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

By Bernhard Weigand

This ebook describes valuable analytical equipment by way of utilising them to real-world difficulties instead of fixing the standard over-simplified lecture room difficulties. The booklet demonstrates the applicability of analytical tools even for advanced difficulties and publications the reader to a extra intuitive realizing of ways and solutions.

Although the answer of Partial Differential Equations by means of numerical equipment is the normal perform in industries, analytical tools are nonetheless vital for the severe evaluation of effects derived from complicated laptop simulations and the development of the underlying numerical thoughts. Literature dedicated to analytical tools, even though, usually specializes in theoretical and mathematical points and is for this reason lifeless to so much engineers. Analytical equipment 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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Additional resources for Analytical Methods for Heat Transfer and Fluid Flow Problems

Example text

Show that for the transient part of the solution, the two boundary conditions for ~x ¼ 0 and ~x ¼ 1 are homogeneous. (c) Solve the first problem. What is the steady-state temperature distribution in the slab? (d) Solve the transient problem. What is the complete solution of the problem? 2-6 Consider the transient heat conduction in a slab of length l. The slab has the initial temperature distribution Tð0; xÞ ¼ xÀl ðT2 À T1 Þ þ T2 l At both sides of the slab, the following constant temperatures are applied Tðt; 0Þ ¼ T1 ; Tðt; lÞ ¼ T2 In addition, the slab contains a heat source.

What is the steady-state temperature distribution in the slab? (d) Solve the transient problem. What is the complete solution of the problem? 2-6 Consider the transient heat conduction in a slab of length l. The slab has the initial temperature distribution Tð0; xÞ ¼ xÀl ðT2 À T1 Þ þ T2 l At both sides of the slab, the following constant temperatures are applied Tðt; 0Þ ¼ T1 ; Tðt; lÞ ¼ T2 In addition, the slab contains a heat source. The above given problem can be described by the following partial differential equation (where a and B are constants) @T @ 2 T xBaðT2 À T1 Þ ¼a 2 þ @t @x l3 (a) Make the differential equation and the boundary conditions dimensionless by introducing suitable variables.

Inside the rectangular area, a sink is located with constant sink intensity K. Assuming constant physical properties, the energy equation for this steady-state heat conduction problem is given by  2  @ T @2T 0¼k þ þK @x2 @y2 ð2:97Þ with the boundary conditions T ðb=2; yÞ ¼ T0 ; T ðx; c=2Þ ¼ T0 ; T ðÀb=2; yÞ ¼ T0 T ðx; Àc=2Þ ¼ T0 ð2:98Þ As in the first example we first introduce dimensionless quantities, before proceeding with the solution of the problem. Suitable dimensionless quantities are given by H¼ Fig.

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