This book provides a comprehensive analysis of heat and mass transfer effects on magnetohydrodynamic convective flows. Basic idea are stressed and discussed in detailed full developments of results are provided. It helps researchers, students and engineers and scientists who work in the area of heat transfer heat transfer on magnetohydrodynamic convective flows. Applications of the problem are also discussed.
FLOW PROBLEMS WITH HEAT AND MASS TRANSFER. In this Dissertation, investigations are carried out on Natural convection flow of fluid between two infinite vertical parallel plates for different physical situations as well as different fluid properties. The different thermal conditions considered in this dissertation include symmetric and asymmetric heating of the boundaries, periodic temperature variation on the boundaries, viscous dissipation heating as well as the role of Non- Fourier energy equation on convective heat transfer. The dissertation also investigated the influence of heat generation or absorption and mass leakage (suction/injection) through the channel boundaries. Closed form solutions are obtained for momentum, energy and concentration equations for different physical situations. It is hoped that the result presented in this dissertation will be of use in validating Computer routines for numerical solutions of more complex natural convection fluid flows in the presence of heat and mass transfer and in stimulating needed experimental work in this area.
This book is intended for engineering graduate students and research and development scientists who are interested in mass (and heat) transfer in pipe bends under single and two phase flow. The emphasis is on the mass transfer, which is the rate limiting process in Flow Accelerated Corrosion. In particular, the effect of the flow dynamics under single phase flow and the phase interaction and redistribution under annular air-water two phase flow on the local mass transfer distribution is presented. The mass transfer distributions and regions of high mass transfer in different bend geometries are correlated to areas of failure under flow accelerated corrosion observed in the nuclear industry. The book presents a novel technique to obtain detailed mass transfer measurements in intricate geometries with evolving surface roughness.
This book presents a new technique to enhance heat transfer coefficient of double pipe heat exchanger. Heat transfer enhancement is the practice of modifying a heat transfer surface to increase the heat transfer coefficient between the surface and fluid. An experimental investigation has been conducted to evaluate the heat transfer performance of double pipe heat exchanger. Experiments were carried out under two condition of full-length and half-length twisted tape inserts in double pipe heat exchanger and result are compared with the smooth double pipe heat exchanger. By inserting twisted tape inside the tube, they act as turbulence promoter. It mixes the boundary fluid with bulk fluid and boundary layer thickness is reduced by imparting a rotational motion to a fluid flowing inside the tube of double pipe heat exchanger.The effect of the full-length and half-length twisted tape on the heat transfer coefficient and pressure drop is experimentally investigated in case of different mass flow rate. The performance evaluation of the smooth tube, and tube with full length and half-length tapes were carried out on the basis of equal mass flow rates and unit pressure drop.
Heat transfer is an important subject for Engineers. Composite structures have considerable practical utility which are made of two or more layers of different materials. Composite structures also uses for wall construction of combustion chamber of a boiler, for gas turbine blades, for walls of I.C. Engines combustion chambers etc. This book covered basics of heat transfer, laws of heat transfer, applications of heat transfer and significance of heat transfer. Developed governing equations for heat conduction. Described methodology for design and fabrication of composite plane wall.Determined heat transfer analysis parameters of composite plane wall such as temperature distribution across the width of wall, thermal resistance, air gap resistance, conductance, heat conducted, heat transfer coefficients and over all heat transfer coefficients and also studied on respective parameters. Finite element methods and computational fluid dynamics discussed on heat transfer phenomenon. Performance characteristics of composite plane wall studied. This book is most useful to students in the area of Mechanical Engineering of B.Tech, M.Tech and Ph.D.Scholars.
The author studied the “Mass Transfer and Natural Convection Effects in steady MHD flow with Radiation and Thermal Conductivity over a Porous Flat Plate”. The different phase of overall numerical solution procedure from their non-dimensional form through group transformation to the solution of flow equations and then Runge-Kutta with shooting technique has been applied to solve the problem. The results showing the effects of various physical parameters on velocity temperature and concentration profiles have been obtained and presented graphically. It was concluded that convective heat transfer parameter lowers the velocity and temperature however, the concentration is increased. Similarly, radiation parameter increases the velocity, temperature and the rate of heat transfer but concentration decreases. The Prandtl number reduces velocity and temperature. The study may be helpful in research of many engineering branches as well as in applied scientific fields.
In this work an attempt is made to study the effects of heat and mass transfer on MHD free convective viscous incompressible electircally conducting fluid boundary layer flows past a vertical plate.In chapter 1 the effects of radiation absorption and chemical reaction on unsteady MHD free convective flow through porous medium is studied.In chapter 2 the effect of magnetic field and radiation on unsteady MHD flow in the presence of thermal diffusion.In chapter 3 thermal diffusion on unsteady heat and mass transfer flow with variable temperature and mass diffusion is studied.In chapter 4 the effects of heat source, radiation absorption on heat and mass transfer flow past a linearly accelerated vertical plate in the presence of first order chemical reaction is studied.In chapter 5 the effects of chemical reaction and radiation on hydrodynamic flow discussed in two cases (i) and (ii) for both magnetic and non-magnetic cases.In all above chapters the solution for velocity, temperature and concentration fields are obtained using Laplace transform technique and an exact solutions are derived in terms of exponential and complementary error functions.
Leather is an important economic commodity. The feel of the leather invariably decides the quality of the leather. The rate and mode of drying alters the physico-mechanical properties of the leather significantly. Typically, in leather manufacture wet leathers with about 70% moisture levels are subjected to mechanical squeezing operation, samming, for removal of freely held water before subjecting to conventional drying processes to produce leathers with 15– 20% moisture. Experiments are conducted to gain a clear picture of how drying variable affects the mechanical properties of dried leathers. Shorter drying time and proper initial water content are favorable conditions to produce stronger and softer leather. Possibility have been explored of using mass quantity such as drying rate to generalize relationship between drying variables and mechanical properties. From the experiments, it can be concluded that by vacuum drying process stronger and softer leather can be achieved, which will have high tensile strength, grain crack strength and tongue tear strength. Further they would not undergo any wear and tear during finishing processes.
An invaluable guide for problem solving in mass transfer operations This book takes a highly pragmatic approach to providing the principles and applications of mass transfer operations by offering a valuable, easily accessible guide to solving engineering problems. Both traditional and novel mass transfer processes receive treatment. As with all of the books in this series, emphasis is placed on an example-based approach to illustrating key engineering concepts. The book is divided into two major parts. It starts with the principles underlying engineering problems—showing readers how to apply general engineering principles to the topic of mass transfer operations. It then goes on to provide step-by-step guidance for traditional mass transfer operations, including distillation, absorption and stripping, and adsorption, plus novel mass transfer processes. Essential topics for professional engineering exams are also covered. Geared towards chemical, environmental, civil, and mechanical engineers working on real-world industrial applications, Mass Transfer Operations for the Practicing Engineer features: Numerous sample problems and solutions with real-world applications Clear, precise explanations on how to carry out the basic calculations associated with mass transfer operations Coverage of topics from the ground up for readers without prior knowledge of the subject Overview of topics relevant to the ABET (Accreditation Board for Engineering and Technology) for those taking the Professional Engineering (PE) exams Appendix containing relevant mass transfer operation charts and tables
This broad-based book covers the three major areas of Chemical Engineering. Most of the books in the market involve one of the individual areas, namely, Fluid Mechanics, Heat Transfer or Mass Transfer, rather than all the three. This book presents this material in a single source. This avoids the user having to refer to a number of books to obtain information. Most published books covering all the three areas in a single source emphasize theory rather than practical issues. This book is written with emphasis on practice with brief theoretical concepts in the form of questions and answers, not adopting stereo-typed question-answer approach practiced in certain books in the market, bridging the two areas of theory and practice with respect to the core areas of chemical engineering. Most parts of the book are easily understandable by those who are not experts in the field. Fluid Mechanics chapters include basics on non-Newtonian systems which, for instance find importance in polymer and food processing, flow through piping, flow measurement, pumps, mixing technology and fluidization and two phase flow. For example it covers types of pumps and valves, membranes and areas of their use, different equipment commonly used in chemical industry and their merits and drawbacks. Heat Transfer chapters cover the basics involved in conduction, convection and radiation, with emphasis on insulation, heat exchangers, evaporators, condensers, reboilers and fired heaters. Design methods, performance, operational issues and maintenance problems are highlighted. Topics such as heat pipes, heat pumps, heat tracing, steam traps, refrigeration, cooling of electronic devices, NOx control find place in the book. Mass transfer chapters cover basics such as diffusion, theories, analogies, mass transfer coefficients and mass transfer with chemical reaction, equipment such as tray and packed columns, column internals including structural packings, design, operational and installation issues, drums and separators are discussed in good detail. Absorption, distillation, extraction and leaching with applications and design methods, including emerging practices involving Divided Wall and Petluk column arrangements, multicomponent separations, supercritical solvent extraction find place in the book.
In this research project a method has been analysed through CFD technique to obtain steady state heat transfer in nuclear fuel rod assembly and the local heat transfer coefficients of carbon dioxide at supercritical pressures in triangular channel under cooling conditions is presented through the numerical simulation. The CFD code Ansys CFX has been used to simulate the convective heat transfer coefficient of the triangular channel. Supercritical CO2 heat-transfer data were obtained at reactor-equivalent conditions at three pressures above the critical point (7.6, 8.4 and 8.8 MPa), mass fluxes from 840 to 3000 kg/m2s,heat fluxes up to 600 kW/m2 and inlet temperatures from 20 to 40?C. The effects of pressure, mass flux of supercritical CO2, rod diameter, and heat flux on heat transfer are investigated. The computational results showed that the sharply varying thermo physical properties of carbon dioxide have a significant role on the local heat transfer coefficient which varies significantly along the triangular channel and small tube when the CO2 bulk temperatures were within the near-critical region.
Higher energy consumption and storage loss beyond permissible limit are the two most important problems in Indian potato cold stores, which have been hindering with the further growth of this industry. The problems of energy consumption and storage losses are interrelated in nature and have direct relation with the intricacy of the coupled transport phenomena of heat, mass and momentum transfer in bulk-stored potatoes. The heat and mass transfer processes within the bags of potato in a stack depend on product properties, and operating as well as geometric parameters of the cold store. All these parameters influence the mechanism of heat and mass transfer in the storage facility, which ultimately affect the temperature of the packed product and humidity around the product.Therefore, an in-depth analysis of the relative importance of these parameters on the mechanism of transport phenomena within the bulk-stored potatoes in a cold store helps to overcome the problems of higher energy consumption and storage losses beyond permissible limit.
This book provides a , student oriented investigation to numerical convective heat transfer analysis. basic ideas are discussed in detail and full devlopement of all importent results is provided. the assumptions on which studies of convective heat transfer problems are thoroughtly discussed. The book contains many worked examples that explained the numerical methods of cooling by natural and mixed convection. Highlights of the book include: 1. A literature review concerning different enclosures shows that some several works have considered the problem of natural and mixed convection . 2. Mathematical and numerical procedure for convective heat transfer 3. A detailed discussion of the numerical investigations of natural and mixed convetion. This book, which can use to support of courses on natural and mixed convection phenomena.
Modelling of processes of formation of steel ingots is carried out on the basis of solutions of multidimensional nonlinear differential equations. The process of the formation of ingots accompanied by complex turbulent processes. Therefore, this scientific papaer is devoted to describing the equations, boundary conditions, the choice of the mathematical model for the simulation of hydrodynamic processes and heat and mass transfer in the formation ingot. Much attention is paid to the software implementation and visualization of mathematical models
Interferometry is a method that measures the displacement between regions of different refractive indices.It therefore has many applications in the measurement of fluid flows, photo elastic stresses, surfaces and thin films and vibrations.By extracting the phase information from the fringe pattern, a quantitative height map is produced.The height map may represent a surface profile, displacement,or the optical path difference through a phase object.The windowed Fourier transform (WFT) method is used to analyze the same experiments to study heat and mass transfer. In this method, a Fourier transformation is applied on the fringes at two different stages: initially, during the filtration of the non-zero peaks and then on the wrapped phase image. A theoretical approach and experimental models are proposed to estimate the experimental thermal time of the Mach Zehnder interferometry experiment that deals with coupling between heat and mass transfer phenomena. Mach-Zehnder Interferometry has been found to be an accurate and precise experimental tool to visualize the thermodiffusion phenomenon inside the parallelepiped cavity, when a thermal gradient is applied at its two opposite sid