question_answer

Which one of the following is the expression for momentum thickness \[\theta \] of a boundary layer?

A) \[\theta ={{\int\limits_{0}^{\delta }{\left[ 1-\frac{U}{{{U}_{0}}} \right]}}^{2}}\,dy\]

B) \[\theta ={{\int\limits_{0}^{\delta }{\left[ 1-\frac{U}{{{U}_{0}}} \right]}}^{2}}\,dy\]

C) \[\theta =\int\limits_{0}^{\delta }{\,\frac{U}{{{U}_{0}}}\left[ 1-\frac{U}{{{U}_{0}}} \right]}\,\,dy\]

D) \[\theta =\int\limits_{0}^{\delta }{\,\frac{U}{{{U}_{0}}}\left[ 1-\,{{\left( \frac{U}{{{U}_{0}}} \right)}^{2}} \right]}\,\,dy\]