Railways Technical Ability Fluid Mechanics and Machinery Question Bank Fluid Mechanics

  • question_answer Using the Prandtl's mixing length concept, how is the turbulent shear stress expressed?

    A) \[\rho l\,\overline{\frac{du}{dy}}\]                      

    B) \[\rho {{l}^{2}}\,\overline{\frac{du}{dy}}\]

    C) \[\rho l\,{{\left( \overline{\frac{du}{dy}} \right)}^{2}}\]               

    D) \[\rho {{l}^{2}}\,{{\left( \overline{\frac{du}{dy}} \right)}^{2}}\]

    Correct Answer: D

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