Sunday, 19 August 2018

HEAT TRANSFER ACE ACADEMY ESE SELF PRACTICE BOOK PART-1 FREE DOWNLOAD PDF WWW.MECHANICALIBRARY.COM

HEAT TRANSFER PART-1

ACE ACADEMY ESE SELF PRACTICE BOOK

FREE DOWNLOAD PDF

MECHANICAL ENGINEERING

Heat Transfer Ace Academy ESE Self Practice Book Part-1 Free Download PDF




ABOUT THE BOOK
  • SUBJECT : HEAT TRANSFER ESE PSU SELF PRACTICE BOOK
  • AUTHOR : SUBJECT EXPERTS OF ACE ENGINEERING ACADEMY - HYDERABAD
  • PUBLISHERS : ACE ENGINEERING PUBLISHERS
  • IDEAL FOR : GATE AND PSU's - MECHANICAL ENGINEERING STREAM

CONTENTS
  1. CONDUCTION
  2. CONVECTION



  • Heat transfer is the term applied to a study in which the details or mechanisms of the transfer of energy in the form of heat are of primary concern. 
  • Examples of heat transfer are many. Familiar domestic examples include broiling a turkey, toasting bread, and heating water. 
  • Industrial examples include curing rubber, heat treating steel forgings, and dissipating waste heat from a power plant.


MECHANISMS OF HEAT TRANSFER
  • Heat transfer is energy in transit, which occurs as a result of a temperature gradient or difference. 
  • This temperature difference is thought of as a driving force that causes heat to flow. Heat transfer occurs by three basic mechanisms or modes: conduction, convection, and radiation. 
  • Coridircriott is the transmission of heat through a substance without perceptible motion of the substance itself. Heat can be conducted through gases, liquids, and solids. In the case of fluids in general, conduction is the primary mode of heat transfer when the fluid has zero bulk velocity. 
  • In opaque solids, conduction is the only mode by which heat can be transferred. The kinetic energy of the molecules ofa gas is associated with the property we call fenipemfure. In a high-temperature region, gas molecules have higher velocities than those in a low-temperature region. 

  • The random motion of the molecules results in collisions and an exchange of momentum and of energy. When this random motion exists and a temperature gradient is present in the gas, molecules in the high temperature region transfer some of their energy, through collisions, to molecules in the low temperature region. 
  • We identify this transport of energy as heat transfer via the diffusive or conductive mode.
  • Conduction of heat in liquids is the same as for gases-random collisions of high-energy molecules with low-energy molecules causing a transfer of heat. 
  • The situation with liquids is more complex, however, because the molecules are more closely spaced. 
  • Therefore, molecular force fields can have an effect on the energy exchange between molecules; that is, molecular force fields can influence the random motion of the molecules.

  • Conduction of heat in solids is thought to be due to motion of free electrons, lattice waves, magnetic excitations, and electromagnetic radiation. 
  • The motion of free electrons occurs only in substances that are considered to he good electrical conductors. The theory is that heat can he transported by electrons (known as the electron gas), which are free to move through the lattice structure of the conductor, in the same way that electricity is conducted. This is usually the case for metals.


DOWNLOAD LINK : HEAT TRANSFER PART-1 ACE ACADEMY ESE SELF PRACTICE BOOK FREE DOWNLOAD PDF www.MechanicaLibrary.com


How to open this book : Download the ZIP file provided in the above download link, unzip the file. Password has been provided inside the ZIP file. Enter the password and open the book. Password applied intentionally for security purposes.

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