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 denotes the boundary layer thickness. Which of the
following statements is correct? (A) the mass flux across bc equals , (B) the mass flux across ab equals ,
(C) the mass flux across cd equals , (D) the mass flux across bc equals
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, here 
denotes the boundary layer thickness. Which of the
following statements is correct? 
, 
,
, 