複選題44、 The boundary layer flow over a flat plate with zero pressure gradients is shown in Figure 44.
The control volume is defined as dashed line a-b-c-d and the depth is defined as w. Ahead of
the plate the velocity is uniform, U. The velocity distribution across cd is approximated by
, here δ(x) denotes the boundary layer thickness. Which of the
following statements is correct?
(A) the mass flux across bc equals
/5,
(B) the mass flux across ab equals -
,
(C) the mass flux across cd equals
2
/3 ,
(D) the mass flux across bc equals
/3.
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