... 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...
... 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 ... convection heatandmasstransfer all the more challenging Perhaps the two biggest challenges for an instructor of a graduate-level course in convection are defining a scope for the course and striking...
... 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 ... involving fluid flow), the in ow and outflow terms also include energy (thermal and mechanical) that is advected (carried) by mass entering and leaving the control volume For instance, if the mass ... 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...
... 2.10 2.13 Find the difference in pressure between tanks A and B, if d1 ¼ ft, d2 ¼ in. , d3 ¼ 2.4 in. , and d4 ¼ in Find the pressure at point A Air B b d4 45° H2O in A in Water temp = 150°F in Kerosene ... Engineering Department at Oregon State University with expertise in biochemical engineering He has had a significant in uence on this edition’s sections on mass transfer, both in the text andin ... Chapter Introduction to Momentum Transfer Of specific interest in momentum transfer is the description of the point-to-point variation in the pressure Denoting the directions east and north in Figure...
... 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...
... 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 ... 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 ... only what is happening at points in time, not points in space We may use information about space effects (initial and boundary conditions) in evaluating terms (integrals) in the model, but we...
... 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 ... of topics inheatandmasstransfer processes for a variety of industrial applications The research papers provide information and guidelines in terms of theory, mathematical modeling and experimental...
... 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 ... 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 ... first determined by solving the massand momentum balance equations The heatandmass balance equations are then solved by a finite volume method after subdividing the fin in several sub-fin regions...
... 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 ... 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 ... HeatandMassTransfer Modeling and Simulation Fig 12 Velocity boundary layer for CuO / water nanofluid Fig 13 Velocity boundary layer for Alumina / water nanofluid HeatandMassTransferin External...
... 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 ... reached The factors that influence the drying process in the first period of drying are the conditions of external heatandmass exchange in the system: drying product and surrounding air movement For ... occurrence of shrinkage during drying The course and time of drying process depend on drying conditions, on temperature and moisture profiles developed during the drying process, and above all,...
... constant drying rate takes place Verified models of the first drying period Eqs (9) and (11) taking into account drying shrinkage confirm that the decrease of the drying rate during the first drying ... 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∞): ... Number of terms in infinite series Fig Moisture diffusion coefficient vs number of terms in infinite series in Eq (31) and RMSE vs number of terms in infinite series in Eq (31) (first drying period...