
366 Heat Transfer: Thermal Management of Electronics
Let’s examine the use of this method by obtaining the nite-difference form of
the x-momentum equation (i.e., ϕ = U). Figure 14.5 shows a typical two-dimensional
control volume for U velocity. Let’s assign the letter P for the node located at the cen-
ter of this control-volume (i.e., the node for which we will obtain the nite- difference
equation) and letters W, E, N, and S for the nodes on the immediate left, right, top,
and bottom of this node, respectively. Let’s also assign small letters w, e, n, and s
to the centers of the left, right, top, and bottom sides of the control volume, ...