Fundamentals of convection heat transfer 1 of 3 in this lecture an introduction is given on the fundamentals of convection. Moderate mass qualities annular flow core of the flow consists of vapor only, and liquid adjacent to the walls. The main difference between mass transfer and diffusion is that mass transfer may or may not occur across a concentration gradient whereas diffusion occurs across a concentration gradient. Advanced heat and mass transfer indian institute of. Such unit operations like absorption, rectification, extraction and adsorption, in which mass transfer plays the. Pdf heat and mass transfer by rk rajput pdf free download. Hear and mass transfer is a comprehensive textbook for the students of mechanical engineering and a mustbuy for the aspirants of different entrance. Convective heat and mass transfer kays solution manual free. Mass transfer boundary layer theory 93 in addition to this, fluidsolid interfaces have been investigated intensely with respect to heat transfer. A new surfacerenewalstretch srs model was developed to correlate experimental data for the timeaverage overall mass transfer coefficient, k l, av, in liquidliquid and gasliquid mass transfer systems. In the absorption of gases from bubbles or absorption by wettedwall columns, the mass. Fundamentals of convection heat transfer 1 of 3 in this lecture an introduction is given on the fundamentals of. Departmentofmathematics universityofcalifornia,berkeley september,2001version.
Advanced heat and mass transfer mechanical engineering at. This page to condensed lecture notes and multimedia resources as it has been presented in class by prof. Nptel chemical mass transfer operation 1 joint initiative of iits and iisc funded by mhrd page 1 of 6 module 3. The mass equa tion is an expression of the conservation of mass principle. Chemical engineering and chemical process technology vol. Sukhatmes course on heat and mass transfer, based on incropera. The navierstokes equations are based on the assumption that the fluid, at the scale of interest, is a continuum a continuous substance rather than discrete particles. Very near the wall, the fluid motion is smooth and laminar, and molecular conduction and shear are important. Nptel provides elearning through online web and video courses various streams. Burghardt encyclopedia of life support systems eolss gases and liquids are all associated with mass transfer. You are interested in experimentally determining the mass transfer coefficient for a particular application. Mass transfer ii nptel online videos, courses iit video lectures. Most of the industrial processes of mass transfer are unsteady state processes where the gasliquid contact time is too short to achieve steady state condition. Ficks second law of diffusion is a linear equation with the dependent variable being the concentration of the chemical species under consideration.
Deriving the differential equations of mass transfer derives the differential equations for mass transfer using the integral method and shell. Lecture 1 introduction on heat and mass transfer youtube. The bernoulli equationis concerned with the conservation of kinetic, potential, and flow energies of a fluid stream and their conversion to each other in. Heat transfer analysis that utilizes this idealization is known as lumped system analysis, which provides great simplification in certain classes of heat transfer problems without much sacrifice from accuracy. Transfer nptel mass transfer nptel eventually, you will enormously discover. Therefore, mass transfer conditions will also affect heat exchange, heat balance, and operating temperature. Nptel chemical engineering mass transfer operations i. Mass transfer operations i chem e 480 by nptel on iit. Thus, insulating the pipe may actually increase the rate of heat. Derivation of the diffusion equation using ficks law. The total mass concentration is related to the species mass concentration by. You have a device where a number of system properties can be varied.
The thrust is then equal to the exit mass flow rate times the exit velocity minus the free stream mass flow rate times the free stream velocity. Chapter 4 mass and energy balances in this chapter we will apply the conservation of mass and conservation of energy laws to open systems or control volumes of interest. Contact angle and its hysteresis, cassiebaxter equation, surface wettability, superhydrophobic surface, bubble dynamicsrayleigh equation, bubble deformation and collapse, breakup and. We already have encountered the mass transfer coefficient, defined in a manner analogous to the heat transfer coefficient. Heat and mass transfer nptel online videos, courses iit. Chemical and biomolecular engineering clarkson university heat transfer is the study of december 29th, 2018 nptel mechanical engineering heat and mass transfer. Pdf me6502 heat and mass transfer hmt books, lecture. There is scarcely any industrial process that does not require a preliminary purification of raw materials or final separation of products. This solution gives xfor all time given only the initial conditions and the natural frequency, which in this case is. Application of surfacerenewalstretch model for interface.
Gaitonde, department of mechanical engineering, iit bombay. Important definition, fundamental equation of mass transfer, diffusion through variable area ice gate institute is best gate institute. Diffusion of each chemical species occurs independently. A full treatment, which yields the current as a function of potential only, will be expressed by the extended butlervolmer equation, but will require explicit inclusion of mass transfer effects in order to express the concentrations as functions of the potential. In effect, the concentrations are a function of the potential as well. Understand the process of convective mass transfer as due to bulk flow added to diffusion or dispersion. This equation can also be represented as a temperature difference divided by a thermal resistance, which is it can be shown that a very low surface resistance, as might be represented by phase change phenomena, has the effect of imposing the. Mass transfer introduction to chemical and biological. We can make use of this due to the analogy between heat momentum and mass transfer. Nptel syllabus mass transfer operations i web course course outline the importance of mass transfer operations in chemical processes is insightful. In the design of systems, seldom is a surface temperature speci. Heat and mass transfer nptel online videos, courses. The balances will be applied to steady and unsteady system such as tanks, turbines, pumps, and compressors. Jan 07, 20 posts about molecular mass transfer written by happy s5.
Consider a small hot copper ball coming out of an oven fig. Very high heat transfer coefficients mist flow a sharp decrease in the heat transfer coefficient. 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. Nptel video lectures, iit video lectures online, nptel youtube lectures, free video lectures, nptel online courses, youtube iit videos nptel courses. Majumder the importance of mass transfer operations in chemical processes is insightful. Mandal, department of chemical engineering, iit guwahati. Reevaluate the diffusion coefficient of carbon dioxide in air at 20 c and atmospheric pressure using the fuller, schettler, and giddings equation and compare the new value with the one reported in example 2. Heat and mass transfer syllabus pradip duttaiisc, bangalore v118. Mass transfer operations i chem e 480 by nptel on iit guwahati. Reevaluate the diffusion coefficient of carbon dioxide in air at 20 c and atmospheric pressure using the fuller, schettler, and giddings equation and compare the new value with the one reported in example 2 the equation is. Posts about molecular mass transfer written by happy s5. We assume using the reynolds analogy or other approach that the heat transfer coefficient for the fin is known and has the value. Mass transfer is the transport of mass from one place to another.
Mass transfer chemical engineering this lesson explains cascade material balance under the course, mass transfer, for gate chemical engineering. Derivation of the navierstokes equations wikipedia. The total mass concentration is the density of the mixture which is the total mass of the mixture per unit volume. Jul 02, 2014 lecture series on heat and mass transfer by prof. It is a parameter that is used to describe the ratio between the actual. Heat transfer through walls made of layers of di fferent types of materials can be easily found by summing the resistances in series or parallel form, as appropriate. Heat transfer equation sheet heat conduction rate equations fouriers law. Mass transfer ii nptel online videos, courses iit video. Diffusion is the even distribution of solutes throughout the system. Heatmass transfer analogy laminar boundary layer as noted in the previous chapter, the analogous behaviors of heat and mass transfer have been long recognized.
Heat and mass transfer video notes nptel lecturenotes. Try one of the apps below to open or edit this item. Jan 31, 2018 heat and mass transfer by rk rajput pdf free download. Introduction 2 units, definitions, basic modes of heat transfer, thermal conductivity for various types of materials, convection heat transfer coefficient, stefan boltzmans law of thermal radiation. The rate of heat transfer from the cylinder increases with the addition of insulation for r 2 r cr. Nishith verma, department of chemical engineering, iit kanpur. Another necessary assumption is that all the fields of interest including pressure, flow velocity, density, and temperature are differentiable, at least weakly the equations are derived from the basic. Lienhardiv department of mechanical engineering university of houston houston tx 772044792 u. Mass, bernoulli, and energy equations this chapter deals with three equations commonly used in fluid mechanics. Molar flux, n a mass transfer coefficient x driving force. Clasiusclapeyron equation, interaction of vapourliquidsolid phase younglaplace equation, capillary and bond number. Also note that radiative heat transfer and internal heat.
At a point a x al, y ag, we can write the mass transfer equations for each of. Explain saturated flow and unsaturated capillary flow in a porous solid 6. Low mass qualities slug flow bubbles coalesce into slugs of vapor. Mass transfer operations i introduction video youtube. Requirements on mass transfer have to be considered in the design of electrochemical reactors, such as the composition, configuration, and control of electrolyte systems. Nptel chemical mass transfer operation 1 joint initiative of iits and iisc funded by mhrd page 1 of 4 module 3. Chemical engineering thermodynamics free chemical engineering online course on nptel by iit bombay sandip roy the present course aims to introduce the principles of chemical engineering thermodynamics and illustrate their application to design of chemical process plants. Note that the critical radius of insulation depends on the thermal conductivity of the insulation k and the external convection heat transfer coefficient h. 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. Chapter 4 mass and energy balances cal poly pomona. In a multiphase system mass is transferred due to the chemical potential differences between the. Department of chemical and biomolecular engineering.
Have an idea of the relative rates of the different modes of mass transfer. These properties make mass transport systems described by. This assumption also simplifies the calculation of mass, i. The rate expression of water gas shift was based on arrhenius equation as shown in equation 6. F m dot ve m dot v0 the first term on the right hand side of this equation is usally called the gross thrust of the engine, while the second term is called the ram drag. Chapter 1 governing equations of fluid flow and heat transfer.