By Greg F. Naterer
Generally revised and punctiliously up-to-date, this well known textual content de-emphasizes excessive point arithmetic in desire of powerful, exact modeling. Real-world examples enlarge the speculation and exhibit the best way to use derived equations to version actual difficulties. routines that parallel the examples construct readers' self belief and get ready them to confront the extra advanced events they come upon as execs.
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Extra resources for Heat Transfer in Single and Multiphase Systems (Mechanical and Aerospace Engineering Series)
Difference between thermocouple reading and gas temperature) is expected in the measurement of the gas temperature? How can this temperature measurement error be reduced? Conduction losses through the thermocouple wire can be neglected. Heat is generated electrically at a certain rate within an overhead power transmission cable. Air flows past the cable with a freestream temperature and convection coefficient of (/68C and 80 W/m2K, respectively. For a specified copper cable (3-cm diameter), estimate the required heat generation rate (per unit length of cable) to maintain the surface temperature above at least 08C.
1940), Bejan (1993), Incropera and Dewitt (1990), and others. Also, the Standards of the Tubular Exchange Manufacturers Association (8th edition, New York, 1999) provides these results, which can be given as algebraic expressions or graphical representations. , 1940), can be expressed by pﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃ [ R 2 ' 1=(R ( 1)] × log[(1 ( P)=(1 ( PR)] F0 (10:15) pﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃ pﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃ log[(a ' R 2 ' 1)=(a ( R 2 ' 1)] For two shell passes and any multiple of four tube passes, pﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃ [ R 2 ' 1=(2R ( 2)] × log[(1 ( P)=(1 ( PR)] F0 pﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃ pﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃ log[(a ' b ' R 2 ' 1)=(a ' b ( R 2 ' 1)] (10:16) where a0/(2/P )Á/1Á/R and b0/(2/P )[(1 Á/P )(1 Á/PR )]1/2.
The temperature of the incoming cold fluid stream increases due to heat transfer from the hot stream flowing in the opposite direction. If the same inlet and outlet temperatures are considered, then the log mean temperature difference of the counterflow arrangement exceeds the difference for a parallel flow heat exchanger. Thus, a counterflow heat exchanger is usually considered to be more effective, since a smaller surface area is required to achieve the same heat transfer (assuming equivalent heat transfer coefficients between the fluid streams).