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**Fluid mechanical aspects of antisymmetric stress.**
*(English)*
Zbl 0125.15801

### Keywords:

fluid mechanics
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\textit{D. W. Condiff} and \textit{J. S. Dahler}, Phys. Fluids 7, 842--854 (1964; Zbl 0125.15801)

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### References:

[1] | Dahler, Proc. Roy. Soc. (London) A275 pp 504– (1963) |

[2] | Dahler, J. Chem. Phys. 30 pp 1447– (1959) |

[3] | Research Frontiers of Fluid Dynamics, edited by G. Temple and R. J. Seeger (Interscience Publishers, Inc., New York, to be published). |

[4] | Born, Z. Physik 1 pp 221– (1920) |

[5] | Our notation is that of Gibbs where the tensor elements are to be considered as components of the dyadic expanded in the appropriate set of base vectors. |

[6] | See the second part of Ref. 2. |

[7] | J. Serrin, inHandbuch der Physik, edited by S. Flügge, (Julius Springer-Verlag, Berlin, 1959), Vol. VIII, Pt. 1, p. 230,et seq. |

[8] | R. Aris,Vectors, Tensors, and the Basic Equations of Fluid Mechanics(Prentice-Hall, Inc., Englewood Cliffs, New Jersey, 1962), Chap. 5, p. 106,et seq. · Zbl 0123.41502 |

[9] | This can be seen by choosing Cartesian coordinates with thezaxis in the direction of {\(\times\)}u-2{\(\omega\)}0. The matrix associated with the dyadic dual ({\(\times\)}u-2{\(\omega\)}0) will then be of the form 0M0-M00000 while that of Ta will be 0{\(\tau\)}3-{\(\tau\)}1-{\(\tau\)}30{\(\tau\)}2{\(\tau\)}2-{\(\tau\)}20. Isotrophy implies {\(\tau\)}1 = {\(\tau\)}2 = 0 since a rotation through {\(\pi\)} about thezaxis replaces {\(\tau\)}2 and {\(\tau\)}1 by -{\(\tau\)}2 and -{\(\tau\)}1 respectively. This shows that {\(\tau\)}2 = -{\(\tau\)}2 since they must be the same function of the matrix 0M0-M00000 which is unchanged by the rotation. |

[10] | Sather, Phys. Fluids 5 pp 754– (1962) |

[11] | P. Debye,Polar Molecules(Dover Publications, Inc., New York, 1929). · JFM 55.1179.04 |

[12] | To see this, substitute {\(\omega\)}0 = 12{\(\times\)}u in (12) and (13). Then subject to the stated restrictions one finds that 0 = -P+{\(\zeta\)}({\(\times\)}({\(\times\)}u))+({\(\phi\)}+13{\(\eta\)}-{\(\zeta\)})()+({\(\zeta\)}+{\(\eta\)})2u+{\(\rho\)}fP+({\(\phi\)}+13{\(\eta\)})()+{\(\eta\)}2u+{\(\rho\)}f, (12) 0 = ({\(\nu\)}2+13{\(\nu\)}1)({\(\times\)}u))+({\(\nu\)}1+{\(\nu\)}2)2({\(\times\)}u){\(\nu\)}1+{\(\nu\)}2)2({\(\times\)}u). (13) Equation (13) is identical to the equation obtained by taking the curl of (12), whereas (12) is just the Navier-Stokes equation for a structureless fluid. Thus {\(\omega\)}0 = 12{\(\times\)}u satisfies the spin equation (13) wheneverusatisfies the Navier-Stokes equation for a structureless fluid. These solutions for {\(\omega\)}0 andusatisfy both (12) and (13). |

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