result is affected by various factors, such as baseline, flow velocity, Mass Transfer Effect, temperature, bubbles. In this paper these factors are studied systemically by experiments and some solutions are proposed accordingly: (1) Dynamic baseline can provide the best baseline location during the measurement. (2) Flow velocity of 10uL/min-30uL/min is supposed to be chosen. (3) The density of protein immobilized on the sensor surface should maintain lower to avoid the Mass Transfer Effect. (4) Higher response is got when the temperature is between 26°C and 30°C and it is important to keep temperature constant during the experiment. (5) Samples should be degassed and filtered before the experiment and make sure there is no air in the pipeline. Through optimizing the experiment conditions, the sensitivity and stability of measurement are improved.
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Research on Influencing Factors of Surface Plasmon Resonance Glucose Detection Based on D-Galactose/D-Glucose Protein Immobilizied by Amine Coupling Method
Volume 2: Biomedical and Biotechnology Engineering, 2010Co-Authors: Peng Wu, Jingxin Zhang, Dachao Li, Bing Song, Kexin XuAbstract:Prediction of blood glucose based on measuring the glucose concentration in interstitial fluid is an Effectively way to control diabetes. A surface plasmon resonance (SPR) system based on a miniature integrated SPR sensor is set up in this paper to measure the glucose concentration in interstitial fluid, and the D-galactose/D-glucose Binding Protein (GGBP) which can specifically absorb glucose is immobilized onto the SPR sensor surface by amine coupling method for higher sensitivity. The experiment result is affected by various factors, such as the grime on sensor surface, baseline, flow velocity, Mass Transfer Effect, temperature, protein activity, bubbles. In this paper these factors are studied systemically by experiments and some solutions are proposed accordingly: (1) Make sure the sensor surface is clean before it is used. (2) Dynamic baseline can provide the best baseline location during the measurement. (3) Flow velocity of 10uL/min-30uL/min is supposed to be chosen. (4) The density of protein immobilized on the sensor surface should maintain lower to avoid the Mass Transfer Effect. (5) Higher response is got when the temperature is between 26°C and 30°C and it is important to keep temperature constant during the experiment. (6) The protein should be preserved with a proper way and make sure it is active during the measurement. (7) The sample should be degassed and filtered before the experiment and make sure there is no air in the pipeline. Through optimizing the experiment conditions, the sensitivity and stability of the measurement are improved.Copyright © 2010 by ASME
Si Wouk Kim - One of the best experts on this subject based on the ideXlab platform.
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Biodegradation of Methyl Orange by alginate-immobilized Aeromonas sp. in a packed bed reactor: external Mass Transfer modeling
Bioprocess and Biosystems Engineering, 2014Co-Authors: Mathur Nadarajan Kathiravan, Siluvai Antony Praveen, Geun Ho Gim, Gui Hawn Han, Si Wouk KimAbstract:Azo dyes are recalcitrant and xenobiotic nature makes these compounds a challenging task for continuous biodegradation up to satisfactorily levels in large-scale. In the present report, the biodegradation efficiency of alginate immobilized indigenous Aeromonas sp. MNK1 on Methyl Orange (MO) in a packed bed reactor was explored. The experimental results were used to determine the external Mass Transfer model. Complete MO degradation and COD removal were observed at 0.20 cm bead size and 120 ml/h flow rate at 300 mg/l of initial dye concentration. The degradation of MO decreased with increasing bead sizes and flow rates, which may be attributed to the decrease in surface of the beads and higher flux of MO, respectively. The experimental rate constants ( k _ps) for various beads sizes and flow rates were calculated and compared with theoretically obtained rate constants using external film diffusion models. From the experimental data, the external Mass Transfer Effect was correlated with a model J _D = K Re ^−(1 − n ). The model was tested with K value (5.7) and the Colburn factor correlation model for 0.20, 0.40 and 0.60 bead sizes were J _D = 5.7 Re ^−0.15, J _D = 5.7 Re ^−0.36 and J _D = 5.7 Re ^−0.48, respectively. Based on the results, the Colburn factor correlation models were found to predict the experimental data accurately. The proposed model was constructive to design and direct industrial applications in packed bed reactors within acceptable limits.
Dingwang Chen - One of the best experts on this subject based on the ideXlab platform.
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external and internal Mass Transfer Effect on photocatalytic degradation
Catalysis Today, 2001Co-Authors: Dingwang Chen, Fengmei LiAbstract:Abstract A rational approach is proposed in determining the Effect of internal and external Mass Transfer, and catalyst layer thickness during photocatalytic degradation. The reaction occurs at the liquid–catalyst interface and therefore, when the catalyst is immobilized, both external and internal Mass Transfer plays significant roles in overall photocatalytic processes. Several model parameters, namely, external Mass Transfer coefficient, dynamic adsorption equilibrium constant, adsorption rate constant, internal Mass Transfer coefficient, and Effective diffusivity were determined either experimentally or by fitting realistic models to experimental results using benzoic acid as a model component. The Effect of the internal Mass Transfer on the photocatalytic degradation rate over different catalyst layer thickness under two different illuminating configurations was analyzed theoretically and later experimentally verified. It was observed that an optimal catalyst layer thickness exists for SC (substrate-to-catalyst) illumination.