Download Analytical Methods for Heat Transfer and Fluid Flow Problems by Bernhard Weigand PDF

By Bernhard Weigand

This booklet describes beneficial analytical tools via utilising them to real-world difficulties instead of fixing the standard over-simplified lecture room difficulties. The e-book demonstrates the applicability of analytical tools even for complicated difficulties and courses the reader to a extra intuitive figuring out of techniques and solutions.

Although the answer of Partial Differential Equations by way of numerical equipment is the traditional perform in industries, analytical tools are nonetheless vital for the serious overview of effects derived from complex computing device simulations and the advance of the underlying numerical suggestions. Literature dedicated to analytical tools, notwithstanding, usually makes a speciality of theoretical and mathematical features and is hence dead to such a lot engineers. Analytical equipment for warmth move and Fluid circulate difficulties addresses engineers and engineering students.

The moment variation has been up-to-date, the chapters on non-linear difficulties and on axial warmth conduction difficulties have been prolonged. And labored out examples have been included.

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Extra info for Analytical Methods for Heat Transfer and Fluid Flow Problems

Example text

On the other hand, the thermal entrance of a hydrodynamically fully developed turbulent pipe or channel flow has a much broader technical relevance and has not yet been investigated in such detail in the past. Furthermore, this kind of application leads to complicated eigenvalue problems and can be considered as a challenging case for any analytical method. Of course, the present analysis holds also for laminar pipe and channel flows, as stressed in the following sections when relevant. In addition, the program for the solution of the eigenvalue problems, described in Appendix C, can be used for both laminar and turbulent flows.

Increasing values of the Reynolds number lead to an enhanced turbulent mixing within the cross sectional area of the duct and, therefore, to a flatter velocity profile. 2 shows predicted and measured velocity profiles for hydrodynamically fully developed turbulent flows in a pipe and in a planar channel, respectively. In Fig. 2, the velocity is scaled by its maximum value in the center. The figure on the left hand side shows a calculation for the flow in a planar channel. It can be seen that the predictions using the simple mixing length model agree quite well with the measurements of Laufer (1950).

Dy  ¼ B þ B2 À AC A dx pffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi. dy  ¼ B À B2 À AC A dx ð2:21Þ These two equations are known as the characteristic equations. They prescribe the functional relationship between the families of curves in the xy-plane for which ξ = const. and η = const. This means that a change of variables according to n ¼ f1 ðx; yÞ g ¼ f2 ðx; yÞ ð2:22Þ will transform Eq. 1) into its standard form. From Eq. 21) it is apparent that there are three cases to be considered: Case 1 Hyperbolic equation (B2 − AC) > 0 The preceding analysis results in a canonical form for the hyperbolic equation.

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