Configuration leads to the lowest temperature

1. Find out which of the follow configuration leads to the lowest temperature on the fins:
a. The air inlet is on the top of the box and four side boundaries are outlet boundaries as
shown in Figure 1.
b. One side is a wall with the 80mm-diameter circular air inlet (same size as the inlet in
Figure 1) and the opposite side is the outlet. The rest two sides are solid walls and top
surface is solid wall. Income airflow is in the horizontal direction.
c. One side is a wall with the 80mm-diameter circular air inlet (same size as the inlet in
Figure 1) and air flows through the rest three sides. The rest three sides are outlet
boundaries and the top surface is solid wall.
d. One side is a wall with the 80mm-diameter circular air inlet (same size as the inlet in
Figure 1) and air flows through the rest three sides and top surface. The rest three
sides are outlet boundaries and the top surface is outlet boundaries (open).