1. Consider steady flow from left to right through the expanding duct below. The duct has variable height H as shown ( K is a constant) and uniform depth B into the page. As a reminder, the material derivative is: DtD=t+(v) where the first term is the temporal component and the second the convective, or spatial, component. Further, in Cartesian coordinates, the material derivative is: DtD=t+ux+vy+wz For the questions below, consider just the centerline velocity, vcl. a. What is the vector expression for vcl ? b. What is the temporal component of acceleration? c. What is the convective component of acceleration? d. What is the total acceleration? Is it positive or negative? Why