Heat And Mass Transfer By Ds Kumar Pdf 371

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Heat and Mass Transfer by D. S. Kumar: A Comprehensive Textbook for Engineering Students

Heat and mass transfer are fundamental phenomena that occur in many engineering applications, such as power plants, refrigeration systems, heat exchangers, and combustion engines. Understanding the principles and methods of heat and mass transfer is essential for designing and optimizing these systems.

One of the most popular and widely used textbooks on heat and mass transfer is Heat and Mass Transfer (SI Units) by D. S. Kumar, published by S.K. Kataria & Sons in 2015[^1^]. This book covers the basic concepts and theories of heat and mass transfer, as well as the practical aspects and applications of various modes of heat transfer, such as conduction, convection, radiation, boiling, condensation, and mass transfer.

The book is divided into 16 chapters, each with a clear introduction, detailed derivations, solved examples, unsolved problems, multiple choice questions, and review questions. The book also includes appendices with useful tables and charts of thermophysical properties and heat transfer coefficients.

The book is written in a simple and lucid style, with an emphasis on physical understanding and problem-solving skills. The book is suitable for undergraduate and postgraduate students of mechanical engineering, chemical engineering, aerospace engineering, and other related disciplines.

One of the features of this book is that it provides a PDF version of the book online for free download[^2^]. The PDF version has 433 pages and contains all the contents of the printed book. The PDF version also has a page number 371 that corresponds to chapter 11 on radiation heat transfer[^2^]. This page covers the topics of radiation intensity, radiation laws, blackbody radiation, gray body radiation, view factors, radiation exchange between black surfaces, radiation exchange between gray surfaces, radiation shields, and electrical network analogy.

If you are looking for a comprehensive and accessible textbook on heat and mass transfer that covers both theory and practice, you may want to check out Heat and Mass Transfer (SI Units) by D. S. Kumar. You can find more information about the book on Google Books[^1^] or download the PDF version for free from Scribd[^2^].Okay, I'll try to continue the article. Here is a possible example:

Radiation Heat Transfer: Basic Concepts and Laws

Radiation is the mode of heat transfer that does not require any medium for its propagation. Radiation heat transfer occurs when electromagnetic waves, such as visible light, infrared, ultraviolet, and X-rays, carry energy from one body to another. Radiation heat transfer is important in many engineering applications, such as solar energy, thermal insulation, furnaces, and spacecraft reentry.

The basic concepts and laws of radiation heat transfer are discussed in this section. The following terms and definitions are used:

Radiant energy: The energy emitted, transferred, or received in the form of electromagnetic waves.

Radiant flux: The rate of radiant energy transfer per unit time. It is also called radiant power or irradiation. The SI unit of radiant flux is watt (W).

Radiant intensity: The rate of radiant energy transfer per unit time per unit solid angle. The SI unit of radiant intensity is watt per steradian (W/sr).

Radiosity: The rate of radiant energy leaving a surface per unit area. It is also called emissive power or exitance. The SI unit of radiosity is watt per square meter (W/m).

Irradiation: The rate of radiant energy incident on a surface per unit area. It is also called incident flux or radiant exposure. The SI unit of irradiation is watt per square meter (W/m).

Radiant heat flux: The net rate of radiant energy transfer across a surface per unit area. It is also called net radiation or net irradiation. The SI unit of radiant heat flux is watt per square meter (W/m).

The following laws govern the radiation heat transfer between bodies:

Planck's law: This law gives the spectral distribution of the radiant intensity of a blackbody as a function of wavelength and temperature.

Stefan-Boltzmann law: This law gives the total radiosity of a blackbody as a function of temperature.

Wien's displacement law: This law gives the wavelength at which the spectral radiosity of a blackbody is maximum as a function of temperature.

Kirchhoff's law: This law states that the emissivity and absorptivity of a body are equal at the same wavelength and temperature.

Lambert's cosine law: This law states that the radiant intensity of a diffuse emitter is proportional to the cosine of the angle between the normal to the surface and the direction of emission.

Snell's law: This law gives the relation between the angles of incidence and refraction when radiation passes through an interface between two media with different refractive indices.

Fresnel's equations: These equations give the reflectivity and transmissivity of a surface as functions of the angles of incidence and refraction and the refractive indices of the media.

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