Convective Heat Transfer: Solved Problems
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Physical description xvii, p.
Online Available online. Engineering Library Terman.
F Unknown. More options. Find it at other libraries via WorldCat Limited preview. Bibliography Includes bibliographical references p.
Summary This book on convective heat transfer phenomena differs in many respects from existing books, particularly from the pedagogical point of view. Each chapter begins with a brief yet complete presentation of the related topic. On the other hand, nucleate boiling at the surface effectively disrupts the stagnant layer and therefore nucleate boiling significantly increases the ability of a surface to transfer thermal energy to bulk fluid.
Convective Heat Transfer: Solved Problems - PDF Drive
As a result, the convective heat transfer coefficient significantly increases and therefore at higher elevations, the temperature difference T Zr,1 — T bulk significantly decreases. Theodore L. Bergman, Adrienne S. Lavine, Frank P.
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ISBN: Heat and Mass Transfer. Yunus A. McGraw-Hill Education, Fundamentals of Heat and Mass Transfer. Nuclear and Reactor Physics: J. Lamarsh, Introduction to Nuclear Reactor Theory, 2nd ed. Lamarsh, A. Baratta, Introduction to Nuclear Engineering, 3d ed. This produces the idea of an overall heat transfer coefficient Each overall heat transfer coefficient is determined for a specific mean area and temperature difference.
For the layer problem being discussed, the overall coefficient is given by The overall coefficient U can be defined in terms of the inside or the outside wall area. Both values work the same, but the numbers for U i and U o will be different. Real problems may not be as simple as three layers in series.
Example – Convection – Problem with Solution
It is usually wise to include resistances for scaling or fouling of the wall, contact resistances between two solid layers, etc. The heat transfer coefficient depends on fluid properties heat capacity, viscosity, thermal conductivity, density and flow properties pipe diameter, velocity. Dimensional analysis shows the relation between the variables: and the dimensionless groups involved: the Reynolds Number , the ratio of convective to molecular transport; the Prandtl Number , the ratio of momentum to heat transfer; and the Nusselt Number.
Most of the correlations will thus take the form: The correction factors can be used to adjust for thermal variation in properties, tube curvature, entrance and exit effects, etc.
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Choice of a correlation depends on the flow regime, geometry, and whether or not a phase change occurs.