tailieunhanh - HEAT TRANSFER FUNDAMENTALS P1

The exchange of energy or heat resulting from the kinetic energy transferred through the direct impact of molecules is referred to as conduction and takes place from a region of high energy (or temperature) to a region of lower energy (or temperature). | CHAPTER 43__ HEAT TRANSFER FUNDAMENTALS G. P. Bud Peterson Executive Associate Dean and Associate Vice Chancellor of Engineering Texas A M University College Station Texas SYMBOLS AND UNITS 1367 The Log Mean Temperature Difference CONDUCTION HEAT TRANSFER 1369 RADIATION HEAT Thermal Conductivity One-Dimensional SteadyState Heat Conduction Two-Dimensional SteadyState Heat Conduction Heat Conduction with Convection Heat Transfer on the Boundaries Transient Heat Conduction CONVECTION HEAT TRANSFER 1370 1375 1377 1381 1383 1385 TRANSFER Black-Body Radiation Radiation Properties Configuration Factor Radiative Exchange among Diffuse-Gray Surfaces in an Enclosure Thermal Radiation Properties of Gases BOILING AND Forced Convection Internal Flow Forced Convection External Flow Free Convection 1385 1393 1397 CONDENSATION HEAT TRANSFER Boiling Condensation Heat Pipes 1400 1400 1400 1404 1407 1410 1415 1417 1420 1423 1424 SYMBOLS AND UNITS A area of heat transfer Bi Biot number hUk dimensionless C circumference m constant defined in text Cp specific heat under constant pressure J kg K D diameter m e emissive power W m2 f drag coefficient dimensionless F cross flow correction factor dimensionless Fj_j configuration factor from surface i to surface j dimensionless Fo Fourier number atA2 V2 dimensionless _A7- radiation function dimensionless G irradiation W m2 mass velocity kg m2- sec g local gravitational acceleration m sec2 gc proportionality constant 1 kg m N sec2 Gr Grashof number gL2j3Atlv2 dimensionless h convection heat transfer coefficient equals q AAT W m2 K hfg heat of vaporization J kg J radiocity W m2 k thermal conductivity W m K Mechanical Engineers Handbook 2nd ed. Edited by Myer Kutz. ISBN 0-471-13007-9 1998 John Wiley Sons Inc. 1367 1368 HEAT TRANSFER FUNDAMENTALS K wick permeability m2 L .