The mass transfer rate per unit area of surface is then given by. To find a theory behind the empirical masstransfer correlations e. Derivation of the diffusion equation using ficks law. The total mass concentration is the density of the mixture which is the total mass of the mixture per unit volume. It also includes chapters on heat transfer by conduction, heat transfer by radiation, heat transfer by convection, mass transfer, and objective type question bank. Mass transfer may take place in a single phase or over phase boundaries in multiphase systems. The derivation will be repeated here in summarized form. If the temperature t is a function of the height z, then before integration you have to get the relation between t and z then substitute into equation 2. Departmentofmathematics universityofcalifornia,berkeley september,2001version 1. Me6502 heat and mass transfer syllabus notes question bank.
Besides, heat and mass transfer must be jointly considered in some cases like evaporative cooling and ablation. Pdf me6502 heat and mass transfer hmt books, lecture. Therefore instead of analysis of mass transfer using ficks law, it is more convenient to write the molar flux of a using mass transfer equation of the form below. In this equation v is the mass average velocity defined by v 1. If the system does not move with a velocity and has no change in elevation. The conservation equation is written in terms of a speci. Mass transfer coefficient concept and classifications nptel. This document is highly rated by students and has been viewed 285 times. The subject of mass transfer studies the relative motion of some chemical species with respect to others i.
Pdf lecture notes on heat and mass transfer for msc students of mechanical engineering find, read and cite all the research you need on researchgate. The local gasphase mass transfer coefficient for the sublimation of ice. Heat transfer processes set limits to the performance of aerospace components and systems and the subject is one of an enormous range of application. Such models should connect mass transfer and fluid flow. Similarities and differences between mass transfer and heat transfer. My notes contained some part of the reference books i used during my studies, internet references, lecture notes and things mentioned by the lecturers in class. Such unit operations like absorption, rectification, extraction and adsorption, in which mass transfer plays the. What if we want to consider the effects of transient perhaps. Download link is provided and students can download the anna university me6502 heat and mass transfer hmt syllabus question bank lecture notes syllabus part a 2 marks with answers part b 16 marks question bank with answer, all the materials are listed below for the students to make use of it and score good maximum marks with our study materials. Fluid flow without mass transfer is not part of the mass entropy transfer field but of fluid mechanics. Gaitonde, department of mechanical engineering, iit bombay. The general differential equation for mass transfer of component a, or the equation of continuity of a, written in rectangular coordinates is initial and boundary conditions to describe a mass transfer process by the differential equations of mass transfer the initial and boundary conditions must be specified.
We already have encountered the mass transfer coefficient, defined in a manner analogous to the heat transfer coefficient. Lecture 33 introduction to mass transfer 1 youtube. Momentum and collisions video questions and notes name. Departmentofmathematics universityofcalifornia,berkeley september,2001version. In the vast majority of engineering problems, mass transfer involves at least one fluid phase gas or liquid. It is a parameter that is used to describe the ratio between the actual. What if we want to know the transient concentration pro. Equations for heat transfer and mass transfer notes edurev. If you added up all the momentum of all the pieces of the ornament and all the marbles, they would equal the. Instantaneous point source deposition, one, two, tri dimensional. Radiation heat transfer radiation differs from conduction and convection heat t transfer mechanisms, in the sense that it does not require the presence of a material medium to occur. Chapter 4 3 now the conservation of energy principle, or the first law of thermodynamics for closed systems, is written as qw u ke penet net. Fundamentals of mass transfer when a single phase system contains two or more species whose concentrations are not uniform, mass is transferred to minimize the concentration differences within the system. At a point a x al, y ag, we can write the mass transfer equations for each of the phases.
In a multiphase system mass is transferred due to the chemical potential differences between the. Mass transfer basic theories for mass transfer coefficients 92 9. Gasliquid interface gas liquid gas transfer to the liquid is absorption gas transfer to the gas phase is stripping or. Pdf heat and mass transfer by rk rajput pdf free download. Mass transfer describes the transport of mass from one point to another and is one of the main pillars in the subject of transport phenomena. Download me6502 heat and mass transfer lecture notes, books, syllabus parta 2 marks with answers me6502 heat and mass transfer important partb 16 marks questions, pdf books, question bank with answers key. The notes are intended to describe the three types of heat transfer and provide. Heat transfer equation sheet heat conduction rate equations fouriers law. Other mass transfer operations include distillation, humidification, liquidliquid extraction, adsorption and ion exchange, and so on. Mass leaving volume in t the control mass entering interval t in a time control volume mass in the change of a j 1.
For steady state and constant area of mass transfer na,z constant. This document is highly rated by chemical engineering students and has been viewed 1543 times. Molar flux, n a mass transfer coefficient x driving force. Dec 26, 2017 apr 02, 2020 ppt introduction to mass transfer and diffusion chemical engineering notes edurev is made by best teachers of chemical engineering. This page to condensed lecture notes and multimedia resources as it has been presented in class by prof. Mass transfer operations i introduction video youtube. The book includes chapters on the basic concepts of heat and mass transfer. Use the rate equation with mass transfer coefficients to determine.
Burghardt encyclopedia of life support systems eolss gases and liquids are all associated with mass transfer. Chemical engineering and chemical process technology vol. M e 6502 notes syllabus all 5 units notes are uploaded here. Mass transfer theories for mass transfer coefficients. Introduction to engineering heat transfer these notes provide an introduction to engineering heat transfer. It means the concentration of the diffusing species at the start t 0 expressed in mass or molar units. Note the analogy to heat transfer, where in module 6 convection, for the.
The conservation equation is written on a per unit volume per unit time basis. It is the movement of mass from a higher to a lower concentration due to random molecular motion. You have a device where a number of system properties can be varied. Mass transfer a tables b exact solutions of laminarboundarylayer equations. Ppt introduction to mass transfer and diffusion chemical. Mass transfer plays a vital role in many reaction systems. So, in this lecture, we will consider concept of mass transfer coefficient. Dec 11, 2008 lecture series on heat and mass transfer by prof. We use cookies to make interactions with our website easy and meaningful, to better. Chapter summarymodes of mass transfer molecular diffusion 1.
Heat transfer is also a relatively easy subject to understand, conceptually, and one that is. Numerical methods in heat, mass, and momentum transfer. Pdf me6502 heat and mass transfer lecture notes, books. Mass transfer introduction to chemical and biological. Also very important when analyzing the impact of pollutants on the environment, such as discharging partially treated wastewaters to the stream.
Doran, in bioprocess engineering principles second edition, 20. Jun 20, 2015 anna university me6502 heat and mass transfer syllabus notes 2 marks with answer is provided below. As usual, the basic study first focuses on homogeneous nonreacting systems with welldefined boundaries not only in mass transfer, but in heat transfer and in fluid mechanics, touching upon. Pdf lecture notes on heat and mass transfer find, read and cite all the research you need on researchgate. The total mass concentration is related to the species mass concentration by. Department of chemical and biomolecular engineering. Aug 16, 2015 apr 12, 2020 equations for heat transfer and mass transfer notes edurev is made by best teachers of. As the distance between the reactants and the site of reaction becomes greater, the rate of mass transfer is more likely to influence or control the conversion rate. You are interested in experimentally determining the mass transfer coefficient for a particular application. To describe a mass transfer process by the differential equations of mass transfer the initial and boundary conditions must be specified. The common denominator in mass transfer processes is that species fluxes occur within a phase when there are compositionvariations within that phase.
We are providing heat and mass transfer by rk rajput pdf for. The above equation is the barometric equation and is used to calculate the pressure at any level above ground. The usual way to make the best of both approaches is to first consider heat transfer without mass transfer, and present at a later stage a briefing of similarities and differences between heat. The mass balance for this case can be written in the following form.
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