heat amp mass transfer in duct flow

... electronic cooling, ceramic processing, and overland flow during rainfall In thermal insulation engineering, an appreciable insulating effect is derived by placing porous material in the gap between ... cases in heat and mass transfer: a) unsteady external flows past a porous square or trapezoidal cylinder, b) natural convective heat-transfer in a porous wavy cavity, c) forced convective heat-transfer ... Trang 28 Chapter 1 Introduction Chapter 1 Introduction There have been wide applications for natural and manufactured porous materials in engineering processes, including heat sinks, mechanical...

Ngày tải lên: 12/09/2015, 21:13

... Available online Keywords: Biomass Gasification Fixed bed downdraft gasifier Modeling Kinetics Heat and mass transfer a b s t r a c t A two dimensional modeling is developed in the reduction zone ... initial size at the reactor inlet (shrinking caused by theflaming-pyrolysis step)[13] - Conversion of bio-char particles in the reduction zone is ach-ieved following the shrinking unreacted core model ... reactions and internal and external mass and heat transfer processes Indeed, interaction between the chemical and transport mechanisms dur-ing gasification is of fundamental importance in the description...

Ngày tải lên: 01/08/2016, 09:31

... encompass fluid flow,heat and mass transfer over disks rotating in a resting, rotating or radially accelerat-ing fluid; unsteady conjugate heat transfer of a rotating disk (Fig 1.1a); disk cooling by ... mass forces can cause active influence on fluid flow (disturbing theflow, causing secondary flows and increasing turbulence level in turbulent flowregime) or conservative influence (stabilizing ... fields emerging in flow of an electrically conducting fluid in a magnetic field are not considered in thismonograph In rotating systems, inertial forces are external with respect to fluid flow, and...

Ngày tải lên: 14/05/2018, 13:50

... eStudio Calamar, Berlin/Figueres Printed on acid-free paper Springer is part of Springer Science+Business Media (www.springer.com) Trang 6Treatment of Rising Damp in Historical Buildings 1Ana Sofia ... yielded interesting results Numerical simulation studies, using thesoftware WUFI-2D, have given similar findings This paper describes a new system for treating rising damp in historic buildingsbased ... yielded interesting results Numerical simulation studies, using theprogramme WUFI-2D, have given similar findings This paper describes a new system for treating rising damp in historic buildingsbased...

Ngày tải lên: 31/03/2014, 16:20

... nanoparticles, heat transfer is an increasing function of Br and a de-creasing function of thermal radiative heat flux with injection as given in Figs 8 and 9 Heat transfer escalates with increase in nanoparticles ... the injection case Heat transfer profiles significantly increase across the whole domain of the disks for suction and injection cases as shown in Figs 4 and 5 Injection increases the mass transfer ... seen for mass transfer rate Figures 2, 3, 4, 5, 6, and 7 depict the behavior of Re on velocity, heat, and mass transfer profiles In the case of suction, increasing behavior is observed in the center...

Ngày tải lên: 04/12/2022, 10:34

... estimation; 5 Internals design This chapter deals with column packing efficiency, considering the main studies including random and structured packing columns In packed columns, mass transfer efficiency ... between the mass transfer coefficient and a packing efficiency definition, are not easily obtained, in a general manner This is due to the divergence between the mechanisms of mass transfer in a packed ... rings C fL represents the approximation coefficient of the flooding point for the liquid phase mass transfer The values of φ and Ψ are packing parameters for the liquid and vapor phase mass transfer,...

Ngày tải lên: 18/06/2014, 22:20

... governed by convective heat and mass transfer This initial stage of drying is known as the constant or unhindered drying period (CDP) As drying proceeds, internal moisture within the particle diffuses ... satisfying single phase flow will not be sufficient for flows where inter-particle interactions are present These interactions can be in the form of collision between adjacent particles as in the ... Drying model equations – heat and mass transfer The conservation equation of energy (q = g, s) is given by: By introducing the number density of the dispersed phase (solid in this case), the intensity...

Ngày tải lên: 19/06/2014, 08:20

... 132 Mass Transfer in Chemical Engineering Processes Ying-Yue, W.; Chi-Tzong, H.; Wen-Ta, C & Jia-You, F (2001) In vitro and in vivo evaluations of topically applied capsaicin and ... capsaicin Therefore, the optimum combined condition in methanol is confirmed to be at 57C for 2 56 min The instability of capsanthin at increased temperature is again confirmed by optimum combined ... et al, 2011) 137 138     Mass Transfer in Chemical Engineering Processes Amines: Monoethanolamine (MEA), Diethanolamine (DEA) and Methildiethanolamine (MDEA) are organic chemical...

Ngày tải lên: 19/06/2014, 08:20

... Zp usually reveal an initial sharp increase in cell disintegration with increasing in energy input, after which any further increase causes only marginal effects, being a saturation level ... permeabilization of plant tissue was obtained... in biotechnology and medicine to deliver drugs and genes into living cells 152 Mass Transfer in Chemical Engineering Processes (Neumann et al., ... regarding minimizing cell damage, monitoring the improvement of mass transfer, or for the evaluation of various biochemical synthesis reactions in living systems... parameters affecting the...

Ngày tải lên: 19/06/2014, 08:20

... located in the skin, that are only partially extracted during traditional winemaking process, due to the resistances to mass transfer of cell walls and cytoplasmatic membranes In red wine, the main ... is likely to support many different mass transfer-based processes in the food industry, directed to enhancing process intensification In particular, the induction of membrane permeabilization ... on mass transfer rates during drying processes The reported effect of PEF treatment on mass transfer rates during drying of vegetable tissue is typically an increase in the effective diffusion...

Ngày tải lên: 19/06/2014, 08:20

... remained in trisodium phosphate and stripping solutions (mg/l) Remained in TSP Remained in stripping solution Fig. 15. Amount of uranium ions remained in trisodium phosphate and stripping ... (cm3/mgmin) Feed- or aqueous-phase mass transfer coefficient or mass transfer ki coefficient in feed phase km Organic-phase mass transfer coefficient or mass transfer coefficient in ... conservation of mass for copper ion transport in the hollow fiber is considered as shown in Fig. 18. Fig. 18. Transport of copper ions in the hollow fiber Mass Transfer in Chemical Engineering Processes...

Ngày tải lên: 19/06/2014, 08:20

... mechanical engineering series) in order to cover the specialized topics in heat transfer, such as radiation, boiling, and condensation Further topics in mass transfer can be taught in an additional ... topics: heat transfer, mass transfer, and momentum transfer (fluid flow) In many of the unit operations (such as distillation), all three transport phenomena (i.e., fluid flow, heat transfer, and mass ... driving force for fluid flow is a pressure difference For example, when the valve in a drinking fountain is opened, the water flows out in a jet because the water pressure inside the fountain...

Ngày tải lên: 02/04/2014, 16:46

... 36 2.5 Pull-over Induced Lateral Buckling 45 2.6 Hooking 46 2.7 Existing Guidelines 47 v 2.7.1 Guidelines for Trenching Design of Submarine Pipelines (Trevor Jee Associates, ... Displacement of the pipe in the pull-over response xxv Bending strain Critical bending strain Pipeline usage factor , empirical factor in Ellinas and Walker’s formula Longitudinal compressive stress ... pull-over Central deflection at the point of impact xxvi CHAPTER 1 Introduction 1.1 Background In the very beginning, pipelines in the North Sea were all trenched Trenching is a very expensive way to...

Ngày tải lên: 09/09/2015, 11:25

... close in angle Generalizing this line of reasoning, it follows that clustering in time is likely associated with some kind of clustering in angle The nature of the angular clustering of indoor ... principle of beamforming is that by adding the received signal from several antennas with appropriate amplitude scaling and phase shifting, gains in signal power and reduction in noise and interference ... antennas can be combined in various ways, including diversity combining, phased array processing, and adaptive array algorithms Adaptive array sytems are becoming increasingly feasible for high...

Ngày tải lên: 20/11/2012, 11:32

... Measurement of protein using bicinchoninic acid, Anal Biochem., 150, 76-85 Sparling, R., Risbey, D and Poggi-Varaldo, H M., 1997 Hydrogen production from inhibited anaerobic composters, Int J Hydrogen ... hydrogen production; fundamentals and limiting processes, Int J Hydrogen Energy, 27, 1185-1193 Han, S.-K and Shin, H.-S., 2002 Enhanced acidogenic fermentation of food waste in a continuous -flow reactor, ... sealed using open-top screw caps with rubber septum The bottles were then placed in a reciprocating shaker at 35oC and 100 rpm The biogas production was determined using a glass syringe of 20-200...

Ngày tải lên: 05/09/2013, 08:40

... H2-producing sludge might also be a significant factor affecting the fermentative H2 production However, little information concerning the surface characteristics of H2-producing sludge in acidogenic ... Image of the anaerobic H2-producing sludge Experiment Fermentative H2 production experiments were conducted in a 5-L fermentor (Baoxin Biotech Ltd., China) An 1000-mL heat- treated seed sludge of ... rice winery wastewater in an upflow anaerobic reactor by using mixed anaerobic cultures Inter J Hydrogen Energy Vol.27, 1359-1365 Zheng, X J., Yu, H.Q (2004) The roles of pH in biologic production...

Ngày tải lên: 05/09/2013, 09:08

... highly inhomogeneous Consequently, operating fuel cells are very often close to critical operating conditions, such as flooding and drying, at least locally [12] An operating fuel cell has varying ... thermal and swelling induced strains, respectively ISSN 2076-2895 (Print), ISSN 2076-2909 (Online) ©2010 International Energy & Environment Foundation All rights reserved 930 International Journal ... This model takes into account convection and diffusion of different species in the channels as well as in the porous gas diffusion layer, heat transfer in the solids as well as in the gases, and...

Ngày tải lên: 05/09/2013, 14:58

... A Gopinath has completed master of engineering in internal combustion engineering with gold medal from College of Engineering, Guindy, Anna University Chennai, Chennai, Tamilnadu, India in 2008 ... fuels in a fully instrumented, single cylinder, direct injection diesel engine A series of tests were conducted using different biodiesel fuel, with the engine working at 1500 r.p.m The following ... advance in injection timing due to fuel compressibility could lead to a longer premixed burning phase and an increase in the production of NOX [15] The advance in injection timming was further investigated...

Ngày tải lên: 05/09/2013, 15:28