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

By Bernhard Weigand

ISBN-10: 3540222472

ISBN-13: 9783540222477

ISBN-10: 3540684662

ISBN-13: 9783540684664

Although the answer of Partial Differential Equations by means of numerical tools is the traditional perform in industries, analytical equipment are nonetheless very important for the serious evaluation of effects derived from complicated laptop simulations and the advance of the underlying numerical ideas. Literature dedicated to analytical tools, although, usually makes a speciality of theoretical and mathematical facets and is hence lifeless to so much engineers. Analytical tools for warmth move and Fluid stream Problems addresses engineers and engineering scholars. It describes worthwhile analytical equipment by way of employing them to real-world difficulties instead of fixing the standard over-simplified school room difficulties. The ebook demonstrates the applicability of analytical tools even for advanced difficulties and publications the reader to a extra intuitive realizing of methods and solutions.

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

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75) If we have a closer look at this equation, it can be seen that the function H ( ) tends to infinity for t → ∞ if C1 > 0 . However, this would not lead to a physically meaningful solution for the problem, because the temperature would tend to infinity for large times. For C1 = 0 , Eq. 75) results in a constant for H ( ) and the time dependence of the solution would be lost. Therefore, we can conclude that the constant C1 must always be smaller than zero for the problem under consideration. This can be expressed by replacing the constant by C1 = −λ 2 .

135) where the whole equation has been divided by the function N ( assume that ) . 136) ( ) Eq. 134) can be written as A( ) H ′′ (ξ ) D (ξ η ) H ′ ( ) + + f ( )= N( ) H (ξ ) N (ξ η ) H ( ) 1 C( ) G ′′ (η ) E (ξ η ) G ′ ( ) − − − f ( ) = const. 137) The left side of this equation should now only be a function of ξ and the right side of the equation should only be a function of η. 138) The present analysis might be very helpful in order to check in advance if the method of separation of variables can be applied to the problem under consideration.

19) we obtain from Eqs. 21) A 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.. 22) 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. For this case we have two real characteristics, which can be obtained from the differential Eqs.

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


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