... Jean-Michel Hugo and Frédéric Topin HeatandMassTransferin Matrices of Hygroscopic Wheels C R Ruivo, J J Costa and A R Figueiredo 187 219 245 Treatment of Rising Damp in Historical Buildings Ana ... dampening of the RH variation in a room and its hygroscopicity level, which is mainly dependant on the surface finishing materials and furnishing According to the principle, a hygroscopic inertia index ... epoxy paint and the four edges were covered with aluminium tape, allowing vapour transfer only in the main face The Evaluation of Hygroscopic Inertia 31 Fig Mass variation stable cycle in MBV...
... Chapter Introduction to MomentumTransfer Of specific interest inmomentumtransfer is the description of the point-to-point variation in the pressure Denoting the directions east and north in Figure ... Nonetheless, the subjects of momentumtransfer (fluid mechanics), heat transfer, andmasstransfer remain, at least in part, important components of all engineering curricula It is in this context that ... Fundamentals of Momentum, Heat, andMassTransfer 5th Edition Fundamentals of Momentum, Heat, andMassTransfer 5th Edition James R Welty Department of Mechanical Engineering Charles E Wicks...
... mechanical, including photocopying, microfilming, and recording, or by any information storage and retrieval system, without permission in writing from the publisher Current printing (last digit): PRINTED ... only what is happening at points in time, not points in space We may use information about space effects (initial andboundary conditions) in evaluating terms (integrals) in the model, but we ... unsteady-stute conductive heut trunsfe r Infinite cylinder and sphere Figure 7.2.8-4 Unsteady-state heattransferin an infinite cylinder with uniform initial temperature and constant surface temperatwe...
... 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 ... Ochoa-Tapia and Whitaker’s stress jump conditions for the flow, heatandmasstransferin porous/fluid coupled domains, and to investigate their effects on local and global heatandmass transfer; ... number in x and y directions in inlet int interface line in reactor interface interface value l east, west, north, and south point of control volume n north w west p control volume center point;...
... kinetic models must include detailed transport phenomena since char gasification is a process controlled by both chemical reactions and internal and external massandheattransfer processes Indeed, ... adopted and the ability of the developed model in predicting the thermo-chemistry of char gasification and the heatandmasstransfer phenomena within the downdraft reactor Simulations In this ... of the initial size at the reactor inlet (shrinking caused by the flaming-pyrolysis step) [13] - Conversion of bio-char particles in the reduction zone is achieved following the shrinking unreacted...
... Thermal andMass Diffusion Effects 10.15.1 Conservation Equations and Scaling Analysis 10.15.2 HeatandMassTransfer Analogy 10.16 Solutions for Natural Convection Caused by Combined Thermal andMass ... Notation w X Y y Velocity in z direction in Cartesian coordinates, in θ direction in cylindrical coordinates, or in ϕ direction in spherical coordinates (m/s); work per unit mass (W/kg) Mole fraction ... computing power and information Like most other science and technology fields, convective heatandmasstransfer is already too vast to be covered in a semester-level course even at an outline level...
... convection and the superposition of free and forced convection Finally an introduction to heattransferin compressible fluids is presented In the fourth chapter the heatandmasstransferin condensation ... chapter, which contains the basic concepts and fundamental laws of heatandmasstransfer The student obtains an overview of the different modes of heatandmass transfer, and learns at an early ... solved using the balance equations and the heatandmasstransfer coefficients, without requiring too deep a knowledge of the theory of heatandmasstransfer Such problems are dealt with in the...
... practice, and whether the discipline of heattransfer would remain relevant After weighing various arguments, we concluded that the future of engineering was bright and that heattransfer would remain ... Coefficients 6.2.1 HeatTransfer 382 6.2.2 MassTransfer 383 6.2.3 The Problem of Convection 385 Laminar and Turbulent Flow 6.3.1 Laminar and Turbulent Velocity BoundaryLayers 389 6.3.2 Laminar and Turbulent ... recommendations Chapter Introduction sets the stage for any course inheattransfer It explains the linkage between heattransferand thermodynamics, and it reveals the relevance and richness of the...
... thickness and thermal conductivity of a single pane window and the air space of a double pane window Representative winter surface temperatures of single pane and air space FIND: Heat loss through single ... thickness and thermal conductivity of a single pane window and the air space of a double pane window Representative winter surface temperatures of single pane and air space FIND: Heat loss through single ... KNOWN: Speed, width, thickness and initial and final temperatures of 304 stainless steel in an annealing process Dimensions of annealing oven and temperature, emissivity and convection coefficient...
... involvement of mass flow and mixing This is the mode of heattransfer through solid barriers and is encountered extensively inheattransfer equipment design as well as in heating and cooling of various ... adding the insulation, the surface temperature is reduced to 160°C and again the heat loss is mainly due to radiation, the surroundings in both cases being at 25°C Determine the change inheattransfer ... HEATANDMASSTRANSFER A sphere of 0.5m diameter containing hot fluid has an insulation of 0.1m thickness Before adding the insulation, the surface temperature was 260°C andheat loss was mainly...
... on the internal and external active surface The HeatandMassTransfer – Modeling and Simulation modeling routines were implemented in Fortran 90 and the equations solved numerically applying the ... Rodrigo and José J Linares Chapter Numerical Analysis of HeatandMassTransferin a Fin -and- Tube Air Heat Exchanger under Full and Partial Dehumidification Conditions Riad Benelmir and Junhua ... Process Intensification of Steam Reforming for Hydrogen Production Feng Wang, Guoqiang Wang and Jing Zhou 41 67 HeatandMassTransferin External Boundary Layer Flows Using Nanofluids Catalin Popa,...
... Therefore, the MPL 30 HeatandMassTransfer – Modeling and Simulation does not only have influence in terms of masstransfer limitations, but in kinetic and ohmic ones due to an excess of insulator material ... Ion Exchange Resin: Experimental Parameters and Modeling”, D.Sc Thesis, Universidade Estadual de Campinas, São Paulo, Brazil (In Portuguese) 16 HeatandMassTransfer – Modeling and Simulation ... simulation results 14 HeatandMassTransfer – Modeling and Simulation showed that either the maximum capacity of the adsorbent and the kinetic constant of adsorption and desorption influenced significantly...
... 2h Condensate mass flux Condensate-film Fig Heatandmasstransfer phenomenon around a fin-tube As the fins spacing is very weak regarding the fins height and length, heatandmasstransfer along ... first determined by solving the massandmomentum balance equations The heatandmass balance equations are then solved by a finite volume method after subdividing the fin in several sub-fin regions ... 44 HeatandMassTransfer – Modeling and Simulation 2l 2l Pl 2h 2h Pt air Pl Pt tube fin Fig Schematic of fins arranged around tubes lined up or ranked in staggered rows The investigation of heat...
... zero when going up the inlet and outlet or the upper and lower fin edges, and is also minimal near the tube surface 2.4.2 Solving heatandmasstransfer equations The heatandmasstransfer problem ... the other hand, the influence of ui on the heattransfer is such as the total heat rate increase with increasing the flow regime In the case of an ideal fin, the heattransfer increasing is quicker ... was determined, the water vapor, air stream and fin heatandmass balance equations were solved simultaneously It Numerical Analysis of HeatandMassTransferin a Fin -and- Tube Air Heat Exchanger...
... straight tube In this study, nitrogen was used as a driving gas and carrying gas with an inlet pressure of 1.4 and 1.6 MPa for the heating gas and powder carrying gas separately Heating gas temperature ... coating Probable 76 HeatandMassTransfer – Modeling and Simulation Fig Morphology of the cold sprayed coatings before and after steam reforming Process Intensification of Steam Reforming for ... strong heat effect And it will be more useful in large scale catalyst reactors due to the increasing heatandmass resistance in the catalytic bed Process intensification of steam reforming by...
... describing the natural and forced convective heatandmasstransfer regimes for nanofluids flowing in semi-infinite geometries, i.e external boundary layer flows along 96 HeatandMassTransfer ... 108 HeatandMassTransfer Modeling and Simulation Fig 12 Velocity boundary layer for CuO / water nanofluid Fig 13 Velocity boundary layer for Alumina / water nanofluid HeatandMassTransferin ... to a degradation in the heat Fig 10 Heattransfer coefficient at wall for CuO / water nanofluid HeatandMassTransferin External Boundary Layer Flows Using Nanofluids 107 transfer enhancement...
... Buoyancy-driven heattransfer enhancement in a two-dimensional enclosure using nanofluids Int J HeatMass Transf Vol 46 pp.3639-3653 Heat andMassTransferin External Boundary Layer Flows Using Nanofluids ... traducing both heatandmasstransferin forced convection It clearly appears that the thermal flow rate is strongly dependent 113 HeatandMassTransferin External Boundary Layer Flows Using ... in the masstransfer It is shown that using nanofluids strongly influences the boundary layer thickness by modifying the viscosity of the resulting mixture leading to variations in the mass transfer...
... 146 HeatandMassTransfer – Modeling and Simulation The parameter k, which occurs in the models of the first drying period, determines the initial drying rate 2.2 The second period of drying ... at the initial andboundary conditions given by Eqs (20) and (23), (ii) Eq (18) at the initial andboundary conditions given by Eqs (21) and (24)(27), and (iii) Eq (19) at the initial andboundary ... It is highly 144 HeatandMassTransfer – Modeling and Simulation dependent on the completeness of the mathematical model and the relationships used to describe heatandmasstransfer phenomena...
... 152 HeatandMassTransfer – Modeling and Simulation i the external masstransfer resistance is negligible, but the internal masstransfer resistance is large (Bi∞), ii the first term of infinite ... 0.95 10 Number of terms in infinite series Fig RMSE vs number of terms in infinite series in Eq (31) and R2 vs number of terms in infinite series in Eq (31) (first drying period – Eq (11), Bi∞): ... solid heating obtains the following form (Górnicki & Kaleta, 2007b): c M 1 dT hA dM T Ta L dt ρs Vs dt (61) 154 HeatandMassTransfer – Modeling and Simulation The specific heat...