By Volker Simon, Bernhard Weigand, Hassan Gomaa

This monograph presents the basics of dimensional research and illustrates the strategy via a variety of examples for a large spectrum of functions in engineering. The ebook covers completely the basic definitions and the Buckingham theorem, in addition to the alternative of the process of uncomplicated devices. The authors additionally contain a presentation of version thought and similarity ideas. the objective viewers basically contains researchers and practitioners however the publication can also be compatible as a textbook at college level.

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**Additional resources for Dimensional Analysis for Engineers**

**Example text**

In case that the additional dimensional constant C is not introduced as a variable in Eq. 4 Choice of the Base System L M F T 21 M x g q R 1 0 1 0 0 0 0 −1 −2 0 1 1 −3 1 0 0 1 0 0 0 Now n ¼ 5 and r ¼ 4, and one obtains only one dimensionless product Y 1 ¼ M ¼ const: gxR2 ð1:70Þ The fact that the constant C is not included as a variable implies that Newton’s Second Law in the considered problem is irrelevant, so that an acceleration free flow is considered. However that is approximately applicable only for very small rotational Reynolds numbers in the case when the friction forces are much larger than the inertial forces.

For Eq. 75) to be a dimensionally homogeneous equation, the dimensional constant kB must have the dimension ½k ¼ L2 M 1 T À2 HÀ1 and it must be introduced as an additional variable, so that Eq. 71) takes the form Q_ ¼ f ðD#; U; k; q c; d; kB Þ ð1:80Þ The dimension matrix is L M T H Q_ D# U k qc d kB 2 1 −3 0 0 0 0 1 1 0 −1 0 1 1 −3 −1 −1 1 −2 −1 1 0 0 0 2 1 −2 −1 24 1 Some Fundamentals of Dimensional Analysis Just as in the ½LMT system one obtains three dimensionless quantities with Y 1 Y 2 ¼ Q_ ; k D# d ð1:81Þ ¼ qcU d k ð1:82Þ ¼ q c d3 ; kB ð1:83Þ and Y 3 so that Eq.

38) are typically referred to as “long gravity waves”. e. wave motion that is significantly influenced by gravity. The interface between the two fluids is always affected by the surface tension r. Under silent conditions, the pressure difference is proportional to the surface tension and the mean curvature of the surface. A wave on the surface causes a pressure difference across the surface, inducing a motion of the adjacent fluid. We therefore suspect, that the surface tension can cause wave motion, and the regarded phase velocity takes a functional relationship of the form c ¼ f ðg; q; k; rÞ: ð3:39Þ The dimension matrix then takes the form L M T c g q k r 1 0 −1 1 0 −2 −3 1 0 1 0 0 0 1 −2 from which the two dimensionless products Y 1 c ¼ pﬃﬃﬃﬃﬃ gk and Y 2 ¼ r qgk2 ð3:40Þ are obtained.