Ejercicio3.docx

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1._ Un grupo adimensional que se utiliza en estudios de transferencia de calor es el nΓΊmero de Prandtl dado por:

π‘ƒπ‘Ÿ =

𝐢𝑃 πœ‡ 𝐾

CuΓ‘l es la representaciΓ³n dimensional de K en los sistemas π‘€πΏπ‘‡πœƒ y πΉπΏπ‘‡πœƒ de dimensiones bΓ‘sicas respectivamente.

Sistema π‘€πΏπ‘‡πœƒ [𝐢𝑝 ] = 𝐿2 𝑇 βˆ’2 πœƒ βˆ’1 [πœ‡] = π‘€πΏβˆ’1 𝑇 βˆ’1 [π‘ƒπ‘Ÿ] = 1

[𝐾] =

𝐢𝑃 πœ‡ π‘ƒπ‘Ÿ

=

𝐿2 𝑇 βˆ’2 πœƒβˆ’1 π‘€πΏβˆ’1 𝑇 βˆ’1 1

= 𝑀𝐿𝑇 βˆ’3 πœƒ βˆ’1

[𝐾] = ? [𝐾] = 𝑀𝐿𝑇 βˆ’3 πœƒ βˆ’1

Sistema πΉπΏπ‘‡πœƒ [𝐢𝑝 ] = 𝐿2 𝑇 βˆ’2 πœƒ βˆ’1 [πœ‡] = πΉπΏβˆ’2 𝑇 [π‘ƒπ‘Ÿ] = 1

[𝐾] =

𝐢𝑃 πœ‡ π‘ƒπ‘Ÿ

=

𝐿2 𝑇 βˆ’2 πœƒβˆ’1 πΉπΏβˆ’2 𝑇

[𝐾] = ? [𝐾] = 𝐹𝑇 βˆ’1 πœƒ βˆ’1

1

= 𝐹𝑇 βˆ’1 πœƒ βˆ’1

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