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

By Bernhard Weigand

ISBN-10: 3662465922

ISBN-13: 9783662465929

This ebook describes necessary analytical equipment by way of making use of them to real-world difficulties instead of fixing the standard over-simplified school room difficulties. The booklet demonstrates the applicability of analytical equipment even for complicated difficulties and courses the reader to a extra intuitive knowing of ways and solutions.

Although the answer of Partial Differential Equations via numerical tools is the normal perform in industries, analytical equipment are nonetheless vital for the serious evaluation of effects derived from complex laptop simulations and the development of the underlying numerical ideas. Literature dedicated to analytical tools, besides the fact that, usually makes a speciality of theoretical and mathematical facets and is hence lifeless to so much engineers. Analytical tools for warmth move and Fluid circulation difficulties addresses engineers and engineering students.

The moment version 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

Sample text

This mean velocity can be calculated from the measured flow rate in the pipe or channel. For a turbulent hydrodynamically fully developed pipe or channel flow, the turbulent shear stress in the momentum equation in the x-direction has to be modelled by using a turbulence model. For pipe and channel flows, this can be done efficiently by using a simple mixing length model (Cebeci and Bradshaw 1984; Cebeci and Chang 1978; Schlichting 1982). After some algebra, one finally obtains a description of the velocity distribution in the pipe or in the channel of the following form (the reader is referred to Appendix A for a detailed derivation of the Eqs.

This can be expressed by replacing the constant by C1 ¼ Àk2 . Then we obtain for the function H À Á Hð~tÞ ¼ C2 exp Àk2~t ð2:76Þ For the function Gð~xÞ, one obtains the following ordinary differential equation from Eq. 73) G00 ð~xÞ ¼ Àk2 Gð~xÞ ) G00 þ k2 G ¼ 0 ð2:77Þ This equation has to be solved together with the homogeneous boundary conditions given by Eq. 70). It has the trivial solution G = 0 and will have further solutions for selected values of λ. These selected values of λ are called the eigenvalues of Eq.

It is now interesting to evaluate, under which conditions a separation of variables is possible for Eq. 1). In order to answer this question, we consider the transformed Eq. 16) 2 2 2  ðn; gÞ @ u þ 2B  ðn; gÞ @ u  ðn; gÞ @ u þ C A @n@g @g2 @n2  ðn; gÞ @u þ F ðn; gÞu ¼ 0  ðn; gÞ @u þ E þD @n @g ð2:16Þ 40 2 Linear Partial Differential Equations where the new coordinates ξ and η, defined by Eq. 6), have been used. Let us substitute u ¼ H ðnÞ GðgÞ ð2:131Þ into Eq. 16). From this we obtain  ðn; gÞH 00 ðnÞGðgÞ þ 2B  ðn; gÞH ðnÞG00 ðgÞ  ðn; gÞH 0 ðnÞG0 ðgÞ þ C A  ðn; gÞH 0 ðnÞGðgÞ þ E  ðn; gÞH ðnÞG0 ðgÞ þ F H ðnÞGðgÞ ¼ 0 þD ð2:132Þ where the prime indicates the differentiation of the functions HðnÞ and GðgÞ with respect to the independent variable.

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